The TX-SR604 delivers an enveloping surround sound experience for all your entertainment sources. This receiver boasts advanced surround processing and 90 watts of clean Onkyo power for up to seven of your home theater speakers. Beefy construction ensures that your home theater sound stays pure, powerful, and dynamic at all times. And features like HDMI switching and XM Radio capability keep you on the cutting edge of digital entertainment.

Advanced auto setup tailors sound to your room
For the most accurate home theater sound possible, the 'SR604 includes Audyssey 2EQ, a sophisticated speaker calibration system from Audyssey Laboratories. Using the included microphone, the receiver analyzes sound from two different listening positions, then automatically adjusts level, equalization, and delay settings for each of your speakers. You'll get clear, precise, natural sound that's optimized for your room.

XM Satellite Radio compatibility
The 'SR604 lets you enjoy XM Satellite Radio at home through your best speakers. Once you've added an optional XM Mini-Tuner package and activated your XM subscription, you'll have access to more than 170 channels of music, sports, talk, and more. Plus, it's compatible with XM's new HD Surround channels, which deliver music in multichannel sound. You can even view channel, artist, and song information on your TV and change channels using the 'SR604's remote.

iPod® integration
Add Onkyo's optional DS-A2 control dock to enjoy listening to tunes on your iPod through your stereo system. The DS-A2 features a video output that lets you view your iPod's photos and videos on a TV. Plus you can use the receiver's remote to control your player while it's docked.

Convenient video connection options
This receiver boasts advanced digital video switching, too. It lets you hook up two high-resolution video components via HDMI — a digital connection available on many HDTV tuners and high-end DVD players that helps maintain optimum picture quality. Plus, component video conversion allows you to route all of your analog video sources to your TV using only one component video connection. This simplifies hookup, streamlines switching, and maintains the best picture for every analog video source in your system.

Multi-room audio and more
Dual-room/dual-source capability lets you enjoy home theater in your main room while a housemate enjoys music in another room. The 'SR604 can even power a pair of stereo speakers in your second room. You also get a multibrand remote for controlling your other components, and an on-screen display that lets you view the receiver's menus and settings on your TV.

Learn about the ins and outs of HDMI connections at
Shop our selection of HDMI cables.

Product Highlights:

  • 90 watts x 7 into 8 ohms (20-20,000 Hz) at 0.08% THD
  • Dolby® Digital EX, DTS-ES®, Pro Logic® IIx, and DTS Neo:6 decoding
  • 1080p-compatible HDMI switching (2 in, 1 out)
  • HDMI version 1.1
  • XM Satellite Radio Ready (requires XM subscription and optional XM Mini-Tuner package)
  • Neural Surround™ decoder for XM's HD Surround channels
  • iPod compatible with optional Onkyo DS-A2 iPod dock
  • Audyssey 2EQ auto speaker setup (microphone included)
  • dual-room/dual-source audio (powered and fixed line-level stereo audio output for 2nd room; using powered 2nd-room output allows 5.1 home theater in main room)
  • component video conversion
  • 192kHz/24-bit DACs for all channels
  • multibrand remote
  • component video switching: 3 in, 1 out (50MHz bandwidth)
  • digital inputs: 4 optical (including 1 front-panel), 2 coaxial
  • optical digital output
  • 7.1-channel analog audio preamp input
  • 5 audio/video (including 5 S-video and 1 front-panel) inputs
  • 2 audio inputs
  • no phono input
  • on-screen display (requires TV with direct video input)
  • 40 AM/FM/XM presets
  • Wide Range Amplifier Technology
  • aluminum front panel
  • oversized power transformer, filter capacitors and heat sinks
  • 1 pair of main speaker outputs
  • sleep timer
  • 17-1/8"W x 6-7/8"H x 15-1/2"D
  • warranty: 2 years
  • Our 60-day money-back guarantee

Receivers: Your ticket to sensational sound

Your receiver powers your speakers and lets you connect and select your entertainment sources. But a great receiver does a lot more — it ignites your emotions. From the passion of a favorite musical artist, to the crossfire of a super-charged movie soundtrack, to the intensity and immersion of a fast-paced video game, your receiver is the key to experiencing and enjoying it in full.

