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Old 07-04-2013, 09:48 AM   #61
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OK, quick and easy troubleshooting exercise - move the wires from the rear speakers to the front channels and the front speakers to the rear channels. Does the problem shift, or do the rear speakers still distort?
Sorry it's been so long. I've been super busy with work and stuff and my radio works fine without an amp but I'd like to finally figure this out. When I switch the front and rear channels the problem shifts to the front. What does this mean?

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Old 07-04-2013, 09:55 AM   #62
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It means that the problem is in the amp, not the speakers. Do you have all gain controls turned to their lowest level, and all filters turned off?

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Old 07-04-2013, 10:02 AM   #63
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Thanks for the quick reply! Switching the inputs has no effect. No matter what channels I connect the RCAs to its still only the rear speakers. I can also make just the front speakers work. by switching the speaker wires to the 2 "good" channels.
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Old 07-04-2013, 10:09 AM   #64
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Thanks for the quick reply! Switching the inputs has no effect. No matter what channels I connect the RCAs to its still only the rear speakers. I can also make just the front speakers work. by switching the speaker wires to the 2 "good" channels.
Yeah, I edited my post because I realised you said that all four channels off the head unit are good when the speakers are directly wired, but you were too fast for me.

Clearly the speakers and the wiring are good, so the problem is in the amp. Make sure all gains are set to minimum and all filters are off. If it's still not working, I can only think that there's a problem with the amp.
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Old 07-04-2013, 10:13 AM   #65
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Thanks for the quick reply! Switching the inputs has no effect. No matter what channels I connect the RCAs to its still only the rear speakers. I can also make just the front speakers work. by switching the speaker wires to the 2 "good" channels.
Not completely following, but if you post up what amplifier you have, and it's 2ohm stable, you could hook up the FR and BR in parallel and the FL and BL in parallel and use just the good outputs. You wont have any fade control though.
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Old 07-04-2013, 10:15 AM   #66
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Yeah the gains are all the way down and no filters. Is there any way I can save my amp, or should I just toss it? Would wiring all 4 speakers into the 2 channels work? Essentially giving me a 2 channel amp.
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Old 07-04-2013, 10:19 AM   #67
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Yeah the gains are all the way down and no filters. Is there any way I can save my amp, or should I just toss it? Would wiring all 4 speakers into the 2 channels work? Essentially giving me a 2 channel amp.
You can do that, either by doing it as noog says or by going FL/FR and RL/RR in parallel and sacrificing balance. Your amp (Alpine MRP-300) is 2ohm stable, so there's no problem doing that; if the amp's new, though, I'd send it back and have it replaced under warranty.
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Old 07-04-2013, 10:29 AM   #68
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You can do that, either by doing it as noog says or by going FL/FR and RL/RR in parallel and sacrificing balance. Your amp (Alpine MRP-300) is 2ohm stable, so there's no problem doing that; if the amp's new, though, I'd send it back and have it replaced under warranty.
I wouldn't wire it like this though, because your stereo source would sound really f'd up being Front and back instead of left and right.
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Old 07-04-2013, 10:30 AM   #69
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The warranty says damage due to incorrect wiring is not covered and I'm sure I messed something up along the way. I'll just run them in parallel and sacrifice ballance. Fade is more important to me anyway. If I do fry my $40 amp further I'll just upgrade when I do my sub in the future.
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Old 07-04-2013, 10:33 AM   #70
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The warranty says damage due to incorrect wiring is not covered and I'm sure I messed something up along the way. I'll just run them in parallel and sacrifice ballance. Fade is more important to me anyway. If I do fry my $40 amp further I'll just upgrade when I do my sub in the future.

There isn't anything you really could have done wiring the speakers that would fry it --- it has a protect mode to prevent that. Return it.

The problem with wiring such that you don't have balance, is that your right channel is now the front (or rear) and your left channel is now the rear. It makes for awkward listening.
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Old 07-04-2013, 10:36 AM   #71
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There isn't anything you really could have done wiring the speakers that would fry it --- it has a protect mode to prevent that. Return it.
Agreed, although if you read back in the thread some of the original wiring was a bit funky. Not sure that there was anything that would have caused damage though, and even then they'd need to prove that you wired it incorrectly. Send it back and get a new one, don't try and kluge it on two channels unless you have no choice.
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Old 07-04-2013, 10:48 AM   #72
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They want me to pay a $20 fee to return my $40 amp for a refurbished one. Thats just not worth it to me. I'll just use this one as a single channel amp for my sub and buy a better one for the speakers. Trust me it won't be a Boss audio one. I guess you really do get what you pay for.
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Old 07-04-2013, 11:01 AM   #73
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So, when you get a sub -- get a dual voice coil with 4 ohms at each coil and wire in parallel then bridge the output of the good channels
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Old 07-04-2013, 11:03 AM   #74
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Old 07-04-2013, 11:09 AM   #75
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They want me to pay a $20 fee to return my $40 amp for a refurbished one. Thats just not worth it to me. I'll just use this one as a single channel amp for my sub and buy a better one for the speakers. Trust me it won't be a Boss audio one. I guess you really do get what you pay for.
Just realised that you didn't buy the Alpine, you got a Boss Audio on my recommendation.

redface.jpg

In my defence I've done a Boss amp before in a friend's Civic and it's still happily bumping along a couple of years later. Still, charging you to replace it under warranty is bullshit.

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