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Old 05-15-2016, 01:10 PM
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Help with sound issue

Hi there,

So just recently i upgraded my sound system in my jeep with all alpine equipment.

I went with the CarPlay iLX head unit, PDR-V75 amp, SPR-60C speakers, and an 8 inch sub. I'm also using the PAC RP4 interface.

When i first installed the system it all worked perfectly, and the sound was fantastic, but now after about 2 months of having it, im getting really bad feedback. It sounds almost like a turbo whistle coming from the right front speaker, and the pitch changes as the engine RPM changes. I'm now also getting the sound dropping out from one side, then coming back and dropping out from the other side.

I've checked all the connections on the head unit, the amp, the speakers, and the PAC, and everything is good and tight. Also, don't know if it matters but the amp is mounted in the cubby hole under the drivers seat.

Anyone have any ideas what might be causing this?

Thanks!

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Old 05-15-2016, 02:49 PM
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Re: Help with sound issue

Quote:
Originally Posted by Dannyboy83 View Post
Hi there,

So just recently i upgraded my sound system in my jeep with all alpine equipment.

I went with the CarPlay iLX head unit, PDR-V75 amp, SPR-60C speakers, and an 8 inch sub. I'm also using the PAC RP4 interface.

When i first installed the system it all worked perfectly, and the sound was fantastic, but now after about 2 months of having it, im getting really bad feedback. It sounds almost like a turbo whistle coming from the right front speaker, and the pitch changes as the engine RPM changes. I'm now also getting the sound dropping out from one side, then coming back and dropping out from the other side.

I've checked all the connections on the head unit, the amp, the speakers, and the PAC, and everything is good and tight. Also, don't know if it matters but the amp is mounted in the cubby hole under the drivers seat.

Anyone have any ideas what might be causing this?

Thanks!
Where did you ground your amp? Are you using quality, double twist RCA's? Unfortunately, this is not going to be much fun troubleshooting as it could be a number of issues. Therefore start with the easiest location to access, which is probably your amp. Make sure the signal wires (RCA's) coming in are not running along side the power wire for your amp. If that's all good then disconnect your RCA's and see if the whine goes away. If it does, then your amp is good and the problem lies in your rca's and/or head unit. If not then you may have a bad ground for your amp. Try this and update
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Old 05-15-2016, 03:36 PM
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Re: Help with sound issue

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Originally Posted by bioneck47 View Post
Where did you ground your amp? Are you using quality, double twist RCA's? Unfortunately, this is not going to be much fun troubleshooting as it could be a number of issues. Therefore start with the easiest location to access, which is probably your amp. Make sure the signal wires (RCA's) coming in are not running along side the power wire for your amp. If that's all good then disconnect your RCA's and see if the whine goes away. If it does, then your amp is good and the problem lies in your rca's and/or head unit. If not then you may have a bad ground for your amp. Try this and update
Awesome, thanks for that.

The amp was grounded back on the batteries negative terminal. The RCA cables are not the best ones, but there not rubbish either. They do however run next to the amps power wire for about 6 inches, would that be enough to screw with it? I guess i'll have to re-route some of the wires then.
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Old 05-15-2016, 04:28 PM
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Re: Help with sound issue

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Originally Posted by Dannyboy83 View Post
Awesome, thanks for that.

The amp was grounded back on the batteries negative terminal. The RCA cables are not the best ones, but there not rubbish either. They do however run next to the amps power wire for about 6 inches, would that be enough to screw with it? I guess i'll have to re-route some of the wires then.
Yes it definitely could be that. You also want your ground wire to be as short as possible and attached to the chassis, but if that's not your problem then I wouldn't worry about that, but it could be considering the neg terminal is a "noisy" ground.

If you want to verify that it is your rca's then you could also get a cheap set and run them externally directly from your amp to head unit away from any power wires. Another thing you could try is wrapping the cables with aluminum foil in the location where they run along side the power wire to see if that eliminates the noise. I wouldn't leave it that way though, just another tip to see if your power wire is introducing noise into your system.
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Old 05-16-2016, 01:43 AM
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Re: Help with sound issue

Awesome, thanks for the help!
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