Onkyo TX-SR604 Reviews

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Onkyo TX-SR604

Written By Mike, Augusta, Ks on Monday, June 11, 2007

my rear speakers came to life with this unit. best price/features for money. I am not fond of the speaker connectors but they worked. auto setp worked perfect. there are several 7.1 sound fields to choose from.


Written By Stephen, Tampa, FL on Saturday, May 12, 2007

Crutchfield Customer Review (What's this?)

Purchased this receiver to go with my new TV. The HDMI switching works well although I only have 1 in and 1 out so far. The feature list is more than I need for all of my components. Took me a few hours to get all of the settings right. Crutchfield tech support was helpfull as always getting my 5.1 speakers configured correctly. The one thing to note is that this thing runs a bit hot. I had to install it in a small a/v cabinet and after it had been on for a few hours the bottom of the DVD player that is on top of it was probably 130 degrees or so. So I re-adjusted the shelf to a higher placement and I leave the door open while it is on. I have a DC case fan on order and plan to rig a makeshift cooling fan to the back of my cabinet.
If you're not an audiophile and you just need a good qualtiy receiver that will keep you in business for the upgrades to come, this is it. Onkyo is reliable and sounds great.

Great Receiver

Written By Daniel, Lawrence, Kansas on Monday, April 16, 2007

Crutchfield Customer Review (What's this?)

I wanted to get a new receiver after my existing Onkyo SR500 just couldn't keep up with the upgrades in equipment since I got it about 5 years ago (although I'll still be using it in another room). I wanted my new receiver to be a one cord option to the tv and to process HD like a charm.

I've tested the TX-SR604 on digital cable and DirecTV, both with HD. It has performed very well with both setups. I'm only running component cables right now and it is flawlessly switching between my gear with component connections and converting an S-Video connection from my PS2 - all with one component cable to my HD tv. I didn't go with the TX-SR804, with it's HDMI conversion, because the 604 was a cheaper option and because by the end of this year I'll be running only two HDMI connections through the 604 with DirecTV and a PS3. I will, for the near future, only need HDMI switching and not conversion.

Audio sounds great. I like the large amount of listening modes and the easy ability to switch between them using the remote. The radio tuner works well too. Setup isn't too difficult. Assigning audio and video inputs was intuitive and made easier with the on-screen setup menu.

This is a great receiver. It's the second Onkyo receiver I've owned. I also highly recommend Crutchfield. Their service has been great with every piece of equipment I've purchased from them over the years.

great bang for the buck

Written By Mark, charlotte,nc on Saturday, March 24, 2007

Crutchfield Customer Review (What's this?)

Have recently decided to do an upgrade to my home theater. I bought this amp based on the reviews and I haven't been disappointed. Even my wife who is generally blase about my theater stuff noticed an improvement. The auto set-up worked to a T for me and was quick and easy. I have the amp hooked up to infinity primus tower speakers and surrounds and the quality is fantastic. I'm sure more money would be even better but for what I have invested I am extremely satisfied!!! The clarity and volume are great!! And finally I must commend crutchfields on being the best!!! They truly are a committed group, going way above and beyond in the area of customer service. If you have any doubt about ordering from them...don't. They are top notch in every aspect. The greatest thing is they are always there for you. I had a question at 11:30 at night and a quick phone call , I got the answer

Coming into the 21st century

Written By Bill, Roaring Branch, PA on Monday, March 12, 2007

After 13 years, my Sony receiver gave up the ghost, as they say. I got online and researched receivers which would provide Prologic II 7.1 channel surround sound, as well as handle all my components. I chose the Onkyo for its features, appearance, and HDMI connectivity. All I can say is fantastic! I have a medium-sized room, and its 90 watts of power is more than enough. The only thing I recommend is not using the audyssey microphone for set-up. It worked much better for me by setting all speakers to 0 and tweaking it to my liking. I have never had an Onkyo component before and would highly recommend this to anyone. For the price, performance, and ease of set-up, I say "fantastic!" Also, for guidance and hints, Conrad at Crutchfield tech support was extremely helpful, respectful, and understanding. Crutchfield forever!

