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Old 24th July 2012, 06:23 PM   #1
diyAudio Member
Join Date: Jul 2012
Default Ghettoblaster help

First a little background

This is an old samsonite briefcase

inside it has a Sure 11141-112v100 (2x 100 watt) amp
a battery

2 polk db401
2 polk mm651
1 old pioneer horn that while connected is mostly for looks

a few relavant pics (too large to attach)

I have run into a couple issues recently and I am not sure what the problem is...

1) should the cooling fan on the amp be always on? or is it temperature controlled? It does not seem to run at all on mine (maybe the root of my issues?)

2) I notice that over time while it plays it gets quieter but if you bump it a bit the volume picks back up. Initially i thought this could be a battery problem but I had it at the beach the other day and a little bump would crank the volume right back up which wouldnt make sense if the battery was out of charge?

Any ideas about this would be much appreciated


Last edited by hansolosays; 24th July 2012 at 07:09 PM.
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Old 24th July 2012, 06:52 PM   #2
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Saturnus's Avatar
Join Date: Jun 2005
Location: Copenhagen, Denmark
1) The amp will never get hot enough for the fan to turn on when you're only supplying it with 12V. It's also only outputs 2x15W on 12V, mind you.

2) You have a lose connection. Probably one of the signal wires needs replacing.
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Old 24th July 2012, 07:08 PM   #3
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Join Date: Jul 2012
Ok thanks I'll rewire it and see if it helps.
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Old 24th July 2012, 07:15 PM   #4
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one more quick question... Could the speakers magnets proximity to the crossover be affecting it?
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Old 24th July 2012, 07:43 PM   #5
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Osvaldo de Banfield's Avatar
Join Date: Dec 2011
Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
If it is near the bass filter (coil), and it has magnetic core, then the magnet will saturate it causing unlinearity and distortion.
Osvaldo F. Zappacosta. Electronic Engineer UTN FRA from 2001.
Argentine Ham Radio LW1DSE since 1987.
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Old 15th September 2012, 12:28 PM   #6
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Join Date: Jul 2012
ok so it has been running pretty well but the other day i noticed a a really high pitched whine / distortion coming out of the tweeters this happened before when I was using it outside a a thunder storm came through turned it off for a bit and it was gone.....but the other night it seemed to stick around through a few power cycles...

Any ideas?
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