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How to connect your home theater subwoofer

Plus tips on placement and fine-tuning

In a nutshell: To get the biggest bang from your new home subwoofer, you need to do three things.

  1. Properly connect it to your home theater receiver
  2. Place it in just the right spot
  3. Tweak it — calibrate your system and adjust the sub's settings

Read on to learn everything you need to know.


ight, well-defined and, yes, DEEP bass is a key component of any home theater. A powered subwoofer is a must for bringing those explosions, crashes, and other big-time action to life. Here's how to hook it up and dial it in.

1. How to connect your subwoofer to your receiver

All powered subwoofers require two connections: power and signal.

For power, you just need a nearby outlet. We highly recommend plugging your sub into a power protection device to guard against surges.

For the signal, use a subwoofer cable  to connect your receiver’s subwoofer output to the LFE (low frequency effect) input on the sub.

LFE connection to a home theater receiver.

Many stereo receivers and amps also have subwoofer outputs for these connections. Don't have an LFE option? See our bonus tip below.

2. How to choose the right place for your sub

Typically you should try and put the subwoofer near your front speakers. But let’s be honest: most people put their subwoofer wherever they have room. And that’s not necessarily a bad idea.

Subwoofer placement illustration.

The low-frequency waves we hear as “bass” are less directional than higher frequencies generated by full-range speakers. That means that even if the subwoofer isn’t close to your TV, your ears will have trouble telling the difference.

Some manufacturers recommend placing your sub in a corner. The walls can help bounce more waves back toward the seating areas. If you’re after very full, exciting bass response, this is a good option.

If you have a few placement options and a long enough subwoofer cable, you may want to experiment with different placement options. Fire up some music with some good bass. Then sit in your primary seat and listen. Does the bass sound weak? Or maybe too boomy?

Now move to a couple of different spots and listen. You’ll probably notice that the bass can sound very different as you change locations.

Illustration of room with alternate sub placements.

If you used auto-calibration to set up your home theater system, remember to rerun it every time you move your sub.

To tailor the bass to your “sweet spot” use the popular method known as “crawling.” Start with the subwoofer at or near your primary listening position. Then stand in different spots the sub could go and listen to your chosen sample music. When you find a spot where the bass sounds just right, that’s where you should put your sub.

Not enough bass? Try two subs

If you have a very large room that’s bass-challenged, we recommend adding a second subwoofer. It’s the best option for evenly distributing bass response in a large space. Most newer receivers offer a second subwoofer output for connection. Or you can simply use a Y-adapter.

Illustration of room with two subs.

For some suggestions and diagrams of speaker setups for different floor plans, check out our article on home theater speaker placement.

3. Tweak it

Most receivers include a calibration microphone to optimize the performance of your speakers. Usually, these room correction systems do a very good job of adapting the sound to your surroundings. Check out our Home theater receiver setup guide for more info and to watch a video about auto calibration.

But what if your receiver doesn’t have auto calibration? Or you’ve tried it and still aren't completely satisfied? You can make some manual adjustments.

Setting speaker size — Go into your receiver’s settings menu and find the speaker setup.  There will be a size setting for your front left and right speakers. This actually has less to do with the physical size of your speaker. It's more about bass management.

Try setting the speakers to “small,” even if you’re using floor-standing speakers. The “small” setting will send more of the low frequencies to the subwoofer.

Crossover — Setting the speaker size automatically sets a crossover point. But you can fine-tune it manually. For bookshelf speakers, you’ll want a crossover frequency around 120 Hz. For large tower speakers, try 60 Hz.

Phase switch — If your sub still feels a little off, your subwoofer may be out of phase with your speakers. Most subs have a two-position phase switch on the back. Toggle it to the other setting and see if you get better bass.

Level control — Most subs have independent volume controls. It’s an easy way to get a little more oomph or dial back a particularly loud soundtrack. You may need to make adjustments from movie to movie.

Put your sub on a platform — If your floor, walls, and ceiling vibrate to the beat of your sub, you get unwanted resonances that color the sound of your bass. To stop the vibrations, place your sub on a sound-absorbing platform.

Auralex SubDude

The Auralex SubDude-II isolation platform decouples your subwoofer from the floor, which gives you cleaner, tighter bass.