All You Really Need

Written By Mark, Tempe, Arizona....but it's a DRY heat! on Thursday, March 08, 2007

Crutchfield Customer Review (What's this?)

Ive had this receiver for a little more than a month now and cannot believe my good fortune. The unit replaced my old Yamaha HTR-5590; and, as good as that unit was, this receiver blows it into the weeds. I have been wanting to do a modestly-priced upgrade to my system for a long time. As such, I was reading all the publications and noted the very positive things they all had to say about the Audyssey2 EQ on the 674 model a half-step up from this one. As I didnt need upconversion (HDMI only now), I got this one and have been simply astounded.
The Autosetup routine is very, very easy and self-explanatory. What I really didnt expect were the results! While I concur that the Auto EQ is a bit hot on the low end from the subwoofer, the program and the receiver have breathed new life into my old speakers (JBL system: towers in front, substantial center, 12" subwoofer and dipole/diffuse surrounds). We currently live in an apartment and the sound is now rich and full without being neighbor-irritating. Better yet, I can hear explosions and whispering equally well. Really unbelievable how much my soundstage has been refined and expanded.
Keith was my sales advisor and was The Best! Started with an online chat (transcript of which was promptly sent to me); then a series of phone calls. He even got me the lowest sale price! Fantastic. I have now purchased the Logitech Wireless DJ and this receiver from Crutchfield and I am a customer for life. Great prices, shipping, and unbeatable human support - Onkyo and Crutchfield have a new customer for

Great AVR

Written By WayneC, Tampa, FL on Wednesday, February 07, 2007

Crutchfield Customer Review (What's this?)

Pros: Easy to setup, EQ program works pretty well, powerful, zone b, HDMI switching, great sound, great price for all the features it offers

Cons: it runs a bit warm, do not use in an enclosed cabinet

intimidated at first; satisfied in the end

Written By speedy_zx3, CA on Tuesday, February 06, 2007

Crutchfield Customer Review (What's this?)

first time experience with a receiver with this many options. even with my knowledge of things, I was a bit nervous at first. I was suprised, though, at how easy it is setup and use. Once everything was plugged in, I ran the auto audio setup and let it do its' thing...

the receiver is paired with Infinity TSS-1100's, and I don't think I could be much happier (especially when I got everything for less than $1k).

More bang for your buck.

Written By eric, Lynchburg, VA on Thursday, February 01, 2007

First and foremost, the Onkyo TX-SR604 was by far the cheapest price I could find for a descent reliable reciever that had HDMI capabilities. I run my DISH Satelite, and HDMI Upconvert DVD player and my Sony PS3 through this reciever...Although it only has two "input" slots, I use a very cheap monoprice HDMI(HS-201) switcher to supply two of my components into one slot while my PS3 has its own slot, works like a charm! The setup was super easy. Sound quality is amazing, especially watching Blue-Ray movies in Uncompressed HDMI Audio!!! WOW. I thought sound through a Toslink cable was great, HDMI blows it out of the water. I think the next model up "upconverts" any signal into HDMI, unfortunately the 604 does not....but Im not all too concerned as my components are all in HDMI anyways. All in all, this is a great product, and for the money I dont think you can beat it. This was my first Onkyo purchase, and I am %100 satisfied.

Onkyo TX-SR604

Written By czcon1, Albany, NY on Wednesday, January 31, 2007

Crutchfield Customer Review (What's this?)

I did alot of research looking for the functions I need in a nice mid range receiver. I picked this one for ease of setting up, the included Mic. works good. I also needed HDMI inputs. The only thing I'm disappointed in this receiver is that it has to be on in order for the HDMI to pass through, not a big deal. I also have the Infinity 1100,s hooked up and it souds great this receiver comes a long way from my last receiver.

Nice Entry Level Reciever

Written By Jeff, Richland WA. on Monday, January 29, 2007

Crutchfield Customer Review (What's this?)

