ok to start off i have a 99 s10 ext cab, with a false floor in the back, under it is a saz 2K, and a 125.2. i started with only about 1" of air space above the amps before the floor, then i found out the 125.2 was getting soo hot i could not even touch it, but would never go into thermal (protect). also that was getting that hot within a 10-15min drive. i also found that it only got hot at high volumes. so today i raised the floor up 3/4" i have about 2" of air space now above the 125.2, i also added right beside the amp blowing over it, a 120mm and a 80mm fan, on the other end of the floor i have a single 80mm blowing over my 2K, as i found it really didnt get that hot. (its about 30-40 degrees with humidity over here). now on the drive home i found that within about 15 min the amp was getting pretty hot still. i have my amps on a relay, and i have the fans hooked up to the remote wire for the 125.2. im going camping this weekend coming up and my truck will be blasting music all weekend, so i want to get this cooling issue fixed before i leave. thanks!!

The 125.2 is a class AB amplifier. AB amplifiers tend to run warmer than a Class D.

Exactly what impedance is the 125.2 seeing?

If running at 2 ohms it will generally run hotter due to the lower impedance.

I would say if you can get the fans to keep the amplifier at a moderate temp you should have no issues. Also make sure you have adequate electrical to run your system without the engine running. May also want to cut some exhaust holes above the amplifier if applicable.

cant cut holes. i have 2 batteries running my set up, odyssey 1500 in front, 2150 in the back. and the 125.2 is seeing 4 ohm loads. i know it should run hotter, but i dont think it should be running that hot lol, also ive been told to redo the ground for it, so im thinking maybe doing a short ground straight to the frame of the truck

How hot is it getting? Too hot to touch?

A good solid ground can make a difference. Try that and go from there.

yes, so hot you have to take you can only touch it for a few seconds, so i think i may try a new ground first, any other suggestions?

a fan from a computer would help.

i already have 3 fans hooked up

The false floor may need to go, or like said above you may need to cut holes to bring in fresh air instead of circulating already hot air around

the false floor is just a piece of wood ontop of feet, both ends are wide open. and the floor cant go, no where to put the amps.

I have a suggestion, put a couple more fans and flush mount them onto the top board, put two pushing and two pulling, wire a relay and connect them to the relay so they can get plenty of power through your power and ground, instead of the HU power.

Find away to help the air escape out of the false floor area, redo the ground as you said before and check your connections as well. I would also make sure you have your gain settings set right, you may be have them to high which can cause excess heat as well.

gain is set at about 1/4 way. not even close to 1/2. so im pretty sure gain is fine, i can go full tilt and no distortion. i can not put fans into the floor, i put stuff on top, and if i ever build a new box (only running 2 8's right now) the box would cover the full floor, and cover the fans up. and to tell you the truth, these fans move some decent air, i dont think thats really the problem. all connections are good and solid, other then the ground, its running about 3.5 feet long, with a coupling between (was short when installing) so its either the ground, or like you guys say, air movement. if thats the case i think i will have to turn the 1 80mm fan, and make it blow out from under the floor. and if i have to add a 2nd 80mm (dont really want to, loud enough with the fans i have in now).. also everything is on a relay right now, so everything is getting powered off the relay not right off the h/u power.

Edited August 11, 201015 yr by Hostility

Check the ground - if that is good and the amp is not shutting off it's fine. Those do run warm / hot - especially when it's hot outside.

Some amps run hot under normal operating conditions. You could almost fry and egg on the old style Rockford amps and that was normal for them.

isn't your 2150 right now to your amp? and why didn't you ground directly to the battery since it is so close?

isn't your 2150 right now to your amp? and why didn't you ground directly to the battery since it is so close?

the 2150 is on one side of the truck, where the ends of the amps where the connections are, are on the other end, shorter to just ground to the frame. but i will make 1 solid short ground for the 125.2 straight to the frame, and if it still gets warm then it is what it is i guess, but never once has it shut off on me, but damn did it ever get boiling hot lol

want to fry your hand ?

try blasting a genesis dual mono or dmx