I had the same problem. It is a loose conection on the print. The Amp unit goes into failsafe mode. You can check the Rc control. You are only alowed to turn it on and off. No signal regulating.
The solution is to remove the backside, and check the print for bad connections or even broken parts.
I experienced one leg on a transistor tha had broken.
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It's not clear if this has EVER worked or what is new in the scenario. The STR manual has setup instructions for supporting a sub. If you want to prove the sub itself works you could jack any source like, say, a CD player, into it to prove its amp will respond BUT IT WILL BE LOUD if it works.
If it makes any sound at all the speaker is probably not blown, the connections are probably on and the fuse is ok.
You don't say to what it is attached and if the setup for bass/lfe managament settings produce the same or a different result than program material does.
You also don't say how the sub is driven (speaker level or Line Level) and if it's a full-range or low-frequency-only input. All these things matter, as does your source electronics and its settings for bass management.
Try setting the low-pass higher and the high-pass lower.
The manuals would be a good place to start. Go to retrevo.com.
That model is known to have issues with the amps.Your problem is caused by a couple of components on the board shorting out.If you pull the amp out you will find on the large board behind the speaker terminal a couple of burned components.
The easiest fix is to buy a Bash 300w amp from Parts Express and replace the original amp.The Bash amp fits pretty well except that it is about an inch shorter.You can fill the hole with some mdf and have a sub that actually performs better than the original and with less heat build up as it is digital.Hope this helps,it's not complicated really.
Please verify that we're talking about a JBL PSW-D110 here. I'm making no assumptions.
Are you running the Ipod into its L & R RCA jacks as prescribed?
Have you tried it with something besides the Ipod? A sub isn't supposed to reproduce a full range signal. Come to think of it, is the Ipod even outputting anything within the sub's operational range? I don't expect a lot of real bass comes out of one.
Perhaps you could try adjusting the Low Pass up to 180 to see if anything anywhere near the 'real' bass region is present.
Bottom line: There's not a lot of need for a sub (and no other speakers) running off of any music sound source. You wouldn't hear anything above 180hz.