Harman Kardon HK 3770

Stereo receiver with networking and Bluetooth®

Item #: 532HK3770

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34 Reviews

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Modern connectivity, backed by classic sound

When you want your music to sound its best, you just can't beat a good two-channel stereo. Connect your speakers to the Harman Kardon HK 3770 and this powerful receiver will bring those tunes to life the way they were meant to be heard. Whether you're listening to songs from a CD, turntable, networked computer, or a smartphone, this receiver has the connectivity to play them and the brawn to bring out their dynamics and detail. Digital inputs even allow it to improve the sound of TVs and streaming media players like Apple TV®, too. With so much versatility, this receiver goes above and beyond old-school models, while retaining classic Harman Kardon sound.

Clean sound from a new "green" technology

Harman Kardon has been working to make their receivers more energy efficient without compromising sound quality. The HK 3770 represents the fruits of their labor. It utilizes Harman Kardon's GreenEdge™ technology. Rather than redesigning the high-current Class AB amplification stage, this receiver features a new digital power supply. Unlike conventional analog power supplies, this new digital design uses less energy, fewer raw materials, and produces less heat. The result is a lightweight, efficient, eco-friendly receiver that delivers the same sonic benefits we've come to expect from this audio innovator.

Enjoy wireless music from smartphones, tablets, and computers

The HK 3770 offers two ways to stream music wirelessly. Built-in Bluetooth lets you stream tunes from a smartphone, tablet, and even some computers without a home network. It's the easiest way to enjoy your digital music collection with room-filling sound. If you have a large digital collection stored on a networked computer or NAS, the HK 3770 is Internet-ready. Connect it to your network router and stream music from your computer over your wireless home network. You can also listen to thousands of free Internet radio streams from stations around the world, going far beyond the reach of the built-in AM/FM tuner. Download the free Harman Kardon remote app to your iOS® or Android™ device and use it to control the receiver. App control requires a wireless home network and a wired connection between your receiver and your network router.

Connect your iPhone or USB thumb drive

The USB port on the HK 3770's front panel lets you plug in your iPhone®, iPod®, or iPad® to listen to music. This connection bypasses the device's digital-to-analog converters in favor of the receiver's high-performance DACs. That means you'll get smoother sound with more detail than your iPhone can deliver on its own. You can also use the receiver's remote to control playback with connected Apple® devices. The USB port is also great for playing digital music files on thumb drives by popping them into the USB port.

Product Highlights:

  • 120 watts x 2 (stereo) into 8 ohms (20-20,000 Hz) at less than 0.07% THD
  • GreenEdge technology combines an energy-efficient, lightweight digital power supply with standard Class AB amplification
  • Internet-ready for listening to music from a networked PC
    • stream music from a DLNA-compatible PC or network-attached storage (NAS) device
    • built-in support for listening to free Internet radio station streams with vTuner
  • built-in Bluetooth for wirelessly streaming music and audio from compatible smartphones, tablets, and computers
  • 24-bit/192kHz digital-to-analog converters
  • free Harman Kardon Remote app lets you use your Apple or Android device as a Wi-Fi® remote
  • front-panel USB port for connecting an iPhone, iPad, iPod, or playing music from a thumb drive (WAV, MP3, WMA)
  • 6 pairs of RCA stereo inputs, including phono input (MM)
  • digital inputs: 2 optical, 1 coaxial
  • preamp output for a powered subwoofer
  • stereo RCA outputs for recording
  • A/B speaker switching
  • binding post connectors for two pairs of speakers
  • 1/4" headphone jack
  • Ethernet port for network connection
  • AM/FM tuner
  • remote control
  • 17-3/8"W x 5-1/4"H x 12-15/16"D
  • weight: 13.2 lbs.
  • warranty: 2 years
  • Our 60-day money-back guarantee

The sound solution for the less-is-more movement

On one hand, you want something that sounds much better than an iPod® or Bluetooth® speaker. On the other hand, you want something less complex than a surround sound system. You'll find your sweet spot in a stereo receiver. In addition to being easy to set up and use, many now offer Internet radio and other network music options. Add your music source and two speakers, and you're ready to relax and enjoy your tunes. You might even connect your TV for improved sound with movies and shows.

