Question about JBL S120PII Subwoofer

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Subwoofer not powering enough (Sounds like under powered 8inch)

When I have my subwoofer hooked up and have it cranked all the way on the sub output, it barely pounds or does anything except for it sounds like its being somewhat medium powered. Even with HIGH bass music it dosent sound correct. Almost like it Distorts sometimes or even dosent even pound. I used to own the 10in version of this sub but used warranty when that one blew. Someone please tell me why my sub isnt acting like it should.

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Get a nice monster subwoofer cable and a Subwoofer PowerCenterâ„¢ SW 200 with Clean Powerâ„¢ Stage 1 get it from like amazon and you'll definately see a difference and also put the sub in like a corner

Posted on Jan 23, 2010

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How to hook up emerson subwoofer sw 03


For powered sub :If your receiver has a sub woofer output on female RCA plug, that is the way to go. If no output you will have to get a speaker line to line output converter to then connect to your subwoofer amp input.

Unpowered sub - just hook up across the speaker terminals for each channel making sure that you hook it up in phase.

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How do i set up my subwoofer sawm40


Sounds like you have a passive subwoofer, you run speaker wire from 'front speaker receiver out' to the subwoofer, the 'subwoofer out' to your front speakers. Seem like your sub has a crossover that grabs the bass frequencies and passes off the rest to the front speakers

If you have a 'subwoofer line out' on your reciever and a 'line in' on you subwoofer then just use that single wire, this would be for a powered sub. You know that you have a powered sub if your sub has a power cord attached to it.

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I have power but no sound. I have hooked up another sub and it works fine.


Lack of sound as you have confirmed, lies in the sub. the sub is faulty. check the sound I.C in the Sub and the output side If and only if you are a quarlified technician. Else, a technician needs to help change the output I.C and check the transistors likewise.

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Is it possible to hook the infinity bu-1 subwoofer to a home theater system where the subwoofer output is straight power say it"s like 25 watts coming out of that one channel and before the original...


In general higher speaker impedance is safer than lower impedance for the amp. Don't expect anything impressive re: audio output from a passive (unpowered) sub if your HTS says it pushes only 25 watts. Without frequency bandwidth and distortion noted the spec is virtually useless as a comparison.

The BU-1 is a powered sub that accepts either RCA Line Level or HIGH LEVEL amplifier power. If you use the latter, impedance is a non-issue because the input feeds the BU-1's internal amp, not the speaker directly. You should be okay.

Perhaps if we knew some specifics about the HTS we could do more than guess.

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Sounds like you have everything hooked up properly. Make sure the outlet is providing AC power to the sub. Check the power switch on the sub.

If it is not working still; bring it back and swap it for another one before you warranty runs out.

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Connect powered subwoofer


  • If your receiver has a dedicated subwoofer line level output, we recommend connecting your subwoofer to this jack. Most receivers will have just one (mono) subwoofer output, while quite a few subs require two inputs. You can use an RCA "Y" adapter cord , which is a cable with one female RCA jack at one end, and two male RCA plugs at the other. Some receivers require menu settings (such as "sub-on" or "front speakers-small") that must be made before the sub output will be active.

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    Subwoofer to receiver hookup


    In general, there are two ways to hook up your sub-woofer. First using the high level outputs from your receiver ( speaker output from the front R & L speaker terminals ) run a set of wires from the outputs to the speaker inputs on the sub-woofer, you do this in concert with the speaker wires going to the front R & L speakers which you then attach to the R & L speaker outputs on the sub woofer amp. Note that the sub woofer doesn't power your front speakers, the connections from the sub amp are just a pass through connection where the signal needed by the sub is parasitically taken from the inputs.
    Second is via a low level output from your receiver / amp to the low level input on your sub amp. This is normally done via a RCA type of patch cable and connected to the sub woofer RCA jack on the rear of the source receiver or amp, Next run the patch cord to the sub amp an into the RCA jack input. IF you have a right and left input, use the Right input.

    john

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    Subwoofer connection


    if this is ao powered sub, that plugs into the wall, there should be no problems, if it is powered solely by the reciever it may work fine but be sure you dont exceed amperage on the subwoofer.

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    Cerwin vega ht-10d subwoofer won't work in yamaha reciever


    Well, as I know, your Cerwin Vega subwoofer is designed for use with stereo systems. Therefore, it has only 2 channels for input, and 2 channels for output as well. However, you can try this out; the first thing I suggest is that you hook up your main front channels through the subwoofer. All you have to do is to connect the subwoofer input to the front channel output on the amp, then hook up your front speakers to the satellite output on the subwoofer. As long as you make sure that system is working on 8 ohms, I believe this can activate the subwoofer.

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