So I picked up this old Alpine Amp at a yard sale.
07-13-2009, 04:38 PM
#1
So I picked up this old Alpine Amp at a yard sale.
I guess I'm enamoured with old car audio stuff...
It is a MRV100M Subwoofer amplifier, buddy also had a cheap sub trying to pawn off on me but when I tried the "push" test the voice coil was welded tight! So then I got my new amp home and bench tested it. Powered on okay but no output... I opened her up and found one of the output paths on the circuit board blown like a fuse! My guess is the guy had a cheap sub go into meltdown and caused a zero impeadance on the amp, and because the output on the amp doesn't have fuses it went pop! I've jumpered the affected sections on the board and it seems to work.
So my question is, Does this sound like what happened or am I completely off base? also should I put fuses on the speaker out terminals like on my old fosgate gear?
Jason.
It is a MRV100M Subwoofer amplifier, buddy also had a cheap sub trying to pawn off on me but when I tried the "push" test the voice coil was welded tight! So then I got my new amp home and bench tested it. Powered on okay but no output... I opened her up and found one of the output paths on the circuit board blown like a fuse! My guess is the guy had a cheap sub go into meltdown and caused a zero impeadance on the amp, and because the output on the amp doesn't have fuses it went pop! I've jumpered the affected sections on the board and it seems to work.
So my question is, Does this sound like what happened or am I completely off base? also should I put fuses on the speaker out terminals like on my old fosgate gear?
Jason.
07-14-2009, 09:00 PM
#2
I guess I'm enamoured with old car audio stuff...
It is a MRV100M Subwoofer amplifier, buddy also had a cheap sub trying to pawn off on me but when I tried the "push" test the voice coil was welded tight! So then I got my new amp home and bench tested it. Powered on okay but no output... I opened her up and found one of the output paths on the circuit board blown like a fuse! My guess is the guy had a cheap sub go into meltdown and caused a zero impeadance on the amp, and because the output on the amp doesn't have fuses it went pop! I've jumpered the affected sections on the board and it seems to work.
So my question is, Does this sound like what happened or am I completely off base? also should I put fuses on the speaker out terminals like on my old fosgate gear?
Jason.
It is a MRV100M Subwoofer amplifier, buddy also had a cheap sub trying to pawn off on me but when I tried the "push" test the voice coil was welded tight! So then I got my new amp home and bench tested it. Powered on okay but no output... I opened her up and found one of the output paths on the circuit board blown like a fuse! My guess is the guy had a cheap sub go into meltdown and caused a zero impeadance on the amp, and because the output on the amp doesn't have fuses it went pop! I've jumpered the affected sections on the board and it seems to work.
So my question is, Does this sound like what happened or am I completely off base? also should I put fuses on the speaker out terminals like on my old fosgate gear?
Jason.
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