Help me i my amp gets really hot

[cyberkidd007]

I dont know witch forum to post this in but here goes. i have a BOGen c 35b amp. i have a 300 watt sub, and 2 100 watt pioneer speaker. there all 4 ohms i think. my amp will go to 4.5 ohms and up. HOw should i hook this up? soory if this is confusing
THanx

'KiD

[tpenguin]

It's fairly normal for amps to get really hot, unless they are Class D or G. This is be cause amplifiers (with the exception of the Digital and hybrid digital amplifiers) are very inefficient devices, outputting more heat energy than electrical energy. Although, they are however more efficient than loudspeaker drivers typically by one or two orders of magnitude. So, for every watt of sound energy your system puts out, it also puts out 200 watts of heat or more (including speaker drivers). It is not uncommon for amplifier heatsink temperatures to exceed 75&degC, and unless you can't hold your fingertip against the heatsink for 5-10 seconds without feeling a great deal of pain, then it should be ok. Now, if your system is actually overheating to the point that it shuts off because of a protection circuit, or the sound becomes extremely distorted, you might want to add one or two very small, quiet AC cooling fans to the heatsink, which will increase its cooling capabilities many times.

[cyberkidd007]

yeah after 3 songs it almost shuts off 5 and OFF it goes. So is there a way that i can re wire it to make it not as hot? or is the fan all i can do?

[tpenguin]

I don't know anything about that amp in particular, but if it supports a minimum of 4-4.5Ohms impedance, and your speakers have a nominal impedance of 4 ohms, they could potentially dip as low as 2 ohms under certain conditions and overload the amp. If this is the case, I don't know if extra cooling will be enough, and you may risk damaging your amp if its components are not rated for the power output they are producing. I would suggest you post about it in the solid state forum. I'm sure somebody there knows something about Bogen amps.

[djmiddelkoop]

Do you mean this amp ?

http://www.marvac.com/products/bogen...5%20C60%20C100


Does it also get hot when the speakers are disconnected and/or no music is played thru the amp ?

If your answer is yes, you should have someone check it out.

Dick.

[cyberkidd007]

yes it is pretty mmuch like that. Just not the classic one. BUt only when i have alot of bass does it get hot. im pretty sure its because of it pulling to much power from amp. is there a way to fix this?

[tpenguin]

Originally posted by cyberkidd007
yes it is pretty mmuch like that. Just not the classic one. BUt only when i have alot of bass does it get hot. im pretty sure its because of it pulling to much power from amp. is there a way to fix this?

You might want to look for an autoformer. It will allow you to multiply the impedance "seen" by the amp, and that way will allow you to cut the ammount of power the speaker can draw. I've never used one, and I can't say what kind of effect it will have on sound quality, or what is the best one to get. You can find one
here, but I can't really endorse it or any other. All I know is that if your speakers are overloading your amp because of their low impedance, an autoformer should fix it.

[djmiddelkoop]

Yes,
I agree with tpenquin,
however I think if you have to spend money to fix it, I'll rather buy another amp or speakers.

[OMNIFEX]

Originally posted by cyberkidd007
I dont know witch forum to post this in but here goes. i have a BOGen c 35b amp. i have a 300 watt sub, and 2 100 watt pioneer speaker. there all 4 ohms i think. my amp will go to 4.5 ohms and up. HOw should i hook this up? soory if this is confusing
THanx

'KiD

Wire the Pioneer's in series (Raising the Impedance
to 8 ohms) Connect it to the 8 ohm Tap.

Connect the Sub to the 4 ohm Tap.

OR (The obvious solution)

Buy A Fan, and mount it on the Heat Sinks.


To be honest you should find out the Impedance
of those speakers.

JMHO