amp goes into protection mode

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mastermindz

Copper - Posts: 70

Joined: December 17, 2009

Location: California, United States

Posted: March 29, 2010 at 10:53 PM / IP Logged

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??

Mastermindz

j.reed

Copper - Posts: 716

Joined: January 05, 2009

Location: Arkansas, United States

Posted: March 29, 2010 at 11:10 PM / IP Logged

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?

amp goes into protection mode -- posted image.

mastermindz

Copper - Posts: 70

Joined: December 17, 2009

Location: California, United States

Posted: March 30, 2010 at 12:15 AM / IP Logged

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

Mastermindz

j.reed

Copper - Posts: 716

Joined: January 05, 2009

Location: Arkansas, United States

Posted: March 30, 2010 at 12:27 AM / IP Logged

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.

mastermindz

Copper - Posts: 70

Joined: December 17, 2009

Location: California, United States

Posted: March 30, 2010 at 12:30 AM / IP Logged

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

Mastermindz

j.reed

Copper - Posts: 716

Joined: January 05, 2009

Location: Arkansas, United States

Posted: March 30, 2010 at 12:42 AM / IP Logged

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?

mastermindz

Copper - Posts: 70

Joined: December 17, 2009

Location: California, United States

Posted: March 30, 2010 at 12:57 AM / IP Logged

K thanks I'll look into that

Mastermindz

i am an idiot

Platinum - Posts: 13,667

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: March 30, 2010 at 2:46 AM / IP Logged

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.

prvteyez

Member - Posts: 13

Joined: March 15, 2006

Posted: March 30, 2010 at 8:36 AM / IP Logged

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.

mastermindz

Copper - Posts: 70

Joined: December 17, 2009

Location: California, United States

Posted: March 30, 2010 at 12:05 PM / IP Logged

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

Mastermindz

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