For the money the TX-SR604 is a nice A/V Reviever. The sound quality is good, and the features are more than most will ever need. The DSP fields are done right, and power is adequate. The HDMI connectivity was a big reason I bought this reciever, however, even with hours on the phone with the excellent Crutchfield techs, the Onkyo techs, the VISIO techs, and the Dish Network techs, I was never able to get the HDMI switching through the reciever to work consistently. There are still lots of issues with HDMI and component compatability. I ended up having to run the HDMI direct to the VISIO TV from the Dish reciever, and the DVD player, and run a seperate optical from the components to the reciever. Not a big deal, but not what I bought an HDMI capable reciever for. Also was never able to get the new Dish HD reciever remote control to control the Onkyo.

Onkyo Receivers - Perfect Unit

Written By Jon, Minnesota on Saturday, January 13, 2007

Crutchfield Customer Review (What's this?)

I bought this about a month ago and have had no problems at all with this unit. It replaced a 5.1 Ready Sony receiver.

The power output is clean and I like the fact it has 2 HDMI inputs. I don't use HDMI yet, but I will once I get a newer HD TV. Lots of inputs and the setup was a breeze. Using the provided microphone, this receiver setup all of my speakers on it's own. I thought I'd have to tweak it but it actually set it up perfectly. I could not make any changes to improve the sound. I am running the Infinity 1100 5.1 speaker setup right now and am not using the other 2 side channels, but it's nice to have the option in the future once I have a larger living room to use the extra speakers.

Loud, clean sounding Home Receiver. I'll always buy Onkyo receivers from now on. No comparison to my old Sony. The multibrand remote programmed easily to be able to use my DVD player. Easy to use remote and easy to understand Home Receiver. It's perfect.

Very Pleased

Written By Andrew, East Peoria, IL on Monday, December 11, 2006

I have never owned a piece of equipment like this, so I really don't know what to compare it to. I was impressed right away with how crisp and clear my CDs sounded. I have some older DCM floor speakers that sound better than ever with this receiver. I was a little dissapointed with the surround sound at first, but then I got the microphone out and ran the auto setup. It was like I flipped a switch and the system sprang to life. The surround sound is great. I have Polk Audio satellite speakers mounted on the side walls and two in-ceiling Polk Audio speakers mounted in the rear behind the couch. I also have a Pold Audio center channel and powered sub. My living room is 22x24 and it sound great.
The auto setup could not be any easier and the system setup overall is very easy. I run everything to the receiver and run one set of component wires to the tv. Excellent picture and sound. If you aren't concerned with THX and want great sound buy this receiver.

Sounds great, easy to set up and use!

Written By Tom, Spokane, WA on Tuesday, November 28, 2006

Crutchfield Customer Review (What's this?)

Great receiver all the way around. I'm using it as the heart of a home theater system (DVD recorder in via HDMI, out via HDMI to HDTV, and powering Infinity TSS-1100 5.1 speakers). Sounds great, looks great, and is very easy to set up. Owner's manual is very clearly written. Assigning digitial inputs is a breeze and, as noted by another reviewer, the Audyssey EQ is easy to use (note: the audio set-up mic has two click stops on its way in. Be sure to push it all the way in or else you'll get error messages and a few moments of headscratching). The HDMI switching is really handy too. If you have older, non-HDMI components, however, you might want 604's big brother, the 674, which will upconvert non-HDMI signals to HDMI, thus simplifying the installation. However, if you're starting from scratch and all your components have HDMI outs you don't need to spend the extra $200. And yes, the 604 requires a separate composite video cable to display its menu on the TV. Absolutely no big deal. You'll hardly ever need the menu after initial set-up anyway. Finally, programming the 604's remote to operate other components is really easy as well.

great receiver with HDMI for its price

Written By MCR, Mayaguez, Puerto Rico on Wednesday, November 01, 2006

I got this receiver to power a couple of 200 watts Bose speakers and a set of small surround speakers. The Onkyo is couple to a HDMI DVD via the receiver's HDMI input and from there to a HDMI-HDTV. The Dish antena receiver is hooked up optically to the receiver. ONLY TWO CABLES!! It sounds great. The microphone setup worked out quickly and fairly accurate - we used our hands just a little bit to customized the settings. Once again, the sound from the receiver using eihter HDMI or the optical inputs is great - very well defined in the 20 x 20 room. Now we plan to add as set of 201 or 301 to our terraza for zone 2 listenning. The Onkyo's remote can control our Panasonic HDTV and HD DVD and dish receiver. This is a highly recommended receiver.

