Sand filled 2 way

1fspd · 21st March 2012, 05:04 AM

I'm building a sealed two way and before I put blade to wood, I thought I'd ask for opinions/thoughts on the sand filled cabinet walls vs a stack lamination construction.

The sand filled speaker has interior/exterior side and back walls of 3/4" MDF. Font baffle, top and bottom are a 1.5" MDF/dampening/MDF layer sandwich. Exact dampening material remains undecided.

I've never used sand in a cabinet before, but in theory seems great. Stack lamination/translam type enclosures also seem interesting.

Wanted to try something a little different.

Thoughts?

planet10 · 21st March 2012, 05:21 AM

I'm not a big fan of translam... makes pretty shapes but has lots of drawbacks

The sand filled willbe monstrosuly heavy, but has been shown to be VERY effective dating all the way back to Briggs.

As well either construction will be better (i think substantially) if you use good plywood instead of MDF.

dave

Lusk · 21st March 2012, 07:31 AM

How about doing both? I did a base enclosure with stacked layer and lead shot that worked very well, need a trolley to move it though.

dublin78 · 21st March 2012, 09:54 AM

Quote:

I'm not a big fan of translam... makes pretty shapes but has lots of drawbacks

What drawbacks? Interested.

1fspd · 21st March 2012, 01:34 PM

Lusk - cool idea. I considered something similar... a column (top-bottom) of sand just to either side of the driver in the attached stack lam model. Thought it would be a way of separating driver vibration from the rest of the cabinet, without adding significant weight.

Planet10 - I also like the look of stack lamination speakers, but am inclined to think the sand filled cabinet would perform better...but i've never built either so appreciate your input - thanks

I've heard of cracking issues with stack lamination designs - A solution to MDF expansion on joints, translams etc.

fastbike1 · 21st March 2012, 04:26 PM

2 1/4" layers of plywood separated by cement board for sides and back w/ a double layer of plywood on the baffle will do as well as sand and be lighter (not light, but lighter).

Use one of the construction panel adhesives to glue the cement board to the plywood and you've got contrained layer construction. Should handle panel resonance just fine.

21st March 2012, 05:21 AM	#2
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 5	I'm not a big fan of translam... makes pretty shapes but has lots of drawbacks The sand filled willbe monstrosuly heavy, but has been shown to be VERY effective dating all the way back to Briggs. As well either construction will be better (i think substantially) if you use good plywood instead of MDF. dave __________________ community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

21st March 2012, 04:26 PM	#6
fastbike1 diyAudio Member Join Date: Aug 2009 Location: North Texas, USA	2 1/4" layers of plywood separated by cement board for sides and back w/ a double layer of plywood on the baffle will do as well as sand and be lighter (not light, but lighter). Use one of the construction panel adhesives to glue the cement board to the plywood and you've got contrained layer construction. Should handle panel resonance just fine. __________________ I was so much older then, I'm younger than that now.

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21st March 2012, 07:31 AM	#3
Lusk diyAudio Member Join Date: Jan 2010 Location: Melbourne	How about doing both? I did a base enclosure with stacked layer and lead shot that worked very well, need a trolley to move it though.

21st March 2012, 01:34 PM	#5
1fspd diyAudio Member Join Date: Nov 2010	Lusk - cool idea. I considered something similar... a column (top-bottom) of sand just to either side of the driver in the attached stack lam model. Thought it would be a way of separating driver vibration from the rest of the cabinet, without adding significant weight. Planet10 - I also like the look of stack lamination speakers, but am inclined to think the sand filled cabinet would perform better...but i've never built either so appreciate your input - thanks I've heard of cracking issues with stack lamination designs - A solution to MDF expansion on joints, translams etc.