Bonus tip

What if my receiver doesn’t have a sub output or my sub has no LFE input?

Depending on your available connections, you may be able connect your sub using one of the following two options:

To use stereo preamp-level connections, you may have to switch your sub out of LFE mode.

Diagram of connection for pre-out/main-in.

With some subs, you can connect your receiver's front speaker outputs to the sub's speaker-level inputs, and then connect your front speakers to the sub's speaker outputs.

Diagram of connection for sub's speaker-level inputs.

Our tech support team is here to help

If you purchase your home theater gear from Crutchfield, our Virginia-based Tech Support team can help you with setup, connections, and fine-tuning. Give them a call at the phone number found on your invoice and shipping confirmation email.

Need help choosing a powered subwoofer?

Need help choosing a sub? Check out our Subwoofers buying guide. Or contact one of our Advisors via chat, email, or phone at 1(888) 955-6000.

Last updated 6/25/2019
  • John Mthimuye from Johannesburg - RSA

    Posted on 3/12/2019

    Hi, need some advise. My BOSE AM15 SubWoofer has stopped working. Can I hook-up the Klipsch Sub as a replacement (while still using the rest of the Bose cube speakers? Is this recommended, do you think it will work?

    Kramer Crane from Crutchfield on 3/12/2019
    Hi John, I'm sorry to hear about your sub not working. Your Acoustimass 15 is an all-in-one system. Since the subwoofer provides both power and signal distribution to the satellite speakers, there's no way to remove it and still use the cube speakers. I'd look into getting it repaired, or replace the system in its entirety.
  • William Nametka from Richfield

    Posted on 1/28/2019

    Is speaker wire same wire to use for subwoofer?. I'd like a wired subwoofer. Thanks,

    Kramer Crane from Crutchfield on 1/29/2019
    Hi William, you'll want to use a subwoofer cable to connect your sub to your receiver.
  • KParn from Concord, NH

    Posted on 1/10/2019

    I have a pair of 20 year old Klipsch RB-5 bookshelf speakers that I'm looking forward to using with this subwoofer hooked up to my new Yamaha AV receiver when I receive it.

  • Ross Carter from Baxter

    Posted on 11/28/2018

    I have only one preamp on the back of my receiver, but I have a older cerwin Vega sub that has left and right inputs. Should I just be using a y cable adaptor for this, or is there something I don't know. Seems like it loses sound quality by doing this.

  • Antonio from Houston

    Posted on 10/7/2018

    I have a couple of Klipsch, so far they sound really good but now I am wonder if I have to change my speaker configuration from Large to small? Currently, I running klispch RP-260F, 440C, 240surround on a yamaha advantange 770.

    Kramer Crane from Crutchfield on 10/7/2018
    Hi Antonio, I see no compelling reason to make the change, especially if you like how your system sounds now.

    The only thing that comes to mind is that if while listening to music your powered subwoofer isn't turning on, changing the front speakers from "large" to "small" within the receiver's menu will often fix that.
  • Joe from Jackson

    Posted on 9/12/2018

    I got a Sony power subwoofer sw500 from a friend never had a power subwoofer before how do you wire it up i plug the rca in to the receiver and I have no sound I'm I doing something wrong

    Kramer Crane from Crutchfield on 9/17/2018
    Hey Joe, I'm sorry to hear you're having trouble with your sub. Give us a call and we'll see if we can figure out what's going on.
  • mike Higginbotham from Springfield

    Posted on 6/18/2018

    Q: Just want to confirm that your graphic is correct, the one followed by, "Or you can use speaker wire to connect to your sub's speaker-level inputs:" In that graphic you show connections going from (-) to (+) for the left speaker connections, both receiver to sub woofer and from sub woofer to left speaker. I have an old Yamaha AVX-500 without sub woofer out. Thanks.

    Jeff Miller from Crutchfield on 6/19/2018
    Yes, the graphic is correct. But if you're going to use that connection method, make sure your subwoofer has both inputs and outputs.
  • Todd Christ from Folsom

    Posted on 6/7/2018

    what's your take on wireless subwoofer/LFE outputs to get around the need for a super long cable?