Onkyo TX-SR604

Written By Chris, Greensboro, NC on Saturday, October 28, 2006

Crutchfield Customer Review (What's this?)

This is the first Onkyo product I have owned, and thus far I am exceptionally happy with it. I primarily purchased this device for the HDMI switching capabilities, and in that regard it seems to perform quite well, without any noticable degredation in quality. I am generally skeptical of devices that claim to automatically adjust speaker settings with an included microphone, but after running the Audyssey setup routine, I was shocked at how well it worked. It was the easiest receiver setup I have ever experienced. The unit itself is solid and looks like it means business. The sound quality is exceptional; I actually like it better than the Denon I am replacing. Part of that could be to the Audyssey setup, but it is a quite clean sound regardless, with great spatial qualities. The fact that it is XM ready is pretty neat, but I doubt I will use it. As other reviewers have mentioned, it does not diplay an on-screen setup via HDMI, but it is easily fixed by running a cheap composite connection, and you shouldn't need it much anyway. It has a nice instruction manual that in my mind, left no questions unanswered. Overall, I would highly recommend this receiver. For the price point, you can't really get into HDMI switching any cheaper while still maintaining the ownership of a trusted brand and high-end features.

Looks sharp, Sounds great

Written By Scott, Lehi, UT on Sunday, October 01, 2006

Crutchfield Customer Review (What's this?)

I bought this to replace the Sony receiver I've had for many years and I wanted to upgrade to one that would manage component video. I purchased the silver model to match with my newer equipment and it looks great. The setup was easy, especially with the self-training microphone. The power and sound is smooth and clean. I've also noticed a much better response in my rear surround speakers since installing this receiver.
The only grief it has given me is the codes for the remote won't control my Sony 300-disk CD changer at all and a few functions on my Toshiba TV don't react quite right making it so I can't control some of the settings without using the TV's own remote.
Overall, it is proving to be a good choice for an upgrade for me.

Great Value for HDMI Switching

Written By Donald, Blacksburg, VA on Sunday, September 24, 2006

Crutchfield Customer Review (What's this?)

Bought this receiver to power Polk 70 monitors. It's a great value for HDMI switching which is the main reason I bought it. However, I'm a little disappointed that you can't view the on screen menus via HDMI, including volume on the TV screen. You can do it with other hook-ups though (such as component). If you use HDMI, you'll have to hook up a temp. video cable through S-video or RCA to navigate through the menus. A little ironic though b/c I think most will buy this for the HDMI feature. From what I can tell, this is a limitation with most receivers. Very pleased overall with the product...Fairly easy to use and understand. Overall, it's a great value with a lot of features. True Audiophiles will probably go the next level with THX, but this one is hard to beat for someone who wants very good quality without taking out a second mortgage.

Price Clarity Power Nice

Written By Brian, Surprise, AZ on Tuesday, September 19, 2006

Very surprised with this receiver. HDMI switching, and audio processing from this connection is flawless from HD Sat,HDMI DVD to Plasma Screen [720p native]. Auto Eq worked very well, with only minor adjustments to tweek speakers in an 18 x 24 room. The Onkyo is driving my old AR-3's in the front, and assorted Infinity's with clarity and headroom to spare.
OSD thru non hmdi connection. Audio/Video sync control nice. Good manual for a read is a must for assigning vid's, digital inputs, and advanced features, with and without remote. Universal remote adequate, all my non-Onkyo components operative. I listen to alot of Stereo so VLSC on the fronts only is not a problem. No up conversion thru HDMI, S-vid to Component only [see 674]. Clarity, power, and multiple control features has made another Onkyo Convert. For me this one cable to monitor soluton makes this unit a Great Buy for the Bucks.

Good price, enough power and HDMI connection.

Written By jeroq, Beaumont, CA on Tuesday, August 22, 2006

Crutchfield Customer Review (What's this?)

This receiver is a great addition to my HTS. It has ample power and with HDMI connection for its price, unfortunately analog connection does not output to hdmi. OSD also has to be done thru analog and not thru HDMI unless you go with the step up model of TX-SR674. This receiver replaced my Pioneer VSX-1014TX-K and its sound output is not even comparable to Onkyo's, sticking with Onkyo from now on.

