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Old 23rd April 2009, 06:08 AM   #1
chipper is offline chipper  United States
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Default Why does my amp run hot?

I have a kicker ZR240 (i replaced my old one that blew) anyways it runs pretty hot after awhile of play time. I'm using it on some 6x9 speakers in the back with the proper impedence crossovers connected to them and i've checked and checked all the wiring everything seems good. It just gets hot even with 4 ohm stereo. Could the amp be bad?
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Old 23rd April 2009, 08:28 AM   #2
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What are you using for crossovers?

Does the amp heat up if you power it up and let it idle (no audio output)?
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Old 23rd April 2009, 10:40 PM   #3
chipper is offline chipper  United States
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Quote:
Originally posted by Perry Babin
What are you using for crossovers?

Does the amp heat up if you power it up and let it idle (no audio output)?

I'm using kicker reslution impedence crossovers

Yes it does get very warm with no music playing.

The thing is i don't understand the previous ZR240 i had did the same thing??

I also had read reviews that these were "know for running hot".
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Old 23rd April 2009, 10:43 PM   #4
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If it's getting hot with no audio, the bias may be set too high.

Disconnect the speaker wires from the amp. If it still heats up, the bias is very likely too high and needs to be adjusted.
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Old 24th April 2009, 12:44 AM   #5
chipper is offline chipper  United States
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Quote:
Originally posted by Perry Babin
If it's getting hot with no audio, the bias may be set too high.

Disconnect the speaker wires from the amp. If it still heats up, the bias is very likely too high and needs to be adjusted.

What is the bias? I don't see no other adjustable control besides the gain.
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Old 24th April 2009, 12:47 AM   #6
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Did the amp heat up with no speaker wires connected to the speaker terminals?
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Old 24th April 2009, 01:08 AM   #7
chipper is offline chipper  United States
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Quote:
Originally posted by Perry Babin
Did the amp heat up with no speaker wires connected to the speaker terminals?

On idle? Yes it did.
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Old 24th April 2009, 07:55 AM   #8
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To check the bias/idle current, you'll need to measure the DC voltage across the emitter resistors (large resistors with red, red, silver, gold bands). It should be near 0.001v at idle.

What do you have on the side of the amp with the transistors marked Q14/Q16?

On the side with Q30/Q32?

I'd recommend that you replace the two 30 amp fuses with a single 10 amp fuse. This will help protect the amp if you make a mistake (probes slipping...).
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Old 24th April 2009, 08:35 AM   #9
Westerp is offline Westerp  Netherlands
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Just stop worrying and read some reviews online.

These cheap and under dimensioned amps get hot period.
Something which says 60+60 watt on the box might
be able to supply around 20+20 real watts and when
you connect 4 ohm speakers you can only expect it to
heat up and prolly distort as well
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Old 24th April 2009, 10:11 AM   #10
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I could have sworn his amp was heating up WITHOUT a speaker connected to it. I too vote for a bias problem.
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