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 Post subject: McIntosh amp probs.
PostPosted: Sun Sep 28, 2003 2:59 pm 
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Joined: Mon Jul 22, 2002 8:58 pm
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Location: KCMO
I have a McIntosh 4 channel amp. 50Wx4 Was given to me a long time ago. I opened it up and the main power trace on the board was melted. I resoldered it and now the amp works. Problem is that it works with only two inputs. I have two tens hooked up bridged to channels 1&2, 3&4. It puts out a rythmic thump thump thump over the music if i plug the signal inputs into channels 3&4. 1&2 sound fine. What could be causing this? Is it fixable? I looked this amp up on the web and seems to retail for over $1200. :o

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 Post subject:
PostPosted: Sun Sep 28, 2003 4:52 pm 
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Location: England
$1200 for a 4x50watt? They're usually pretty much free here :)

Sounds like PSU dead, or if it's a shared PSU between the amps then the amps dead. Sounds like a typical amp fault, oscillating at a low frequency.

Chances are someone has shorted the output, blew an amp chip which fried a track as well.

If you want it fixed, give me a PM, I built my own last year.


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 Post subject:
PostPosted: Sun Oct 12, 2003 8:46 am 
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Something else strange. I noticed that i have bass coming only from one channel. High freqs from the other three. Swapping inputs around changes nothing. This thing booms from one channel tho!

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04' Olds Alero
91' Colt GL hatchback
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4g37 TB, MAF & Injectors. 4g37 ECU
Ported & polished & custom CAI w/K&N filter
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89 GT brake and suspension swap
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 Post subject:
PostPosted: Mon Nov 22, 2004 4:25 am 
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Joined: Fri Oct 22, 2004 4:55 pm
Posts: 430
Location: Los Angeles, California
mc's were once one of if not the best amps around. old school ones are pretty much priceless


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 Post subject:
PostPosted: Mon Nov 22, 2004 4:56 am 
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Joined: Sun Oct 10, 2004 6:17 am
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Location: Calgary,Alberta
I'd bring it to a reputable electronics tech,and have it repaired.
Mac is the shiznit!!

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 Post subject:
PostPosted: Thu Dec 23, 2004 11:02 am 
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Joined: Tue Dec 21, 2004 2:10 pm
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Location: Cold State Of MN
Sounds like your circuits are crossed in your amp. By switching the input tells you that your freq. is messed up in your amp. If you really like the amp I would take it in and get it repaired. It might be cheaper just to buy a new amp.


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