Hands-on research

What's in the box?

Download owner's manual

  • Black AM/FM/Dolby Digital/DTS receiver
  • Wireless remote control (RC-651M)
  • 2 "AA" batteries
  • AM loop antenna
  • FM wire antenna (with push-on "F" connector)
  • Speaker setup microphone with attached 19.75' cable (3.5mm mono miniplug terminal)
  • Plastic speaker terminal wrench
  • Instruction Manual (English)
  • Instruction Manual (French/Spanish)
  • Remote control code chart
  • Errata sheet
  • Product Registration/Warranty Card
  • Interactive iPod dock information
  • XM Radio Connect & Play information
  • Sheet of self-adhesive cable labels
  • "Caution!" sheet (concerning speaker terminals)

Product Research

Remote Control
Input and Output Notes


WRAT (Wide Range Amplifier Technology): This technology uses low-negative-feedback circuit topology for accurate signal reproduction, improved dynamic signal-to-noise ratio, and better delivery of power peaks.

Vector Linear Shaping Circuitry (VLSC): Onkyo's proprietary VLSC significantly reduces pulse noise from digital signals during the digital-to-analog conversion process to assure the signals are delivered in all their purity. This adds more depth and clarity to all your music sources (including digital music files) and movie soundtracks, and faithfully reproduces the acoustic detail and subtle nuances of all your audio sources. On the TX-SR604, the VLSC is used on the front left and right channels.

On-Screen Display (OSD): An OSD can be displayed on your television for easy system setup. The arrow and enter buttons on the remote allow you to navigate through the menus to select and set items. The OSD is passed through the composite video, S-video, and component video monitor outputs.

HDMI Switching: The TX-SR604 has two HDMI inputs and one HDMI output for connecting DVD players, HDTV set-top boxes, and other video components to your TV or projector. A single HDMI cable carries digital video and audio signals. The HDMI inputs are compatible with DVI, so TVs and displays with a DVI input can be connected by using an HDMI-to-DVI adapter cable, along with audio cables. The receiver uses HDCP (High-bandwidth Digital Content Protection), so only HDCP-compatible components can display the picture. The HDMI inputs can accept and switch 480i, 480p, 720p, 1080i, and 1080p signals to a TV, monitor, or projector.

Component Video Switching: In addition to HDMI, composite and S-Video switching, this unit can switch between high resolution component video sources. There are 3 component video inputs and 1 component video output; each input and output has jacks labeled "Y", "Pb" and "Pr". The component video inputs and outputs have a bandwidth of 5Hz to 50MHz.

Digital-to-Analog Converters (DACs): To decode and playback high-resolution recordings, this receiver is equipped with 192kHz/24-bit DACs.

Automatic Speaker Setup: With the supplied speaker setup microphone, the Audyssey 2EQ Automatic Speaker Setup function can measure and correct the room acoustics in your listening room. The speaker setup function measures the test tone output by each speaker and automatically determine the number of speakers connected, their sizes, crossover frequencies, and the distance from each speaker to the listening position. The supplied microphone is approximately 2" in diameter, 3/4" tall, and has a 20' cable that plugs into the front of the receiver. There is a threaded insert on the bottom of the microphone so it can be mounted on a tripod for accurate listening position placement. If you wish to setup the speakers manually, you can follow the procedure for Speaker Configuration.

Speaker Distance: The distance from your listening position to each speaker can also be set manually. The front speaker distance can be set from 1 to 30 feet in 1-foot increments. The center and subwoofer settings can be up to 5 feet more or 5 feet less than the distance you set for the front speakers. The settings for the surround left, surround right, surround back left, and surround back right speakers are each individually adjustable, and they may be up to 5 feet more or 15 feet less than the distance you set for the front speakers.

Speaker Levels: You can manually adjust the level of individual speakers during playback between -12dB and +12dB, and -15dB to +12dB for the subwoofer. These adjustments are temporary, and will be canceled when the receiver is turned off.

Double Bass: You can enhance the bass output by activating the Double Bass function. This function allows you to feed bass frequencies to the front left and right channels and to the subwoofer. Double Bass can be set only when the subwoofer is set to On, and the front speakers are set to Full Band.