Harman Kardon HK 3770 Reviews

Average Customer Review:

34 reviews
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Great for the price

Written By good sounds, Delaware on Friday, November 27, 2015

This stereo receiver/amp With DAC , is simply the best for the price. they easily power my new Focal Chorus 726's and a sub woof......Has many backside ports and can be used in many ways.

Pros: Efficiency of the price..

Cons: Ummm...........I guess,....it wasn't Free.

Harman Kardon HK 3770

Written By Laser, Texas on Monday, November 16, 2015

Crutchfield Customer Review (What's this?)

Great system for running backyard speakers. Not equipped for surround but not needed in outdoor environment for my setup.

Pros: clean power

Cons: only one zone

Love this tuner!

Written By Swedefish, Illinois on Friday, October 30, 2015

Crutchfield Customer Review (What's this?)

This HK product is superb! I previously bought the HK 3770, and came back to buy this one with Bluetooth. The Bluetooth makes it! HK: sound tuner! Highly recommended.

Very Nice !!

Written By Bobby C, New York on Saturday, October 24, 2015

Crutchfield Customer Review (What's this?)

OK so lets get serious! The HK3770 is a fantastic reciever. CD player I also purchased with this amp. The Onko C-7030, very smooth affordable player. The Cd is connected with a optical wire for best possible fidelity. The speakers are JBL 4312C control monitors, old school maybe but they sound great.They are professional studio speakers. They are tiled up on speakers stands & no rugs on the floor. I am a musician & have recorded my records, I just got my butt kicked! Lets talk about what I played to sample this, first classical recordings on the light side Mitsuko Uchida, Mosart, Emerson String Quartet Medelssohn String Quartets WOW just beautiful. Then Kevyn Lettau a jazz Cd, A reissue a super 24 bit XRCD fron JVC this was better than amazing. How bout a rock record the new remix & mast from Steve Wilson of Jethro Tulls Aqualung. Man I was crying This new mix (Just like the original as not to alianate the listiner)has no compression so is like if your the studio oh my. Then the new master of The Rolling Stones Sticky Fingers Holy Crap Then James Taylor new record Before This World. Man oh man all of this sounded just great I am happy camper. The radio also is important to me so I'm very good with the FM & the AM section. I also do an I pod classic for parties not as good because its MP3's but I get that. this amp has many other features ,Internet, Bluetooth (my son will stream his phone. The only thing is the manual you have to figure things out for your self. GREAT AMP !!

Pros: Sounds great lots of power loud or soft The amp itself looks great. I also thought that the price is right for the quality.

Cons: Manual does not tell you how to do things except to plug in.


Written By QuintinR, Durham, NC on Friday, October 02, 2015

Crutchfield Customer Review (What's this?)

Excellent product; sleek design, great stereo receiver

Pros: Put's out great sound for surround sound stereo system throughout the house

Cons: A bit over pricey


Written By Ken Z. Chippewa Lake, OH, Ohio on Tuesday, September 08, 2015

Crutchfield Customer Review (What's this?)

If you like Stereo Sound, You'll love this unit!

Pros: Excellent Stereo Sound with beautiful separation. Overall audio sound is fantastic at All volume levels!

Cons: Needs more setup/operation information. Cannot override the 8 hour auto shutoff.


Written By Susan, Alabama on Sunday, July 26, 2015

Crutchfield Customer Review (What's this?)

I've had this receiver for almost 1 1/2 years. I told the Crutchfield sales rep who recommended this receiver that my criteria was a receiver that produced clear sound and could "play music" from my laptop music library. I had lots of problems the first week and could find NO helpful information on the HK website and certainly not from the almost worthless documentation that came with the receiver. The Crutchfield support team was patient and helpful, but because HK had/has so little documentation, their ability to help was limited. When I bought this I was under the impression that I could play music wirelessly. And I was able to do that, except that I had no control over what music it played. So, in order to play the music I wanted to play I used the bluetooth function exclusively. When I'd had the receiver about 6-8 months, the bluetooth became sketchy (that is, the music would skip--as in disappear--for seconds to minutes several times an hour) unless my laptop was right next to it as opposed to 10 feet away where I usually have it. I have since begun playing my music via a ZVOX (bluetooth) and have had no problem, so I must conclude it is the receiver not the laptop. So not only did I blow my money on a receiver, I also blew what I paid for the speakers.

