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Old 01-29-2013, 11:28 AM   #1
i102spd
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Question Replaced stereo, now speakers distort

I replaced the factory HU several years ago with a mid-grade Pioneer unit, no problems at all. I added an alpine amp and sub using RCA's to it and all was working great. It's been several years now like that and I had no complaints. But I wanted to use my iPod so I bought a new mid-grade Pioneer HU with a front USB port. Both units put out the same power, should be a simple swap. And it was. Pioneer wiring harness was nearly identical to the one being replaced, and I soldered all connections.

Problem is now with the new unit if i turn the volume up at all the speakers start distorting like they're blown. They can't be, they were working just fine the day before. At low volumes it's fine, and if I fade to the rear speakers then I can raise the volume without distortion. Once I try to fade more towards the front the distortion all around kicks in.

The new radio has a high pass filter and sub filter, so i set the sub at 80hz, and the regular speakers at 100hz. Obviously I'm missing a range in there, but I did this to get it at least acceptable for the moment, I can’t drive in silence. I'm at a loss to why the fronts won’t play right when moments before the swap they were fine. I'm going to double check the connections i soldered, maybe just maybe i swapped one speaker wire with another, who knows. Any thoughts would be appreciated.

edit: I should add, the new HU has a setting to completely disable the sub, so I tried that too, and even with the sub completely out of the picture (however RCA's still connected) it's still giving the same probelm.
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Last edited by i102spd; 01-29-2013 at 11:32 AM. Reason: additional info
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Old 01-29-2013, 01:00 PM   #2
luan87us
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Sound like a problem with the EQ settings. I also would suggest to test with the amp+sub removed/disconnected instead of disabling it through the HU.
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Old 01-29-2013, 03:04 PM   #3
CRAZYHAWK
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Might the new HU be driving the amp with too much input causing clipping?
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Old 01-29-2013, 03:26 PM   #4
LIChuck
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Sounds like you have a bad HU. The front speakers should not cause the rears to distort.
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Old 01-29-2013, 07:43 PM   #5
cruz-in
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i would pull head unit and check wiring.

1. pull rear speaker cables from hunit and test
2. pull front speakers cables from unit and test.

only because it costs no money to do, only time
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Old 01-29-2013, 10:49 PM   #6
Mike 01Hawk
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Does it do it with Radio/CD? iPods have an built in EQ that you can adjust, I have no idea how that works though when they're plugged into a HU.
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Old 01-30-2013, 10:30 AM   #7
i102spd
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Thanks for the ideas guys.

This is happening no matter the source, whether it be the radio, CD or iPod. Far as I know the HU ignores any iPod settings when it's plugged into the USB and just uses it as a data source.

Tonite or tomorrow i'm going to try all of these out and see what happens. Fingers crossed i just mixed up a wire somewhere in my rush to get it done the other nite.
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Old 01-30-2013, 10:38 AM   #8
blessthekellen
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Highpass filter on.
Loud setting OFF.
Take the EQ off of "dynamic" or "bassboost" if its on those and go to "flat" then adjust your Eq curve yourself.
You are not running an amp to your speakers correct? just sub? If you have an amp to your speakers, try turning the gain down as this new headunit probably has higher pre-out voltage.
Double check your connections on your front speakers at the back of the headunit.


Pretty much all I can come up with.
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Old 01-30-2013, 05:39 PM   #9
hariria001
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Are you running stock speakers? Based on the other things you've put into your system I would assume not but that could be your issue if you are. +1 for check your wiring and check to make sure that the new harness is truly set up as your old one. In my car black is the only color that matches between the car and my aftermarket harness so make sure that's not all you're going by.
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Old 01-31-2013, 09:53 AM   #10
i102spd
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So after all that, it was as simple as a bad connection. I couldn't isolate which one, but originally when I wired it, after soldering each one I wrapped the speaker wire pairs together, wrapping one piece of tape around the first wire and then adding the 2nd wire and wrapping both, if that makes sense. One piece of tape but for 2 wires. In my hurry, it wasn't my best soldering job though, with stray little wires sticking out on some like little needles. My guess is one of those poked through the tape and made contact with it's sister wire. End of the day I cleaned up the connections, and each wire is taped individually and now it sounds even better than the old HU.

Even though I haven't been very active here in some time it's nice to know you guys are always willing to help. Thanks.

Last edited by i102spd; 01-31-2013 at 10:31 AM.
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Old 01-31-2013, 10:15 AM   #11
i102spd
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deleted duplicate post
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