Adjustable Crossover: This receiver has a built-in high-pass crossover for the speaker system. This setting is available when you tell the receiver that there is a subwoofer being used. The frequencies that you can choose from are: Full Band, 40, 50, 60, 80, 100, 120, 150, and 200 Hz. Frequencies lower than the set crossover point are output by the subwoofer.

Equalizer: The built-in EQ can be set automatically using the Auto Speaker Setup or it can be set manually. Each channel is individually adjusted. Each full range channel (front, center, surround, and surround back) has five EQ bands; 80 Hz, 250 Hz, 800 Hz, 2.5 kHz, and 8 kHz. The range of adjustment runs from -6 dB to +6 dB in 1 dB increments.

XM Ready: Using an optional XM Mini Tuner, a Mini Tuner Home Dock, and an XM subscription, you can take advantage of the variety and sound quality of XM Satellite radio. XM offers over 170 digital channels of music, news, sports, and talk radio and even has weather and traffic information in several major markets. The channel number, channel name, artist name, and song title are listed on the TX-SR604's display and on the connected TV monitor. XM stations are stored as presets and recalled in the same way as AM and FM stations.

iPod Compatible: The DS-A1 or DS-A2 Remote Interactive Dock for iPod (item #'s 580DSA1 and 580DSA2) provide an interface between an iPod digital media player and Onkyo TX-SR604. Once the iPod is docked you can control basic functions such as volume control, play, stop, and skip via the Onkyo system's RI-compatible wireless remote control. The dock also charges the battery in the iPod, and allows you to view digital photos and video on an Onkyo home theater system.

Assignable Digital Inputs: The TX-SR604 has 6 assignable digital inputs (4 optical/2 coaxial) allowing you to specify which input source is connected to which digital input jack.

Multi-Channel Input: The receiver is equipped with a 7.1 multi-channel input for compatibility with external decoders or high resolution audio players such as DVD-Audio or SACD. The input consists of left front, right front, center, subwoofer, left surround, right surround, left surround back and right surround back RCA inputs.

Direct Mode: This mode delivers pure sound with minimum sound quality adjustment and filtration. The sound recorded for the right and left front channels is output to the right and left front speakers only and not output to the subwoofer or rear speakers.

Zone 2 Output: This feature allows you to enjoy one source in your main listening room, while another source plays in a remote room. Depending on how you configure the receiver, using the dual zone feature will require an amplifier and speakers, a set of powered speakers, or simply a set of non-powered speakers located in a remote location. You can connect the dedicated Zone 2 stereo RCA line outputs to a receiver/amplifier or powered speakers in a remote room while powering a 7.1-channel speaker system in the main room; the output level of the RCA line outs is fixed, so they must be connected to an amplifier or powered speakers equipped with a volume control. You can also connect a pair of speakers to the receiver's dedicated Zone 2 speaker terminals, and still power a 5.1-channel speaker system in the main room. When the Zone 2 speaker terminals are turned on, the Surround Back speaker outputs do not work. When the Zone 2 speaker terminals are off, the Surround Back speakers outputs work as normal. The Zone 2 speaker output volume setting can be controlled with the remote.

Listening Modes: This receiver incorporates a wide variety of listening modes to bring you maximum enjoyment from your audio and video software. The listening modes include:

  • Direct: audio from the input source is output directly with minimal processing
  • Stereo: sound is output from the front left and right speakers and subwoofer
  • Mono: sound is output from the front left and right speakers and subwoofer
  • Multi-channel (7.1-channel input)
  • Dolby Pro Logic II: expands any 2-channel source to 5.1 channels
    • Movie
    • Music
  • Dolby Pro Logic IIx: expands any 2-channel source to 7.1 channels
    • Movie
    • Music
    • Game
  • Dolby Digital
  • Dolby Digital EX: expands 5.1-channel Dolby Digital and DTS sources to 6.1 or 7.1-channels
  • DTS
  • DTS 96/24
  • DTS-ES
    • Discrete
    • Matrix
  • DTS Neo:6: expands any 2-channel source to 6.1-channels
    • Cinema
    • Music
  • Neural Surround: surround technology developed for music and adopted by XM Satellite Radio for broadcasts of surround recordings and live events in surround sound.
  • Onkyo Original DSP Modes
    • Orchestra: for classical or operatic music
    • Unplugged: for acoustic instruments, vocals, and jazz
    • Studio-Mix: suitable for rock or pop
    • TV Logic: adds realistic acoustics to TV shows
    • Mono Movie: suitable for old movies and other mono sources
    • All Ch Stereo: ideal for background music
    • Full Mono: all speakers output the same sound in mono

Assigning Listening Modes: You can assign a default listening mode to each input source that will be selected automatically when you select that source.