Pros: When it worked, it was fine.

Cons: 1. After 6-8 months, bluetooth stopped working consistently (music skipped for up to a minute several times per hour). 2. Total lack of meaningful documentation.

Great receiver!

Written By BryanS, Illinois on Tuesday, June 23, 2015

Crutchfield Customer Review (What's this?)

So far, so good! I bought this to replace a cheaper receiver that I had my turntable hooked up to because I was moving the old receiver out to the garage. I think this one sounds much better than my old setup. I really love how this one has bluetooth integrated into the unit. The only criticism that I can think of is that the product manual is very bare bones. Some of the features and settings aren't really intuitive so it takes some time to figure out how to configure everything.

Pros: Bluetooth, sounds great, looks great

Cons: Documentation lacking detail - need to figure out how to use some of the features or configure some of the settings.

HK 3770

Written By 777Tick, Texas on Friday, May 15, 2015

Crutchfield Customer Review (What's this?)

Easy setup, crisp clean sound with my Klipsch La Scalas.

Pros: Clean design, easy setup nice remote. Love the Bluetooth

Cons: Presets would be nice on the panel. Better included manual would help. I have a DbX box that I need to make part of the tape circuit. Will figure it out eventually

power and more

Written By Charllie, Arizona on Wednesday, May 13, 2015

Crutchfield Customer Review (What's this?)

I provided the top rating on the equipment, but some things that were not desirable. In the box, was only a "starter" user guide that was far from being what is needed to use the equipment, and no mention of how to get a real user manual, sol had to call Harmon Kardon to get a user manual sent by email in PDF format. The sheer power prduced is good, but the FM tuner does not pick up stations I think it should. Only one output on the receiver, labeled "record", but found out it can be used as a normal output for other devices. Do not care for the "stereo" button which has to be ;pushed frequently to get the remote to operate properly to control the receiver. Use it to drive 2 Klipsch RF-82ll floor standing enclosures and it does the job very well.

Pros: good power

Cons: Manufacturer could do a better job providing a good user manual, either in hard copy or a disc.

HK 3770

Written By RB, Washington on Sunday, May 10, 2015

Crutchfield Customer Review (What's this?)

Didn't have the space for all that movie experience stuff.....just a plain receiver and speakers that would fit in the confines of a California Closet shelf setup... the HK 3770 sounds great...a previous reviewer was right.....lose that remote and you're toast..and the buttons on the receiver and remote are not intuitive...and you have to go to the HK website to get the manual....these things should have everything you need to know in the box..(oops, just hinted that I'm old)...paired it with a DT Pro Monitor 800 based on the Crutchfield rep recommendation due to size limitation of where in California Closet these had to go...and a Infinity Primus PS 38 (the only subwoofer that would fit in the largest cubby hole of the California Closet....and it sounds great !!!! Jazz, Classical, Latin...it all sounds great...

Pros: Sounds great....

Cons: Dependence on a remote that is not intuitive....buttons on the receiver are not intuitive...have to download manual from website...

A music lovers dream receiver

Written By Brick's, Pennsylvania on Wednesday, May 06, 2015

This receiver sounds and looks awesome. It makes work a pleasure because I can enjoy all the great sounding music.

Pros: Fast blue tooth connection.

As good as expected!

Written By TKM, League City, Texas on Sunday, May 03, 2015

Crutchfield Customer Review (What's this?)

I use this to drive several sets of speakers including ceiling mounts in the great room, outdoor by the pool, and in the garage. I'm only using stereo and Bluetooth with my Apple devices at this time. Everything works great. The product arrived as promised and I have been very satisfied with it's performance.

Pros: Easy to use, looks good, great performance.

Cons: None.

HK 3770

Written By Brian R, Minnesota on Sunday, May 03, 2015

Crutchfield Customer Review (What's this?)

Outstanding Product all is good

Pros: sounds great easy to use!!

Cons: none


Written By EDD, Florida on Monday, April 27, 2015

Crutchfield Customer Review (What's this?)

