help on dampening please

welly_59 · 22nd November 2003, 10:22 AM

hi guys, i've just finished building the speakers attached below, but was wondering where i should place dampening material inside. I've bought the damping material already but am not sure if it needs to be placed in both enclosures or not. Also where in the cabinet should i mount the crossover? thanks a lot for your help

rabbitz · 23rd November 2003, 01:44 PM

For a vented enclosure I tend to put damping on the back, top and sometimes one side only but for this I'd put it on the bottom instead of the top. For the sealed upper box, fill it up. Wack the crossover on the back wall near the speaker terminal and seal the wiring going into the upper box.

That's a very wide baffle. How thick's the MDF - can't read the sketch real well.

welly_59 · 24th November 2003, 09:36 AM

the mdf is 18mm thick. What do you mean by saying the baffle is too wide?

rabbitz · 24th November 2003, 01:21 PM

I'm not saying it's too wide as you need this width to fit that huge woofer.

The question on the MDF thickness was to see what was used. I'd add some bracing or stiffeners as you want a solid support for the woofer.

welly_59 · 25th November 2003, 08:45 AM

theres a brace going along the back at about 300mm, shoul i add more?

rabbitz · 25th November 2003, 02:35 PM

Put some in from the front right to the back panel and also glued to the sides, bottom and top. Will help the sides as well. Also glue some blocks where your speaker screws go into the baffle so the screws go through the baffle and also into the blocks.

See the marked up sketch.

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23rd November 2003, 01:44 PM	#2
rabbitz diyAudio Member Join Date: Jul 2003 Location: Newcastle, Australia	For a vented enclosure I tend to put damping on the back, top and sometimes one side only but for this I'd put it on the bottom instead of the top. For the sealed upper box, fill it up. Wack the crossover on the back wall near the speaker terminal and seal the wiring going into the upper box. That's a very wide baffle. How thick's the MDF - can't read the sketch real well.

24th November 2003, 09:36 AM	#3
welly_59 diyAudio Member Join Date: Nov 2003 Location: swansea	the mdf is 18mm thick. What do you mean by saying the baffle is too wide?

24th November 2003, 01:21 PM	#4
rabbitz diyAudio Member Join Date: Jul 2003 Location: Newcastle, Australia	I'm not saying it's too wide as you need this width to fit that huge woofer. The question on the MDF thickness was to see what was used. I'd add some bracing or stiffeners as you want a solid support for the woofer.

25th November 2003, 08:45 AM	#5
welly_59 diyAudio Member Join Date: Nov 2003 Location: swansea	theres a brace going along the back at about 300mm, shoul i add more?

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