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Mid / High amps getting HOT!


RobertK

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So, I have a tiny system compared to most of you all. 

2007 Silverado classic crew cab. Stock alt, (130 amp) Batt in front only.  CCA 4 gauge and 8 gauge power wires running to under rear seat.

Big 3 or 4 upgrade done with CCA 1/0 wire.

Pioneer dbl din AVH-1330NEX head unit

Real 8 awg wire going to Alpine 45X4 rms power brick to rear doors / Kenwood 3 way 6.5's. (For fill, running maybe 30 watts)

4 gauge going to BB 900x1 amp powering 2 Sony 12" 300 watt rms shallow mount subs parallel to 2ohms.

8 gauge (4 gauge ground maybe?) going to Pioneer 150x2 rms amp powering Polk Audio 6.5 separates, 1" tweeters, and passive crossovers.  (Rated at 100 watts rms, 300 max) In front doors.

 

Bass amp stays cool to warm, would guess I'm running it around 600 to 700 watts maybe.

Mid amp, now Pioneer 150x2, (old amp was a Fosgate prime 125X2) Gets very hot, even turning gain down to what I guess is maybe 100x2.  The Fosgate amp also got very hot, which is why I switched to the Pioneer.

 

 

I'll check the ohms tomorrow. (Can you check ohms on component speakers on a passive crossover?)

Can the amps heat up that much because of small 8 gauge wire?

Can it be from 8 gauge positive, 4 gauge ground?  (I think it's 4 gauge ground.)

Anything else to check?

 

I could run 1/0 welding wire to the back seat, then split to dual 4 gauge I guess.  How can I prove that will solve the problem?

 

And no, I'm not going any higher amps, I just want this to run cool / warm, and reliable.  It's loud enough for me, and my budget!

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Class A/B amps run hot.

As long as it doesn't shut down it is normal, you can make a box to hold it with an opening on both ends and put a fan on one side to pull air through to cool it.

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10 minutes ago, Skullz said:

Class A/B amps run hot.

As long as it doesn't shut down it is normal, you can make a box to hold it with an opening on both ends and put a fan on one side to pull air through to cool it.

Hot enough that you can't touch it more than a second or two???

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15 hours ago, RobertK said:

Hot enough that you can't touch it more than a second or two???

Yes A/B amps get hot as hell mine does too

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Mine have all ran hot but as long as they don’t shut off just  let them ride.

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8 minutes ago, ToNasty said:

I disagree.  Ive had/have many class a/b amps. They get warm but not hot.  Class a amps get hot

Everyone has different experiences I guess..All my class A/B's have gotten hot after decent play time...Not boiling hot but hotter than lukewarm

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Best solution to your problem ... get you a matching Pioneer Amplifier if they can be run mono channel. Run one mono left, and one mono right. Double Power supply setups let’s you gain lower, play stronger, run cooler, and most important ... maximum left and right separation. Simple ....

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  • 1 month later...

So, as a follow up.  Nothing I did would keep that pioneer even remotely cool.  I even turned down the gain to about 60 watts per channel, and it still got too hot after an hour of cranking it.

 

I finally bought a new class D amp on amazon, that was dyno'd at over 350 watts x 2 at 4 ohms, figuring I can hopefully run it at 150 watts x 2 and keep it cool. 

 

So far, by using the formula for voltage output (ohms law, lol)  I'm putting out 200 watts x 2 at 4.2 ohms, and my front speakers are still begging for more!  I'm leaving it as is right now, till I get a DD1 meter, but I'm at 32 out of 40 on my head unit, all is very clear and loud, and no heat out of the bass or mid/highs amp.  So we will see.

 

Still need new power wire ran, and a little more bass, but very happy at the moment, especially when the mid / high amp was only $114 new.   The bass amp is also class D, 800 watts x1 currently, and only paid $50 used. 

 

 

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