Very nice receiver, is very quiet and clear sounding. Pays phono vinyl with great clarity. Have a dvd player and cd changer plugged in also. Am very impressed with the unit.The component buttons on the face are a little small and hard to read, so the remote comes in real handy.Overall very nice piece.

Pros: Sound is very nice. Have a pair of Bose 301 and a pair of Bowers Wilkins with a Yamaha subwoofer plugged in . Handles power nicely with plenty of volume to spare.

Cons: The usb section does not shuffle the whole flash drive. Will only do one file at a time. That is my only peeve.


Written By Charlie, New York on Wednesday, April 22, 2015

Crutchfield Customer Review (What's this?)

Very impressed with the performance of the HK 3770. I think the sound is very clear and true with no noise. Not even close to breaking a sweat. A little disappointed with how it handles music on USB thumb drives. It does not advance to the next folder when the last song of the current completes. It does play the music off the thumb drive excellently though.

Pros: Great sound. No noise. Simple set up and use

Cons: Doesn't continue to the next folder when the last song completes in the current.

More than a Receiver

Written By Larry, Wisconsin on Monday, March 30, 2015

Crutchfield Customer Review (What's this?)

This receiver is amazing. Everything works great. The power to my Polk Audio speakers is amazing. The best part about this is the network radio stations and bluetooth. Once I hooked up my network cable I could listen stations around the world. There a lot of good genre stations to listen to. Whatever you want, you can find it. The other cool thing is the ease to hookup to my Iphone via BlueTooth. I was worried about the hassle of pairing the receiver and our iPhones. It did it all by itself. Too easy !!

HK 3770 Stereo Receiver

Written By Tim, Arkansas on Tuesday, March 10, 2015

Crutchfield Customer Review (What's this?)

I looked for a replacement for an old Kenwood Amp and tuner. Was amazed at how little is available for a basic Stereo system, that can handle inputs for phono, tape decks etc... This is the perfect match for "old Tech" and new with the option for Bluetooth, Network and Input for phone or Ipod. Distortion is non existent, so upgrading to some Klipsch speakers to go with it. Crutchfield CS was very knowledgeable and helpful in assisting me to choose this receiver. Ordering and delivery was absolutely hassle free.

Pros: Light weight, assume circuitry has changed drastically from the old heat sinks etc... Remote covers about everything. Just got it, so still learning.

Cons: Full operators manual had to be downloaded from HK. Manual that comes with unit is very brief, does not cover remote too well. Only con so far.

Harman Kardon HK 3770

Written By Mike, Illinois on Monday, February 23, 2015

Crutchfield Customer Review (What's this?)

Does every thing as expected. Performs well with my vintage Polk SDA speakers and my pono player

All Work, No Play

Written By Brian, Ardmore, OK on Saturday, February 14, 2015

Crutchfield Customer Review (What's this?)

Its been 25 years since I've purchased a preamp/amp set or receiver in this case - things have changed a great deal. This receiver has all the latest tech incorporated in it, and the sound matches the tech level - outstanding. Its not intuitive to use for the older crowd but once you spend the time understanding how things work, it has some great features / benefits.

Pros: Outstanding features, up to speed with related products (smart TV's, DVD/CD players) Plenty of power High quality appearance

Cons: Only compatible with Apple products - would like to see Anroid compatibility too No wireless option for connectivity / networking

Sharp and clean

Written By More Monkey, Maine on Monday, February 02, 2015

Crutchfield Customer Review (What's this?)

The receiver is just what I wanted: a non-surround, simple machine. Too many other receivers had many more features than I would ever use. This plays the radio and all my bluetooth phones and pads. The look is very sharp, it is super simple to use, and it sounds great (most important).

Harman Kardon HK 3770

Written By Clayton, New Hampshire on Monday, January 19, 2015

Crutchfield Customer Review (What's this?)

I've had this HK receiver for about 3 weeks now. It was easy to set up with a CD player and the TV (stereo output.) It was easy to connect it to my home (wired) internet via ethernet cable and the Bluetooth connected quickly. Most importantly, it sounds good. As a couple of other reviewers have noted, there is one significant drawback that prevented me from giving it 5 Stars. The buttons on the receiver are very small and hard to see. Somewhat irritating is that the labels for the buttons are also small and hard to see. If you plan to put this in any sort of cabinet that would cast a shadow on the front of the unit, forget it, you won't be able to see what you are doing. You are basically completely dependent on the remote, which is, thankfully, laid out fairly well. As another reviewer mentioned, guard the remote with your life, because if you lose it or it breaks, you have a big problem.