CinemaFilter: Using the CinemaFilter you soften overly bright movie soundtracks. Movie soundtracks are typically mixed for a large theater (relative to your home theater) with lots of soft seats and thick curtains on the walls. Home theater settings often lack these high frequency absorbing wall treatments making the soundtrack sound too bright. CinemaFilter accounts for this and for many movies sounds more natural at home.

Late Night Feature: The Late Night feature limits the dynamic range of Dolby Digital recordings. Limiting the dynamic range makes it easier to find a volume that ensures the quiet sounds are not too quiet and the loud sounds are not too loud for night time listening. This allows you to comfortably listen to without the need to constantly adjust the volume to keep from waking family/neighbors. The choices are: Off, Low, and High.

Note: This feature only works with Dolby Digital Encoded software and the depth of the feature will vary based on the individual software package.

IntelliVolume Setup: The IntelliVolume setup function allows you set a volume correction value in the range of -12dB to +12dB, in 1dB increments, for each source to prevent large jumps in volume when switching from one source to another. This feature eliminates the inconvenience of manually readjusting the volume control each time you switch from a source with a weak signal to a source with a b signal and vice versa.

Volume Setup: The receiver volume can be configured in the following ways:

  • Maximum Volume: You can prevent the volume from being set too high by specifying a maximum level: 50-99.
  • Power On Volume: You can specify the volume setting each time the receiver is turned on from 1 (minimum) to 99, MAX, or Last to use the same level that was used when the receiver was turned off.

Sleep Function: From the remote, you can set the unit to automatically turn off after as much as 90 minutes or as little as 10 minutes; choices are presented in 10 minute increments.

Display Dimmer: The display illumination includes the green alphanumeric display and a blue ring around the volume knob. You can dim the display as follows: Normal + Volume light on, Normal + Volume light off, Dim + Volume light off, and Dimmer + Volume light off.

Remote Control

Multi-brand Remote: The supplied RC-651M wireless remote is a multi-brand remote. The remote is pre-programmed to operate Onkyo components, as well as other popular brands of equipment, including DVD players, satellite receivers, cable boxes, VCRs, and televisions.

Input and Output Notes

Multi-channel Input: The TX-SR604 has a multi-channel input for connecting a DVD player, a high resolution audio player (such as a DVD-Audio or SACD player), or an external decoder. The input consists of left front, right front, center, subwoofer, left surround, right surround, left surround back and right surround back RCA inputs. You can connect a component using only left and right audio jacks, if desired. In addition, there are composite and S-video jacks for this input. Note: The DVD input is included in the total of 7 A/V inputs.

Headphone Output: This receiver has a standard 1/4" headphone output on the front panel. The speaker outputs, except for the Zone 2 speakers, are muted when headphones are plugged in.

Speaker Outputs: There are color-coded binding post connectors for the left front, right front, center, left surround, right surround, left surround back, and right surround back speakers. The binding posts are not 5-way because a plastic collar prevents their use with spade lugs. The Zone 2 speaker terminals are also binding post connectors.

IR Input: The IR input jack allows you to control the receiver without line-of-sight access by purchasing an optional IR remote control system and locating the remote sensor in sight. This offers control from Zone 2, or when the receiver is located in a closed cabinet.

RI Remote Control Jack: The 1/8" RI remote control jack allows you to connect this receiver to compatible Onkyo components.

12 Volt Trigger: This 1/8" mini-jack output can be connected to the 12-volt trigger input on a power amplifier in Zone 2. When Zone 2 is turned on, a 12-volt/100 milliamp (max) trigger signal is output.

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