    Jeff Miller from Crutchfield on 6/19/2018
    Wireless technology has improved a lot in the last few years. I'd say go for it if you can't get a long enough cable!
  • Sachin from San Jose

    Posted on 11/21/2017

    where would the LFE cable from Bose accoustimass III ( proprietary? cable) plug in the Onkyo tx nr 656

  • Jeff Miller from Crutchfield

    Posted on 10/10/2017

    Hi James,

    I couldn't find that Onkyo receiver, but sounds like it was part of a home theater in a box system. Those systems are usually pretty contained and the receivers are built to match the speakers that come with them. So I can't speak to the crossover capability of that receiver.

    But you should be able to use the same active sub output and connect to either the left- or right-channel input on the sub.

  • James from Las Vegas

    Posted on 10/6/2017

    Hello, I have an old Onyo R3330 5.1 receiver it does not have a standard LFE pre out for the subwoofer. It came with a passive subwoofer that connected to its own channel through regular speaker wires and received its power and signal from the Onyo receiver. I have just upgraded to a new active subwoofer bic H-100II it does have line level inputs. My question is can I safely connect the receiver to to new subwoofer using the speaker wire connect from the Subwoofer out on the reciever to the line level in one the new subwoofer. Or do I need to connect the my front speakers outputs to the new subwoofer and the content the subwoofer to the speakers. Like most diagrams show. I would prefer to not run my front speakers off the sub if possible, but I am concerned that the signal coming of of the receivers subwoofer out through the speaker wires into the new subwoofer could potentially cause damage to the receiver or subwoofer. Sorry long post...

  • Harry from Dayton, OH

    Posted on 4/29/2017

    For some time I fought with a room which had a large standing wave along with a receiver whose auto-calibration did not extend to the LFE out. I tried locations all over the room with no joy. I finally stopped the rattle in my fillings by selecting "No LFE", connecting the sub to the front channels' pre-amp outs, setting the crossover on the sub to 40 HZ (the -6db point on my front speakers) and auto-calibrating. Since the front speakers roll off cleanly, this results in very even solid bass in a very bad room. I could have gotten the same result by connecting to the speaker outputs, but the pre-amp out was the easier install.

  • Dave Bar from Crutchfield

    Posted on 5/25/2016

    Hi Pattrick, Generally speaking, a single LFE cable connection from the receiver to the sub is all that's necessary, since the mono LFE output signal is identical on most (but not all) receivers. If the dual connection is working for you, I'd leave it. If you're curious, you could always try it with a single cable.

  • Pattrick from Tacoma

    Posted on 5/25/2016

    Hi Dave. I have two LFE subwoofer outputs on my Yamaha receiver. Currently both of them are plugged in to the 2 LFE inputs (right and left) on my subwoofer. It works fine but I'm wondering if this the optimal setup? Thanks!

  • Dave Bar from Crutchfield

    Posted on 5/18/2016

    No problem, Mike. Please check your Definitive's owner's manual (or possibly directly with them), but you should be able to dispense with the LFE connection altogether and go straight speaker-level in from your amp. I see no issues with using your Scott to drive the BP2000s. If it's a vacuum tube model (you're lucky!), there may be multiple speaker taps so be sure to use the ones that correctly match your speaker's impedance. If it's solid state, just hook it up as you normally would with most newer amps. Best of luck!

  • Mike from Long Island

    Posted on 5/17/2016

    Sorry for the confusion, Dave. I have a B&K AVP 1000 preamp & B&K ST3030 amp. When I bought the speakers, the salesman asked how I would wire them up. Half jokingly, I said "with 14 guage Radio Shack wire". He then questioned my intelligence under his breath & gave me a diagram & coincidently also sold me some Monster cables to hook up with...Both B&Ks are on their way out, having been in & out of the shop several times, hence the new Macs... Finally, I just wanted to know if it was feasable to hook up an old Scott receiver to those BP2000s, as a stop gap when the B&Ks blow up again. Thanks again !

  • Dave Bar from Crutchfield

    Posted on 5/16/2016

    Hi Mike, While a McIntosh preamp would certainly be a treat, I'm not entirely sure where or how you would plan to install it in your system. I'm guessing you must have a power amp? Would you be using your old Scott receiver as the power amp?