HK 3770

Written By TB, Massachusetts on Tuesday, January 13, 2015

Crutchfield Customer Review (What's this?)

Good clean sound with nice features such as blue tooth, phono input, sub woofer out put etc. Works well w our Bose speaker set up. Good separation

Pros: Clean sound, nice crisp base and clean clear treble. a lot better than what I expected from a 20-20,000 unit

Cons: Doesn't seem to have left-right balance, at least I haven't figured it out yet. A little scary that you have to have the remote to run it, my kids are good at losing them. More info from the mfg on function and use of control options would be helpful. Miss my EQ capabilty I had on our old system but the HK is pretty good with out it

Awesome Receiver

Written By JimE, Illinois on Saturday, January 03, 2015

Crutchfield Customer Review (What's this?)

I love this receiver. It brings old school power to modern devices with the Bluetooth capability. It brought my Boston Acoustic tower speakers to life! Sleek design and easy operations. I wanted this for my music, but our TV sounds great without surround sound.

Pros: Pure HK power and Bluetooth capability.

Cons: Little hard to see some of the function buttons on the face of the unit inside the entertainment center.

Harmon Kardan

Written By Mark, Nebraska City on Monday, December 29, 2014

Crutchfield Customer Review (What's this?)

Using as a wt room radio

Pros: Nice sound, clear highs

Cons: None

Old School/Digital tech

Written By PJ, San Juan, PR on Saturday, December 06, 2014

Crutchfield Customer Review (What's this?)

Analog decoder for phono input, CD's, etc... plus new digital advantages. Bluetooth is a handy tool.

Pros: Terrific stereo separation

Cons: none, so far


Written By McAdoo Jim, Collingdale PA on Saturday, November 15, 2014

Crutchfield Customer Review (What's this?)

Coming from a 2-channel dinosaur, this receiver rocks. Well balanced tone without any adjustments, Bluetooth works as advertised with an iPad, radio reception is great, and can satisfy the vinyl soul as well. Really don't need the sub with this machine; drives my Klipsch RF 82s smooth as a greasy goose on a hot rock. Thanks Crutchfield & HK!

Pros: See above

Cons: Zero zilch nada

Harman Kardon HK 3770

Written By JM, Long Isaland on Tuesday, October 28, 2014

Crutchfield Customer Review (What's this?)

So far, so good.

Harman Kardon HK 3770 Review

Written By Chris O., Austin, TX on Wednesday, September 03, 2014

Crutchfield Customer Review (What's this?)

Great looking and sounding amplifier! Easy to set up and operation is simple and to the point. Though the unit weighed much less than I anticipated, the sound leaves nothing to desire. Paired this with two Polk RTi A7's and the highs and lows are extremely clear and the unit delivers plenty of punch.

Great Stereo Receiver

Written By Alex, Louisiana on Tuesday, September 02, 2014

Crutchfield Customer Review (What's this?)

This amp sounds great and has plenty of power to push our old Cerwin Vega speakers with 15" woofer, 8" mid and 3 tweeters. It gets way too loud before any perceivable distortion. One small gripe is the lack of tweakability: not much in the way of customizing EQ. There also aren't any different modes, like for movie or music settings. But, so far we are loving the sound anyway.

Pros: Great sound. Plenty of Power for large speakers. Looks good. Good price. All the inputs we needed. Bluetooth works great.

Cons: Lack of EQ control. Lack of sound presets for different sources.

H & K 3770

Written By JJP, New Market, VA on Sunday, August 03, 2014

Needed a receiver to run 4 speakers and work with my IPOD. Does everything I expected it to do. Detects IPOD at twice the speed of the $1200.00 receiver it replaced. Love it.

Pros: Simple config

Cons: None

Great so far

Written By Colin F, Edison, NJ on Sunday, May 11, 2014

Crutchfield Customer Review (What's this?)

