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I get no sound from my speakers with amp/pre-amp setup

I get no sound from my speakers with my Anthem MCA-50 amp / Integra DHC-9.9 processor setup. However, I do ''hear'' some low level white noise when the speaker is connected to the amp via the binding post. I've tried connections with unbalanced RCA audio cables and balanced XLRs between amp and pre-amp without success.

Here is what I've already tried:
1 - Amp does indeed have power
2 - Checked the 2 fuses attached to the amp, they look brand new
3 - Used different cables between amp and pre-amp (both balanced XLR and unbalanced RCA)
4 - Used different sources to test for audio, i.e., DVD, CD, tuner -- no sources result any sound thru the speakers

I still believe it's a connection problem between amp and pre-amp. But am not sure what else to rule out.

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  • shawnmandel Apr 18, 2009

    Thanks very much for your suggestions. This unfortunately confirms that it is probably a transistor output stage problem since I get no sound still when attempting to listen to a CD via digital coax connected directly to the amp.

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Hi Shawnmandel,

As you have already confirmed the fix, If the output transistor(s) are defective you must replace both of them. While at it, might as well replace the transistors in the good channel, too, as they may be ready to give up the ghost, in this case.

You can also close this thread by selecting 'Fixya'...


Thanks for using Fixya.

Do rate the solution as 'Fixya" if 100% satisfied................

Posted on Apr 18, 2009

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If the Amp (the MCA-50 amp / Integra DHC-9.9) has no sound out apart some low level static on all conditions, then it is likely a faulty amp because the amp final transistors had blown.

To start unplug all connections from the Amp, and unplug home theater from power for five minutes to reset it .
Test a CD unit on TV to ensure it has sound, and then connect to the amp using no pre amp, digital input connection for audio only, then play an audio cd, see:Digital Audio Connection (Coaxial).
If you still get no sound browse manually the source, but it should be selected automatically when you start DVD unit.

If still no sound under the conditions above, then amp is faulty.

If instead the amp works on conditions above, then test placing the preamp in the middle (CD/DVD signal is already pre amped, you would not need this, unless you want to use preamp graphic equalizer or similar functions). If it does not work this way , then the pre amp must be tested.

Posted on Apr 18, 2009

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