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amp goes into protection mode

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=121068
Printed Date: May 14, 2024 at 8:40 PM


Topic: amp goes into protection mode

Posted By: mastermindz
Subject: amp goes into protection mode
Date Posted: March 29, 2010 at 10:53 PM

I have a 1800 watt kenwood amp pushin a 15" kicker L7, and after about a few minutes of bumpin, the amp goes into protect mode for about a minute and then comes back on, what causes this and how can I fix it or do I have to have it repaired??

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Mastermindz



Replies:

Posted By: j.reed
Date Posted: March 29, 2010 at 11:10 PM
First how about a model number to the amp, power and ground wire gadge and ohm of the sub? Is it a dual 2 or 4 ohm? Any other additions to the system?

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Posted By: mastermindz
Date Posted: March 30, 2010 at 12:15 AM
It's a kenwood 9103D class D 1800 watts to a kicker 15"L7 4ohm dual voice coil, and it's wired with 4 gauge ground/power wire, I also have an interfire 4 ch amp, clarion eq and jensen indash. The sub is wired to a 2ohm load on the amp. Also have a 8 farad Kole audio cap

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Mastermindz



Posted By: j.reed
Date Posted: March 30, 2010 at 12:27 AM
My first assumption would be gain set too high. Causing the amp to go into clipping enough to cause excess heat and to go into protect.

First lets assure your gains are set correctly. How to set gains sticky.

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Posted By: mastermindz
Date Posted: March 30, 2010 at 12:30 AM
Yes my gains are set to half and even lowering them still cause it to go into
protect mode and I've even redone my ground

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Mastermindz



Posted By: j.reed
Date Posted: March 30, 2010 at 12:42 AM
Grounds would have been next on the list, but it sounds like you may have a bad output transistor. "i am an idiot" would be the man to talk to. Unless someone else sees something im missing?

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Posted By: mastermindz
Date Posted: March 30, 2010 at 12:57 AM
K thanks I'll look into that

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Mastermindz



Posted By: i am an idiot
Date Posted: March 30, 2010 at 2:46 AM

Is the amp capable of driving a 2 ohm load?

J, Once an output transistor fails, it is done with.  It wil not work sometime and then go into protect randomly.  You also need to make sure that the amp is getting proper voltage.  The amp must be playing loudly when using the volt meter to check the voltage.  Black meter lead on the ground connection AT THE AMP.  Red meter lead on the power connection AT THE AMP.




Posted By: prvteyez
Date Posted: March 30, 2010 at 8:36 AM
silly question but, where do you have the amp mounted, and does it get enough air to keep it cool?. might sound a little simplistic, but start with the obvious first.



Posted By: mastermindz
Date Posted: March 30, 2010 at 12:05 PM
Yes the amp is able to handle 2 ohm, and I've checked the voltage and it ranges between 12-14 volts while playing, and I have both my amps mounted to the back of my box

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Mastermindz



Posted By: i am an idiot
Date Posted: March 30, 2010 at 7:18 PM
Vibration is the enemy.  I would not mount an amp on a box unless there was absolutely no other place to mount it.



Posted By: j.reed
Date Posted: March 30, 2010 at 9:49 PM
i am an idiot wrote:
Vibration is the enemy.  I would not mount an amp on a box unless there was absolutely no other place to mount it.


Do you think the excess vibrations could be causing the extra heat and causing the amp to over heat into protect mode? I know if a connection is not tight and allowed to vibrate/move around it can cause extreme heat. So in theory i could see this having an effect on it.

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Posted By: mastermindz
Date Posted: March 30, 2010 at 10:07 PM
I took my amp to a repair shop and it's my MOSFET power supply that's going out, what couldve caused this?

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Mastermindz



Posted By: porschedrifter
Date Posted: April 01, 2010 at 7:26 PM
Honestly, Even though this probably isn't the issue. For the amount of power you are pushing I would go with 2 gage instead of 4 gage wire.



Posted By: i am an idiot
Date Posted: April 01, 2010 at 7:51 PM
I would like to know what kind of equipment they have to tell that a Mosfet device is GOING out.



Posted By: icearrow6
Date Posted: April 02, 2010 at 1:28 PM
i am an idiot wrote:
I would like to know what kind of equipment they have to tell that a Mosfet device is GOING out.


I second that!!

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Posted By: DYohn
Date Posted: April 02, 2010 at 2:56 PM

i am an idiot wrote:
I would like to know what kind of equipment they have to tell that a Mosfet device is GOING out.

You can tell they're going out when they get all dressed up and put on their makeup and head towards the door.  posted_image



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Posted By: icearrow6
Date Posted: April 03, 2010 at 12:23 PM
DYohn] wrote:

i am an idiot wrote:
I would like to know what kind of equipment they have to tell that a Mosfet device is GOING out.

You can tell they're going out when they get all dressed up and put on their makeup and head towards the door.  posted_image



LOL.

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