I have this receiver paired with two infinity primus floor standing speakers and an infinity primus sub. I was primarily interested in a system for music so the 2.1 setup works for me. I am still amazed at the clarity and detail this amp reproduces even at high volumes. Plenty of options for inputs is nice, though I mostly use one Aux in from my computer. Bluetooth is a plus though and works very very easily. I mostly listen to electronic, metal, alt rock, and oldies, all of which sound great. Don't regret my purchase at all.

Excellent and Versatile

Written By Scott, Eau Claire, WI on Monday, April 28, 2014

Crutchfield Customer Review (What's this?)

I have been enjoying this receiver about a week now. I am not completely tech savvy when it comes to things like networking a million devices but I can say that as far a bluetooth is concerned and and the basics of an old time analog receiver, I am very happy. I only have bluetooth devices and a couple hundred LPs which is what I use most. LPs sound great on this system. I don't have CDs but I am sure they would sound great too. I also use it for sound on my television, so I have great control and clarity when it comes to watching movies and such. Each input remembers it's own settings in regards to bass and treble which is also very cool. I do recommend this product to anyone who wants a great quality receiver but is not interested in having a big surround set up yet would like lots of new tech options. I plugged in my internet into the back of the unit from my router and now have many hundreds of digital radio channels from every corner of the world. There is much to say so I recommend looking at the specs and if you do not know a lot about networking, you may need to find a friend that does to help you out with sharing your computer files wirelessly with the receiver. Thanks.

Pros: Pros are the massive versitility and new technology while getting away from the surround sound thing and getting back to the basics of a STEREO two channel high powered receiver. For me a phono input is always one of the essenital requirements. I cannot imagine this unit being a dissapointment to anyone.

Cons: In regards to the cons of this unit, it is heavily dependant on the remote control. There is precious little you can do without the remote in fact. That includes adjusting bass, treble,and even balance, not to mention all the higher technologies that cannot be adjusted without the remote control. So, if you buy this unit, you will need to treat the remote with a lot of care as you are going to need it to work throughout the lifetime of the receiver.

Harman Kardon HK 3770

Written By Dave, Poplar Grove IL. on Tuesday, April 08, 2014

Crutchfield Customer Review (What's this?)

I grew up with 2 channel stereo's. Raw power and everything was big. Old school meets new technology. Everything from the past, but better. This HK is simple to hook up, 15 minutes maybe. Simple to use and really kicks!! This is used for outdoor sound paired with NHT's, WOW!!

Pros: Plenty of power. Simple easy, out of the box music in 15 min or less.

Cons: None

Hands-on research

What's in the box?

Download owner's manual

  • Stereo receiver
  • 6' AC power cord
  • Remote control
  • 2 "AAA" batteries
  • FM antenna
  • AM antenna
  • Quick Start Guide
  • Important Safety Instructions

Product Research

Audio Section
Network & Tuner Functions
USB/iPod Integration
Bluetooth & Remote Control

Audio Section

Output Power: The Harman/Kardon HK3770 stereo receiver features a 120 watt x 2-channel (8-ohms, 20Hz-20kHz, THD 0.07%) amplifier for great sound quality with little distortion even at high volumes.

High-Resolution 24-bit/192kHz DAC: This stereo receiver is equipped with a 24-bit/192-kHz DAC for excellent sound quality reproduction that is natural sounding.

Harman Volume: Harman volume is an advanced digital signal processing technology to control playback volume. It evens out the volume level on everything you watch, improving your listening experience. Once you choose the volume level, Harman Volume does the rest. It helps you avoid volume increases from commercials, volume differences when you change channels or switch sources, and brings out the dialog.

Analog Inputs/Output: The Harman/Kardon stereo receiver features five analog stereo RCA inputs to connect up to five audio components, and one stereo RCA record output to connect to a CD-recorder and other recording device. Included in the five analog inputs is a Phono input (MM) for vinyl playback.

Digital Inputs: The HK3770 receiver is equipped with two optical (toslink) digital inputs and one coaxial (RCA) digital input for connection of a TV or media streaming device.

Phono Input: In addition to the five analog inputs, the stereo receiver is fitted with a Phono input (MM) for vinyl playback.

