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In Reply to: aluminium cooling plate/access panel on horn subs posted by roborg on September 19, 2005 at 08:58:24:
Go over to http://srforums.prosoundweb.com/ and read up on all the background info on the LAB Sub project. In a nutshell the idea works, if you get the aluminum panel in very close to the back of the vented magnet.
Anything that produces a leaky rear box volume in a horn design is VERY bad for performance, don't do it.Best regards,
John Halliburton
Follow Ups:
A heatsink doesn't work all that well when the mode of coupling it with the heatsource is convection. The very air that separates the driver from the heatsink is, after all, an insulating medium. Having the plate very close to the frame helps, but that also may result in a smaller chamber that in itself contributes to heat build up. Go to PSW and AudioRoundTable and check out the threads by Wayne Parham re: his design for a heatsink that is coupled to the driver frame.
Bill,I'll agree, it's not the most efficient mode of heat transfer, BUT it is significantly better than not having anything but a vented driver in a sealed rear chamer to a horn.
Best regards,
I'll agree it's better than nothing as far as long term heat build up is concerned, but better than nothing isn't much more than eye candy. It looks really cool on the access panel of a CV Earthquake and gives salesmen something to talk about, but it won't do much to instantly wick away the heat from a 2kW transient. I don't think Wayne's solution is necessarily the best route either, because it attacks the heat problem by trying to cure the symptom rather than the cause. Tom's redux on the Scoop is a more elegant way of beating the heat. Having the motor sitting in the airstream of the mouth is a neat way of keeping it cool without any add-ons, and opens the possibility of using a true heatsink fastened directly to the backplate with heat-conducting epoxy.
In the airflow in ambient surroundings-one key point you needed to include in the description of Tom's latest. I have been impressed by how warm the aluminum plates on Labhorn subs get, there is definitely some good transfer of heat happening there.
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