Fan in a speaker box, bad idea?

MikeHunt79 · 10th December 2009, 11:30 AM

I ask as speaker cones move air, and so do fans.

I'm bi-amping, and am putting the amp module within the speaker box. I guess they'll be active speakers now.

I've upgraded the heatsink on my amp but it still gets a little hot... Would putting a low speed fan on the heatsink affect the sound from the speaker in any way?

The speaker boxes are simple reflex designs, FWIW.

Charles Darwin · 10th December 2009, 12:26 PM

Wouldn't it be easier/better just to keep the amps outside of the box?

The small (compared to the room the speakers are in) amount of air inside the box is already being heated up by the voice coils (which in itself leads to the dreaded power compression) and adding amps on the inside can only make things worse, nevermind any fans.
If the fan would be aimed to exhaust through the reflex port I can well imagine that it might change the resonance with further detrimental effects.
If the fan is NOT aimed to exhaust through the port I fail to see any advantage of having it at all in the long run (ie if you run the speakers at volume for a while) as it would just end up circulating already hot/warm air.

DigitalJunkie · 10th December 2009, 02:18 PM

Can you position the heatsinks to be near the ports? The air moving in/out of the port should help with cooling.

yangbaibing · 10th December 2009, 02:49 PM

If you want to put the amp module in the box, please let the heatsink out of the box.

10th December 2009, 11:30 AM	#1
MikeHunt79 diyAudio Member Join Date: Aug 2003 Location: Bristol, UK	Fan in a speaker box, bad idea? I ask as speaker cones move air, and so do fans. I'm bi-amping, and am putting the amp module within the speaker box. I guess they'll be active speakers now. I've upgraded the heatsink on my amp but it still gets a little hot... Would putting a low speed fan on the heatsink affect the sound from the speaker in any way? The speaker boxes are simple reflex designs, FWIW.

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10th December 2009, 12:26 PM	#2
Charles Darwin diyAudio Member Join Date: Nov 2009 Location: Birmingham, UK	Wouldn't it be easier/better just to keep the amps outside of the box? The small (compared to the room the speakers are in) amount of air inside the box is already being heated up by the voice coils (which in itself leads to the dreaded power compression) and adding amps on the inside can only make things worse, nevermind any fans. If the fan would be aimed to exhaust through the reflex port I can well imagine that it might change the resonance with further detrimental effects. If the fan is NOT aimed to exhaust through the port I fail to see any advantage of having it at all in the long run (ie if you run the speakers at volume for a while) as it would just end up circulating already hot/warm air.

10th December 2009, 02:18 PM	#3
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	Can you position the heatsinks to be near the ports? The air moving in/out of the port should help with cooling.

10th December 2009, 02:49 PM	#4
yangbaibing diyAudio Member Join Date: Dec 2009 Location: chengdu china	If you want to put the amp module in the box, please let the heatsink out of the box.

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