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Heat problems!?

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TONY.A.S.S. View Drop Down
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    Posted: 22 December 2013 at 11:35am
Dave's always been a hard man to move.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Muckerbarnes1 Quote  Post ReplyReply Direct Link To This Post Posted: 22 December 2013 at 11:10am

Agree with Tony. A crazy problem too IMO. By the way here JBL is (junk but loud) seen as the same.

I have used Volt 15's in horn loaded sub many times. They worked for years. A great speaker. Sadly hard to get recone and drivers from David was a problem. They are not for stupid high power levels as some newer drivers. A new build Volt with a better coil assembly may help more.

Billy Dawg.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote To Old Now Quote  Post ReplyReply Direct Link To This Post Posted: 22 December 2013 at 10:53am
Has any one thought about the  Volt Driver where the frame is on the outside of the cab and not enclosed as other drivers are? Though that does depend on how much air travels over the frame to allow it to cool.
JUst a thought!!!!
You want it when?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SMP Quote  Post ReplyReply Direct Link To This Post Posted: 20 December 2013 at 8:19am
Well said Tony!!! but the "JBL Crew" ( Just Bloody Loud Crew) are are only interested in moving air it seems. They are not goona waste time considering things like Audio quality for the most part just how few cabs they need to do it  sadly
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tony Wilkes Quote  Post ReplyReply Direct Link To This Post Posted: 20 December 2013 at 7:00am
But you have to remember that for the heat to get into the magnet assembly first and hence to any connected structure it has to pass over a tiny but very important Air Gap.

Regardless of how many claims are made for advanced cooling of voice coils etc this fundamental weakness in the thermal flow cannot be overcome, at least with traditional methods.

Physically cooling the air in the cabinet to sub zero temperatures would probably make some difference but even then less than you would think.

What probably causes most of the early onset of thermal damage in the Punisher is simply that the movement of the cone is much smaller than normal due to the increased cone loading so that for example cone movement is probably 1/4 (Guess) what it would be in a reflex box.

The fact that it is also working in a tiny chamber acerbates the problem so that the poor air ventilation becomes extremely poor ventilation so the driver fails with seemingly less power than in a traditional box.
That said it is only probably 10-15% difference in the two scenarios.

Answer, simplzz, use two Punishers and only stick 500w up their arse's because you ain't gonna cure it with bits of "tin" no matter how clever you are.

Tony


Edited by Tony Wilkes - 20 December 2013 at 7:19am
www.forteaudio.eu - BMS - db-Mark Processors - Lexon (SAE)
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Post Options Post Options   Thanks (1) Thanks(1)   Quote TONY.A.S.S. Quote  Post ReplyReply Direct Link To This Post Posted: 20 December 2013 at 12:25am
I suppose if there was a leak, those using drain pipes for ports would be catered for.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bitSmasher Quote  Post ReplyReply Direct Link To This Post Posted: 20 December 2013 at 12:21am
Water pathways through a cast aluminium frame would make sense... if necessary
Originally posted by TONY.A.S.S. TONY.A.S.S. wrote:

many water cooled Lazers were used and it wasn't unusual to find bucket loads of water back stage, so sooner or later connectors give trouble
Neutrik to release a line of hydraulic fittings?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TONY.A.S.S. Quote  Post ReplyReply Direct Link To This Post Posted: 20 December 2013 at 12:01am
These days, the Frame is the Heat Sink.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mini-mad Quote  Post ReplyReply Direct Link To This Post Posted: 19 December 2013 at 10:05pm
NOW IV NEVER HAD A DRIVER GET HOT ENUFF TO KNOW.... DOES THE WHOLE DRIVER GET HOT? EVEN THE FRAME?


*poxy caps lock.


Edited by mini-mad - 19 December 2013 at 10:05pm
If it sounds like a gorilla is trying to escape, turn it down.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote odc04r Quote  Post ReplyReply Direct Link To This Post Posted: 19 December 2013 at 9:56pm
I reckon a throat heatsink is the best bet. Well cooled by airflow and the whole stack can cool as one. Even with no direct thermal contact to the driver it would probably be quite an improvement.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mini-mad Quote  Post ReplyReply Direct Link To This Post Posted: 19 December 2013 at 8:22pm
wat about a heat exchanger?
...i mean putting a "large" radiator inside the chamber with heat pipe running out side to another radiator with a 140-200mm fan.
a similar effect to how computer heatsinks work but on a larger scale. it could work quite nicely but would need some extensive testing.

im talking about cooling the air inside the chamber not the magnet. i.e lowering the ambient temp inside the chamber by a few degrees....... and the few degrees can be the diff. between a cooked coil and a hot coil.


Edited by mini-mad - 19 December 2013 at 8:25pm
If it sounds like a gorilla is trying to escape, turn it down.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote csg Quote  Post ReplyReply Direct Link To This Post Posted: 19 December 2013 at 8:18pm
peltier heat pumps would be ideal, being solid state with no liquid parts. having sufficient BTU would be the problem i suspect, but it would make a considerable difference.
“The fact is this is about identifying what we do best and finding more ways of doing less of it better”
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