Amp problem

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=46865
Printed Date: May 28, 2024 at 1:06 PM

Topic: Amp problem

Posted By: Sancho
Subject: Amp problem
Date Posted: January 04, 2005 at 10:07 AM

My friend has just installed new amp ...and it seems that strange noise going from speaker...and even if he connect rca or disconnect doesn't really matter cause there is no music coming out only this noise what kind of problem might be????

Thank You

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Head Unit:Alpine CDA 9835
6.5 MB Quart Pce 210
Amp:JBL 80.4
Amp:JBL 1200.1
Sub:Adire Brahma 12 MKII

Replies:

Posted By: DYohn
Date Posted: January 04, 2005 at 10:28 AM

What kind of noise? Is the engine running?

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Posted By: Paradigm
Date Posted: January 04, 2005 at 10:36 AM

My first thought would be alternator whine. But you'll need to give us more info to confirm that.

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VEHICLE: 2002 GMC Sonoma ZR2
Alpine CDA-7940
AudioControl EQT x2
JL Audio 1000/1
JL Audio 10W6 (originals) x3
Kicker ZR120
Kicker ZR460
Polk GXR-6 x4
Polk GXR-4 x2

Posted By: Sancho
Date Posted: January 04, 2005 at 3:55 PM

ok engine is not runnig...if i hook up rca nothing changes no sound at all ...only noise comming out

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Head Unit:Alpine CDA 9835
6.5 MB Quart Pce 210
Amp:JBL 80.4
Amp:JBL 1200.1
Sub:Adire Brahma 12 MKII

Posted By: DYohn
Date Posted: January 04, 2005 at 4:01 PM

Like I said before, WHAT KIND of noise? A hum? A whine? A whistle? A scratchy sound? Iron Maiden? What??

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Posted By: Sancho
Date Posted: January 04, 2005 at 4:55 PM

a whistle

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Head Unit:Alpine CDA 9835
6.5 MB Quart Pce 210
Amp:JBL 80.4
Amp:JBL 1200.1
Sub:Adire Brahma 12 MKII

Posted By: DYohn
Date Posted: January 04, 2005 at 5:22 PM

A whistle with no input to the amp is usually internal feedback due to gain set way, way too high, or in the case of a sub amp can also indicate that your low-pass crossover is off or set too high. Or, the amp can be fried.

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