ATC SCM20ASL aluminium enclosure, rings like a bell!

Puggie · 23rd January 2006, 12:55 PM

I have a pair of these apart at the moment as they needed the XLR replacing due to damage. The back/side of the cabinet is a large aluminium casting (it double up as the amp heatsink). now once you have removed the stupidly heavy drivers and (MDF) front baffle, you are left with this aluminium casting which rings like a bell. the cabinet is heavily stuffed with long haired wool and once the baffle is in place the aluminium section seems quite inert, but I cant help thinking a layer of sound deadening to dampen the ringin may help things.

any thoughts?

Nappylady · 23rd January 2006, 01:19 PM

If it were me, I'd use the stuff Parts Express ships with woofers--speaker sealing caulk, I think is what they call it--'cos I've got tons of the stuff lying around

and when I performed a similar trick on the inside surface of a computer case that was resonating, it killed the resonance quite effectively.

Puggie · 23rd January 2006, 03:58 PM

Well I have some automotive 'liquid sound deadening' at home, paint it on and it dries to leave a latex based dead layer, about 0.8mm thick (anything thicker and it take weeks to dry).

could this have any adverse effect on the sound though, to be fair once you have clamped the baffle on it doesn't ring as you have locked the 'edge of the bell' to a single piece of dead MDF

pinkmouse · 23rd January 2006, 04:02 PM

I wouldn't worry if I were you. My cast ally JBLs when in pieces are also very musical, but once together, don't ring at all.

23rd January 2006, 12:55 PM	#1
Puggie diyAudio Member Join Date: Oct 2004	ATC SCM20ASL aluminium enclosure, rings like a bell! I have a pair of these apart at the moment as they needed the XLR replacing due to damage. The back/side of the cabinet is a large aluminium casting (it double up as the amp heatsink). now once you have removed the stupidly heavy drivers and (MDF) front baffle, you are left with this aluminium casting which rings like a bell. the cabinet is heavily stuffed with long haired wool and once the baffle is in place the aluminium section seems quite inert, but I cant help thinking a layer of sound deadening to dampen the ringin may help things. any thoughts?

23rd January 2006, 04:02 PM	#4
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	I wouldn't worry if I were you. My cast ally JBLs when in pieces are also very musical, but once together, don't ring at all. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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23rd January 2006, 01:19 PM	#2
Nappylady diyAudio Member Join Date: Feb 2003 Location: Salt Lake City	If it were me, I'd use the stuff Parts Express ships with woofers--speaker sealing caulk, I think is what they call it--'cos I've got tons of the stuff lying around and when I performed a similar trick on the inside surface of a computer case that was resonating, it killed the resonance quite effectively.

23rd January 2006, 03:58 PM	#3
Puggie diyAudio Member Join Date: Oct 2004	Well I have some automotive 'liquid sound deadening' at home, paint it on and it dries to leave a latex based dead layer, about 0.8mm thick (anything thicker and it take weeks to dry). could this have any adverse effect on the sound though, to be fair once you have clamped the baffle on it doesn't ring as you have locked the 'edge of the bell' to a single piece of dead MDF

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