A & B Speaker Terminals: This receiver features two sets of speaker outputs (A & B), each with binding-post terminals. You can independently turn on or off each pair of speakers, as well as play both pair of speakers. The speaker pairs are wired internally in parallel. These binding post terminals will accept bare wire (up to 10AWG), pin-connectors, and banana plugs (single or dual).

Subwoofer Output: The stereo receiver is equipped with a mono subwoofer output for connecting a powered subwoofer. The output is full-range, so you will need to connect a powered subwoofer with a built-in crossover.

Headphone Jack: There is a full-size (1/4") headphone jack on the front panel. When headphones are plugged in the speaker outputs are automatically muted.

Network & Tuner Functions

Ethernet LAN Port: The H/K stereo receiver is fitted with a RJ-45 Ethernet (LAN) port to connect the receiver to your home network to access your DLNA music server or Internet Radio.

Internet Radio (from vTuner): You can also listen to Internet radio stations using the vTuner Internet Radio Station database service particularly customized for this unit, providing a database of numerous radio stations around the world. You can search for Internet Radio stations by Location, Genre, New, Popular, or Podcast. You can store up to 30 of your favorite stations.

DLNA Certified: The HK3770 is DLNA (Digital Living Network Alliance) 1.5 and Windows 7/8 compliant for audio networking. This means it's easier for you to access and enjoy digital music stored on your PC. Compatible music files include MP3 (32-320kbps; 8-48kHz) and WMA (5-192kbps; 8-48kHz). You can use your PC to play music content through your audio system, or use the H/K receiver to browse and play music files on computer's hard drive. You can control playback of your streamed audio files from the network receiver's remote control. The receiver also supports ID3-Tag and META tag information so song title, artist name, and album name can be displayed from the unit's front-panel display.

AM/FM Tuner: The Harman/Kardon stereo receiver features a built-in AM/FM tuner with manual, seek, and preset tuning (auto/manual). You can store up to 30 AM/FM presets (in any combination). You're able to scan through these presets (5-seconds each) to help you search for your favorite music. You also can tune directly to a station using the numeric keypad on the included remote control.

USB/iPod Integration

Front-Panel USB Port: This stereo receiver is equipped with a front-panel USB (type-A) port that allows you to enjoy playback of MP3 (32-320kbps; 8-48kHz) and WMA (5-192kbps; 8-48kHz) music files from a USB mass storage class memory device; such as select Android smartphones (Froyo/Gingerbread OS only), portable MP3 players, or USB thumbdrives (not compatible with USB HDDs). The USB device must be formatted in FAT or FAT32. Using the unit's front-panel display and included remote control, you can browse your stored music files on your connected USB memory device. USB portable audio devices that can be charged via USB will be charged when plugged into the network stereo receiver's USB port (5V/0.5A).

iPod/iPhone Direct: The USB (type-A) port on the front-panel provides convenient connection for your iPod/iPhone so you can listen to your stored music and music apps through the H/K stereo receiver. The iPod/iPhone USB digital connection means that the digital audio signal from your iPod/iPhone is transmitted directly to the system, minimizing noise interference and allowing use of the receiver's DAC, not the DAC in your iPod/iPhone. This results in more precise sound reproduction. You can choose to control your Apple device from its clickwheel/touchscreen or from the receiver.. Basic playback functions (such as Play/Pause, Previous/Next Track) can be controlled by the receiver's remote. Song/artist information on your iPod/iPhone will display on your connected the unit's front-panel display. Your iPod/iPhone's battery will be charged while connected to the receiver. Using the Lightning- or Dock-cable that came with your Apple device to connect directly to the H/K stereo receiver, iPod/iPhone compatibility is as follows (as of 9/25/2014):

