Defective HU or Amp?

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allencass

Member - Posts: 37

Joined: June 17, 2005

Location: Massachusetts, United States

Posted: February 04, 2006 at 10:29 PM / IP Logged

Hello,having some trouble with my stereo. 2005 durango with basic hu feeding an infinity 5760a 6ch amp, hooked up to polk speakers in the doors and a box in the back. when i turn the radio up past 10 or 11(goes up to 38 on the dial) the amp will cut out, and slowly come back on, but if i keep it at that level it immediately shuts down again so i have to turn volume down to 5 or 6. this will happen even if i have had the car off all night and have just powered the amp so it is not a matter of overheating. looking for opinions, defective amp or hu? amp is about 1-1/2 years old and again hu is the basic hu from dodge(didn't want anybody trying to steal anything). thanks for any help you can give me.

Allen

sedate

Silver - Posts: 1,173

Joined: July 03, 2004

Location: Colorado, United States

Posted: February 04, 2006 at 10:35 PM / IP Logged

allencass wrote:

the amp will cut out, and slowly come back on, but if i keep it at that level it immediately shuts down again so i have to turn volume down to 5 or 6.

What do you mean by 'slowly coming back on'?

"I'm finished!" - Daniel Plainview

allencass

Member - Posts: 37

Joined: June 17, 2005

Location: Massachusetts, United States

Posted: February 04, 2006 at 10:42 PM / IP Logged

after about 3-5 seconds, the volume will slowly start to rise to whatever level i have it set on.

sedate

Silver - Posts: 1,173

Joined: July 03, 2004

Location: Colorado, United States

Posted: February 04, 2006 at 10:51 PM / IP Logged

but as soon as it returns to that volume it cuts back out again?

"I'm finished!" - Daniel Plainview

allencass

Member - Posts: 37

Joined: June 17, 2005

Location: Massachusetts, United States

Posted: February 04, 2006 at 10:55 PM / IP Logged

it cuts out again if i have the volume up at the 10-12 range. if i turn it down, it will normally stay on. it usually happens when bass is supposed to hit, but if i put on talk radio it seems a little better.

blackmica3

Copper - Posts: 128

Joined: August 07, 2005

Location: United States

Posted: February 04, 2006 at 11:04 PM / IP Logged

I've had this problem before. It turned out I had a bad ground to the amplifier. Check your ground on the amp and make sure you have a clean metal to metal contact.

allencass

Member - Posts: 37

Joined: June 17, 2005

Location: Massachusetts, United States

Posted: February 04, 2006 at 11:10 PM / IP Logged

checked ground already but it can't hurt to try again and rescrape some metal.

Alpine Guy

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Joined: October 18, 2003

Location: Canada

Posted: February 04, 2006 at 11:24 PM / IP Logged

Could be gain is way too high on the amp, or the impedance of the speaker/subs could be too low for it to handle. Or possibly a short in the speaker wires, or possibly a speaker. You said if there is a bassy song it will cut out, whell you could have a shorted out voice coil. There is sooooooooooooooooo many possibilitys, its just a matter of hours of trial and error.

2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.

sedate

Silver - Posts: 1,173

Joined: July 03, 2004

Location: Colorado, United States

Posted: February 04, 2006 at 11:31 PM / IP Logged

Yea, Alpine Guy is right here...

Basically, somewhere in your output stage you're shorting out somewhere.. perhaps a Voice Coil is shorting at excursion and that is why that specfic volume level is giving u trouble.

First step:

Disconnect speakers one at a time and see if the other three will play at that level w/o reproducing that problem... if it does.. you found your shorting speaker...

Prolly not a short in the speaker wire tho, that would prevent the amp from playing at all..

Try a new ground, try checking each speaker by process of elimination.. post back with results eh?

Did this problem just start or has it been this way since installation?

"I'm finished!" - Daniel Plainview

allencass

Member - Posts: 37

Joined: June 17, 2005

Location: Massachusetts, United States

Posted: February 04, 2006 at 11:43 PM / IP Logged

will try the suggestions, just started happening, system installed for about 6 months. will post back with results

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