takes awhile for amp to cut completely on

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Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=98505
Printed Date: May 17, 2024 at 9:27 PM

Topic: takes awhile for amp to cut completely on

Posted By: jmelton86
Subject: takes awhile for amp to cut completely on
Date Posted: October 31, 2007 at 10:34 PM

I have 2 JensenJPA285 (I know) 2channel (250x1 @ 4ohm, CEA) -each bridged to their own coil of my Boston G51044(dual 4ohm). It's getting about 500Wrms.

Anyway, when I turn them on it takes them about 15seconds to turn all the way on. It's like in steps -it gets louder in steps until all the way on.

Any ideas?

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2013 Kia Rio -90a alternator
DDX470HD GTO14001 GTO1014D (x3)
Big3 in 1/0G
1/0G to GTO14001

Replies:

Posted By: i am an idiot
Date Posted: November 01, 2007 at 6:03 AM

It takes that long for the Hamsters to mount the wheel and get it up to speed. It sounds like they may be using some kind of Soft-On technology. Common in some older more costly amps. But maybe since Audiovox bought them they may be trying some new things.

Posted By: coppellstereo
Date Posted: November 01, 2007 at 1:10 PM

Maybe try turning them on with a test tone playing - then you could hear/measure what is going on.

Could be the amp OR the headunit - how are your HU and amps connected? RCA or high level?

You might want to measure their output during the 'boot up' stage

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Posted By: ninefoot3
Date Posted: November 04, 2007 at 8:53 AM

Owned a Jensen (06 model) 4ch amp that took about 2-3 seconds to power on. I'd hear bass in all of it's solitude while my Jensen amp took it's time juicing up the rest of the speakers. Seems to be a characteristic of the beast.

I ditched it and got a 4ch Alpine. Sound is amazing in comparison. Even with a lower wattage rating.

Posted By: jmelton86
Date Posted: November 05, 2007 at 5:56 PM

i am an idiot wrote: It takes that long for the Hamsters to mount the wheel and get it up to speed.

Ahahaha! I thought it could be something like that!

coppellstereo wrote: Maybe try turning them on with a test tone playing - then you could hear/measure what is going on.

Could be the amp OR the headunit - how are your HU and amps connected? RCA or high level?

It does it with any music. I actually noticed it with a bass note that holds for awhile -I don't think it'd be as easy with rock or something...

RCA's. My other amp (ClarionAPA2104 -RCA's also) that long, or in steps.

I figure it could be some kind of soft turn-on thing -or crappy capacitors. (I don't know much about internals - if that sounds dumb!).

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2013 Kia Rio -90a alternator
DDX470HD GTO14001 GTO1014D (x3)
Big3 in 1/0G
1/0G to GTO14001