The receiver works perfectly, all speakers work, subwoofer has power, subwoofer has output when it's cord is plugged into its back and the other end touches metal on the back of the receiver making a loud bass noise. There is only one way to connect the subwoofer, from "out" on the back of the receiver, into the only port on the back of the subwoofer. The subwoofer does nothing when plugged in correctly.
On my AV amp it has separate volume for each speaker. I have to press the sound button
on the remote to access this. The subwoofer setting has to be set to between +4dB and maximum.
If your subwoofer has it's own volume control set your receiver to maximum and set your subs
volume from its' own control.
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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.
Is it powered on? (sorry, I know that's too elementary) Is it connected properly? (you have a cable securely plugged into your receiver's subwoofer line level output and securely plugged into the subwoofer in in the subwoofer) Is your system configured properly to send a signal to your subwoofer?
Does your receiver have a menu system you can use to manually configure your speakers?
If it does, have you told your system that you have a subwoofer?
If it does, have you set your other speakers to "small" (believe it or not, even with full-sized floor standing speakers this is a good practice)? Sometimes, if the other speakers are set to Large, an AV receiver may not output a subwoofer signal.
Check all the rest of your receiver's speaker parameters through its menu system.
On your subwoofer, do you have the Level turned all the way off?
Where is the cut-off frequency set? (if it's set too low, and your source material doesn't go down that low, you may not hear anything through it)
Is the cable good? (use a multimeter to check) Is the receiver outputting a signal through the subwoofer out port? (again, use a multimeter to check)
Hi, ok the Bose Acoustimass III system consists of two small cube speakers and one subwoofer unit called the Acoustimass bass module. If the subwoofer stops working, three points can be the cause of the failure. The Bose Acoustimass III is a passive system, meaning the speakers do not power themselves, but instead are connected to a receiver or amplifier. Thus, the amplifier, the speaker between the amplifier and the subwoofer, or the subwoofer itself could be the issue.
Things You'll Need:
* Amplifier * Speaker cable * Extra subwoofer
Disconnect the speaker cable from the back of the Bose Accoustimass bass module and connect it to a subwoofer that is known to be working. If the subwoofer works, the bass module needs to be replaced.
Disconnect the speaker cable from the back of the receiver or amplifier you are using and from the back of the subwoofer in Step 1.
Connect a speaker cable that is known to be working between the back of the receiver or amplifier and the back of the Accoustimass module. If the module starts working, then the cable was the issue.
Disconnect the speaker cable from Step 3 from the back of the amplifier or receiver, then connect the cable to the subwoofer port on the back of an amplifier or receiver that is known to be working. If the subwoofer works, the receiver was the issue. If the subwoofer still does not work, verify that the speaker cable is in the subwoofer port of the receiver/amplifier and that the cable is connected securely to the subwoofer.
If you think you did the connection properly,Fine... If not you can use the manual from the below link and know how to connect it properly..
I was trying to find an owner's manual or picture of the rear panel of the sub, but had no luck. The subwoofer is a powered type - or "active" speaker. This means it has a built in amplifier. These active subs usually provide for one or both "low level" and "high level" inputs. Low level signals are usually carried by shielded coaxial cables and have RCA type plugs on the end. The low level is also called "line level". This is an un-amplified signal that might be heard on cheap earphones - but that's about it. It is similar to the output of a tape deck, DVD or phonograph. These signals require an amplifier to be heard. If you have a sub woofer output on your receiver or amplifier, you could run a patch cable between the low level input on the subwoofer and the subwoofer output of the amp or receiver. You receiver or amp may call this output "low frequency effects" or similar. The front and rear speakers would then connect directly to the receiver or amp's corresponding connections.
If you lack low level outputs on the amp or subwoofer, you'll need to run speaker wires from the amplifier or receiver's front left and right speaker output terminals to the subwoofer's high level input terminals. High level signals are speaker connections or amplified signals. These are typically connections that accept bare wire connections. The front speakers would then connect to the subwoofer's front left and right speaker output terminals. The rear speakers connect to the amplifier.
Is the subwoofer a self-powered unit? If yes, it would have a minimal voltage showing on a meter. If the input is a line input, it would not have a problem taking in a line output (not speaker - never!) from your receiver. If the only output you have from your reciever is a speaker out, then purchase an L-Pad type speaker to line matching transformer. You can also take one of the input channels coming from the source and Y out a side to the sub pre receiver, but you then you would need to be able to adjust levels on the subwoofer independently from the receiver.
On the back of the amp, there should be a jack with the name "SUBWOOFER PRE OUT". It is a standard RCA jack, but it only puts out a line output, meaning only self-powered subwoofers will work with it. Usually, if the subwoofer does not have an amp, it will have 2 imputs and 2 outputs. You plug the two left and right inputs into the front speaker jack on the amp, and then plug the front speakers into the left and right amp on the 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.
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.
Most AV receivers do not have a built in amplifier block to drive a subwoofer, and merely provide the subwoofer output channel at line voltage. Thus, a powered subwoofer is required.
Does the subwoofer require mains power? From your description, I'm guessing it doesn't.
If not, it does not have a buit in amplifier, you will need to purchase a monoblock amplifier, which is just a mono amplifier with a volume control, no tone controls or anything else. Make sure that the amplifier power rating is as close as possible to the subwoofer power rating, as it is quite possible to blow a speaker by using an amplifier whose power output is too low, by overdriving the amplifier , and putting DC through the voice coil when the amplifier clips.
If it does require mains power, it will have an amplifier built in, but does not have line level inputs.