Question about Yamaha YST-SW1500 Subwoofer

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Hi,my sw1500 switches on, all thye lights work etc, but no sound comes out. The rca input is fine because another sub. works ok. Roger.

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I f you are sure that the inputs are fine ...and the selection of the input device is the right one ...and it's a computer that has no sound..check the configuration in the sound manager of the computer to see if the exit you have in there are the same with the ones you use..(I mean 2+1 or 5+1 ...etc )
usually if there is nothing physically wrong with the speakers..it is either the input messed up ..or if only some of the speakers work ..is either the amplifier chip for that channel ..or is the wrong configuration on the exit of the device to be amplified ..

Posted on Sep 29, 2010

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I have my Vizio hooked up to my computer. I have a sub-woofer and speakers. How do I get the speakers to work w/tv mode. They work when I am using computer mode. I have comcast cable and box.


Good day sir, Hi, you see, the TV produces its own sound, you need to feed this sound to your PC. here are options were you need to choose.
  1. You need a separate sub/speaker system for your TV. feed the sub/speaker with the sound line out from the TV. you also need an RCA to stereo baby plug adaptor for your sub/speaker.
  2. If you want to use your PC speakers, feed the line out of the TV sound to the line in of the PC, usually the line in is the blue port, you need an RCA to stereo baby plug. then activate the line in function from the mixer volume properties. This requires that you turn on your PC when in TV mode.
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  4. Does your sub has extra input? like aux, or cd, or tuner? feed the TV line out to one of these extra port. use the input selector switch from TV and PC. you need an RCA to stereo baby plug connector.
I forgot to ask, Does your TV has line out? if no, you are stuck with the built-in speakers.

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I've problem getting any Sub sound from Sony STR DB840. The sub is ok and I've correct setting on my reciever with sub enabled. When performing tone test... I can hear sound from all connected speaker...


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You don't say if you've configured the Receiver to know you have a subwoofer (under Multicontrol - SUBW YES). Unless it knows about the Sub it won't send anything out that single "preout". You can get an RCA splitter to run that single output to both inputs in the Sub.

Just as an experiment, temporarily run one a pair of cables from the REC OUT to the Sub's inputs and tune an FM station to prove the Sub amplifier is alive. If it's still silent, it's dead. If there is sound (muffled) you need to go back to the Receiver to figure out why the Sub Preout is signal-starved.

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hi there
on your CD deck or what ever unit you plugged the RCA wires to needs to be set on subs the radio needs to be set to put sound to your amp.....on your CD player if you press the F/function button a few times it will scroll to SW which is for the subs set this to the on position or if your CD player has a button with SW press it and turn on this feature......if this has been done......check the fuse or fuses on the amp.......if you have done all of the above check the back of the CD unit to make sure you are plugged into sub-woofer RCA or R (rear) RCA ..........sometimes people accidentally put the RCA wires into the aux input RCA,,,,,, double check this.........
hope this helps

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Can't get my amplifier to work.


Any idea how this is all wired up?
I think what they have may used is an 'RF modulator kit' to get the signal from your stereo to the amp. These are commonly used when factory stereo's don't have any outputs on the back of them for adding external amps. Even so, when you unplug the RCA cables there should be no signal coming to the amp & no sound coming out of the speakers/subs that are subsequently connected to the amp either.

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1 Answer

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since it still thumps i suspect the speaker is ok, but i suspect you have an electronic problem in the amp. since it is a powered sup & has the ability to auto turn on it has electronic circuits inside, take it to a service center for an estimate

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