    I'm not familiar specifically with the Definitive Technology BP2000s, but if they're anything like DT's other powered towers, the LFE input is strictly optional. In fact, DT usually recommends connecting their powered towers using only the speaker-level inputs, rather than line-level or LFE connections. Please give our advisors a call to discuss the connection options for the Mac and your towers.

  • Mike from Long Island

    Posted on 5/16/2016

    Hi Dave. I'm thinking of treating myself to a MacIntosh preamp soon. The speakers I have are Definitive Tech BP2000s with their own powered subs & LFE inputs. The Mac preamp doesn't have a LFE output. How would I go about hooking that up ? Also, I have an old Scott Stereomaster receiver that I use in my garage. How would that get hooked up to the BP2000s ? Thanks !

  • Dave Bar from Crutchfield

    Posted on 2/5/2016

    Ed, I believe you summed it up perfectly: this is an apples and oranges situation. I'm quite certain that the Blu-ray format is capable of providing bone-crushing bass! My guess is that your 10" powered sub is simply not moving as much air as your old floor-standing speakers. A larger sub is probably the answer. Please get in touch (call, chat, or email) with our advisors for recommendations.

  • Ed Rieth from Phoenix

    Posted on 2/4/2016

    About 15 years ago, LaserDisc was all the rage in my house and in my estimation, provided great audio. At that time, I ran the Pioneer LaserDisc player through a Pioneer receiver. The speakers were a small center and small rear satellites with two large floor standing cabinet speakers for the fronts. These were comprised of a tweeter, mid and 15" subs. Since that time, I've changed to a Sony Blu Ray player that runs through a brand new Denon AVRX2200 and the speakers are Boston Acoustics MicroSystem 9000II, with a single 10" powered sub. I just cannot seem to replicate the same bass "punch" while watching Blu Ray as I realized when watching movies on LaserDisc. I know it's not an issue with the receiver; it's far superior. Is the audio quality between LaserDisc and Blu Ray just that different or am I comparing apples and oranges between the two 15" woofers in the cabinets and the 10" powered sub? Any recommendations? I've just completed all my calibrations and am running the powered sub on LFE and it's set at 120Hz through the receiver. Thanks!

  • Dave Bar from Crutchfield

    Posted on 1/11/2016

    That's a tough one, Mark. Of course, if you purchased it from Crutchfield you can always call and talk to our techs to see if there might be a simple fix. If it's an extensive technical issue, I'm thinking that the cost of out-of-warranty repair may make it more logical to consider a replacement.

  • mark from cincinnati

    Posted on 1/10/2016

    I have an infinity primus ps38 for about 8 years and now it sounds like wind is blowing through it I'm unsure as to what it is maybe you can guide me on the matter do I scrap it for a new one or can it be fixed.

  • Tim Dillenbeck from Santa Monica

    Posted on 12/24/2015

    Re: shannon from new port richey "I tried connecting the cable from the left and right output on the sub to the sub output on my receiver and no bass at all. " It's not surprising to have no bass at all if you connected the sub's left and right OUTPUTS to your receiver's subwoofer OUTPUT. Try connecting your sub's INPUT to the receiver's sub OUTPUT. Chances are that should correct the problem. Preamp outputs to amp inputs; never preamp outputs to amp outputs. If your sub has L and R outputs, it likely also has L and R inputs. The sub outputs would either go to: (1) L & R satellite speakers, if the sub has additional built-in amp channels to power them, or (2) the L & R inputs of an external power amp driving unpowered satellite speakers, or straight to active powered speakers, such as found in many computer desktop systems. In either case the sub's outputs are usually high-pass filtered to screen out those low frequencies handled by the sub. Check your sub owner's manual or find a copy online. One last thing. Don't forget the subwoofer Polarity (0 to 180) switch. The wrong setting can often reduce the apparent bass response of a system, giving you the impression of "no bass at all." Good luck.