Apple Device Generation Tested Version Media Type Control Type Display Type Charge
Audio Video Remote iPod/iPhone Artist/Song Text Track Info
iPad 1 5.1.1 Y N Y Y Y Y Y
2/3 8.0 Y N Y Y Y Y Y
4/air 8.0 Y N Y Y Y Y Y
mini 8.0 Y N Y Y Y Y Y
iPhone 2G 3.1.3 Y N Y Y Y Y Y
3G 4.2.1 Y N Y Y Y Y Y
3GS 5.1.1 Y N Y Y Y Y Y
4 7.1.2 Y N Y Y Y Y Y
4S 8.0 Y N Y Y Y Y Y
5/5C/5S 8.0 Y N Y Y Y Y Y
6/6+ 8.0 Y N Y Y Y Y Y
touch 1st 2.2.1 Y N Y Y Y Y Y
2nd 4.2.1 Y N Y Y Y Y Y
3rd 5.1.1 Y N Y Y Y Y Y
4th 6.1.2 Y N Y Y Y Y Y
5th 8.0 Y N Y Y Y Y Y
2nd 1.1.3 Y N Y Y Y Y Y
3rd 1.1.3 Y N Y Y Y Y Y
4th 1.0.4 Y N Y Y Y Y Y
5th 1.0.2 Y N Y Y Y Y Y
6th 1.2 PC Y N Y Y Y Y Y
7th 1.02 PC Y N Y Y Y Y Y
classic 80GB 1.1.2 Y N Y Y Y Y Y
120GB 2.0.1 Y N Y Y Y Y Y
160GB 2.0.4 Y N Y Y Y Y Y
Note: Apple iPod/iPhone software updates may change functionality results. If you download a newer software version, you may need to reset the unit and your iPod/iPhone to regain functionality. If this doesn't work, you may need to wait until a newer software update is available.

Remote Control

Built-in Bluetooth: The Harman/Kardon receiver features built-in Bluetooth with support for profiles A2DP 1.2 and AVRCP 1.3. You'll be able to wirelessly stream stored music and music apps from your Bluetooth-enabled Apple device, Android smartphone/tablet, portable audio player, laptop, or PC to the H/K receiver. You will also be able to control basic playback functions (Play/Pause, Fast Forward/Rewind, Previous/Next Track) using the receiver's remote control. Advanced music operation will still need to be handled from your Bluetooth-enable device. There is no song/artist information display on the receiver's front-panel display. Continue to use your Bluetooth device's screen to view song/artist info.

Note: Due to the differences in Bluetooth technology, some Bluetooth enabled devices may be incompatible, function improperly, or may not support all features when used with the H/K receiver.

Remote Control: The HK3770 comes with an IR remote control for wireless operation of the receiver and your connected USB or iPod device.

H/K Remote App: Downloading the free Harman/Kardon Remote app from the iTunes App store onto your Apple iOS (5.0+) device or from the Google Play Store onto your Android (2.2+) device lets you control the HK3770 receiver from your smartphone or tablet device. You'll also be able to control your Apple iOS or Android device's stored music from the Harman/Kardon Remote app.

  • Source Selection: You'll be able to access and select all of the receiver source inputs (Analog 1-5 inputs, Phono input, Optical/Coaxial, DLNA, vTuner, Bluetooth, USB, or iPod) through your Apple iOS or Android device with the Harmon/Kardon Remote app installed.
  • Audio Settings: You have control of the receiver 's Volume and other audio adjustments through the Harman/Kardon Remote app and your Apple iOS/Android device.
  • Music Control: You can control all the music you have stored on your compatible Apple iOS/Android device through the Harman/Kardon Remote app. You'll be able to search your music by Song, Artist, Album, Playlist, and Genre. You also get basic playback functions such as Play/Pause, Previous/Next Track, Fast Forward/Rewind, and Repeat/Random. To access music apps, you'll need to exit the Harman/Kardon Remote app and select your desired music app on your iOS or Android device.

IR Input/Output: There is one minijack (3.5mm) remote input and one minijack (3.5mm) remote output on the rear panel of this unit. If the receiver is placed behind a solid or smoked glass door, the obstruction may prevent the front panel IR sensor from receiving commands from the remote. If the unit is positioned so the front panel IR sensor cannot receive commands from the remote, an optional IR repeater system (sold separately) may be connected to the Remote IR In jack and positioned to accept commands from the remote. The Remote IR Out jack can be connected to the remote input jack of compatible equipment to relay commands to that equipment.

Trigger Output: This minijack (3.5mm) output sends a 12-volt DC turn-on signal to another component that accepts a 12-volt trigger, such as a CD player or powered subwoofer.

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