Amplifier overheating

[sicro 10+ year member]

I have a Magnat amplifier (http://www.car-sound.ro/The_Rock_800-p234.html) used in the 3 channel mode, powering 2 SAL speakers, which have aprox. 50W rms each, wired in paralel with 2 no name tweeters (+4.5 condensators) and a Dibeisi subwoofer ( i have no ideea how many W it has..max. 150rms) in bridge mode.

It seems it doesnt like me very much as it overheats and turns off in aproximately 10-15 minutes of use. When i disconnect the subwoofer things seem to be fine.

Does this happen because the speakers are too small for this amplifier? Or why?

Click to read more...

 

[azbass 5,000+ posts]

what impedance do you have the woofer wired at, at teh amp?

 

[sicro 10+ year member]

4ohms...i have measured the impedance myself and it's 4..

 

[sicro 10+ year member]

It's mounted vertically on it's side, the wires are 8GA, the ground is fine i think, you can't really say the air is moving over it, but it has the entire trunk to cool, bass boost is @ about 3db, gain-aproximately 90% and the subwoofer has 4 ohms impedance.

 

[helotaxi 5,000+ posts]

The gain and bass boost are your problems. Turn the bass boost to 0 and then give it a try. I've got a feeling that your gain is too high as well.

 

[sicro 10+ year member]

Ok, gonna try tomorrow.I set the gain to about half and the boost to 0.

 

[sicro 10+ year member]

It seems you were right, after resetting the bass eq and the gain it doesnt power off anymore. However, it still gets kind of hot, possibly also due to the low quality speaker. Anyway, problem solved, thanks for your help!