  • Dave Bar from Crutchfield

    Posted on 11/5/2015

    Phillip, Is it possible for you to turn down the volume level of the sub, either from the receiver's settings menu or on the back panel of the sub itself? If so, that's what I would do. Either that or get a bigger, more powerful sub that can keep up with your amp/speaker combo. If that doesn't work, you can also get expert Crutchfield Tech Support - 90 days-worth for only $30. Check out our tech support page for details.

  • Phillip Jost from Houston

    Posted on 11/5/2015

    I have a set of Polk Audio RTI A9's powered by an Emotiva XPA-2 300x2 RMS amp (not bought from Crutchfield :(, sorry). My Def Audio SC4000 Subwoofer is connected through LFE to my Pioneer VSX-1124 receiver. The problem I have is the SC4000 is clipping at high volume when the towers aren't. Any recommendations?

  • Dave Bar from Crutchfield

    Posted on 10/1/2015

    Victor, if it's an "out of sync", or phase, issue (basically, where the subwoofer's cone is moving in the opposite direction from the main speakers' woofers), try switching the "phase" control on your sub (if it has one) to the opposite setting. If it's more a matter of the subwoofer's cone actually popping or bottoming out, turn it down! Every subwoofer has its limits, and you may have just discovered yours.

  • Victor from St cloud

    Posted on 9/30/2015

    I recently purchased a marantz 1506 with 2 klipsch R26 towers, 1 R25 center and a SW10 sub for a 3.1 setup. I have all my connections set correctly and used recommendations via audessey . Yet my sub keeps popping almost out of sync. I don't have space to add SATs. Any advice?

  • Dave Bar from Crutchfield

    Posted on 8/24/2015

    Shannon, It's possible you may need to access your receiver's speaker configuration settings in the setup menu to tell it that you have a subwoofer hooked up to its LFE (Low Frequency Effects) output. If it doesn't think you have a sub connected, it won't send any signal through that output. Accessing those settings without a remote may be difficult. You might try referring to your owner's manual, or check online at the manufacturer's website if you don't have one. Good luck.

  • shannon from new port richey

    Posted on 8/23/2015

    I connected my sub to my receiver with an RCA cable as recommended. I tried connecting the cable from the left and right output on the sub to the sub output on my reciever and no base at all. I am not sure if I have to change somethiing on my receiver to get the base to sound from the sub. I believe it is connected correctly. I do not have the remote for my receiver and it seems as though I may be able to scroll through more options on my receiver if I had the remote. I tried changing the settings on the receiver, but can only go from having the speakers all on or off. What am I doing wrong? Thanks for helping shannon

  • Dave Bar from Crutchfield

    Posted on 8/3/2015

    Butch, I found an owner's manual for a 120 watt RCA powered subwoofer. I don't know for certain whether this is your exact model, but with any luck it might shed some light on your situation.

  • Butch Repa from granger, tx

    Posted on 8/1/2015

    I have an old school RCA 120watt sub from 10 yrs back and have checked numerous Places and they all told me that the newer stereo system s don't have the sub input mine hasso what exactly can I doit also has A 2 terminal connection for high level and low level input connection of speaker wire . can I use those to hook up and do receiver or am I just out of luck?

  • Dave Bar from Crutchfield

    Posted on 7/22/2015

    Russ, Powered subs vary all over the map with the type of connections they offer. Most that have a right and left line input don't usually require that both inputs are connected when using a mono LFE connection from your receiver. In fact many, like this MartinLogan Dynamo 500, reserve either the right (as in the case of the MartinLogan) or left line level input specifically for the LFE connection. You can probably just use one leg of your Y-adapter to connect your first sub, and the other leg to connect your second sub with an extension cable to reach it (unless your sub has a line out connection, as well, in which case you can just daisy chain the two subs together).

    I'll admit it can get a little tricky because of all the variation from brand to brand and model to model. If you bought your gear from Crutchfield, you can call Tech Support for free help hooking up your subs. Otherwise, it might be a good idea to check with the sub's manufacturer for specific advice.

  • Russ from Soddy Daisy

    Posted on 7/22/2015

    I have a receiver with one LFE OUT. Currenty I am running one sub, but have another that I am adding to my system. I split the connection with a Y female to two male with a L & R in to the current sub. I am wondering how best to add the new sub. A diagram would be very helpful. Thanks!!