Originally Posted by jhumur
I have a 8-yr-old home theater setup that's been working just fine, but about a month ago I realized that the subwoofer (Polk PSW10) wasn't putting out any signal. The receiver is the Pioneer VSX-1120-K.
Now, the SUB gets power, and the driver doesn't seem to be damaged. (It'll make a humming sound, for example, when I loosely connect the RCA cable to the SUB and move it around.) But when I run the MCACC calibration on the receiver, it won't find the SUB. Doesn't matter if I have the speakers set to SMALL or not. MCACC will send out test signals at the start of the calibration routine, find the front and center speakers but not the SUB. So, it'll automatically set the speakers to LARGE and run the cal.
I'm starting to suspect that the problem lies with the receiver, that it isn't putting out a subwoofer (preout) signal. Another reason i suspect this is that when I put the SUB power switch to the middle position (AUTO), the power indicator stays yellow. If the SUB was receiving a signal, it'd turn green. I have replaced the cable thinking maybe that was the problem, but it hasn't helped. So, now i have to figure out what's really going on, and I was hoping you guys could give me some ideas on how to diagnose my problem.
Thank you for your help.
I'm still using my old pioneer AVR as well.
But I did have a similar thing happen when the unit was new. One day, for no apparent reason, sub just would not work, no matter what I did.
Mine is something like 1018, the last of the THX certified AVRs from that time with full 7.1 pre out's.
Lucky for me, at the time, my AVR was still under warranty and I was able to get the sub pre out fixed. Bad solder joint or something.
So it could very well be that the pre out has died and you have to decide if it is worth repairing or upgrading now.
From my perspective, upgrading to a unit with full pre out's and THX processing is a couple of grand now. I scored the AVR for less than 800 at the time and even though it is only HDMI 1.3, it has served me well.
Good luck and I hope it is an easy fix.
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