Talk Composites - The Forum for Advanced Composites

Newbie - Advice on material selection - Speaker enclosure

http://www.talkcomposites.com/Topic10470.aspx

By ta_sjo - 3/23/2014 7:50:54 PM

Hi there

I'm a complete composites noob. I've never glassed anything in my life, but have some experience watching!

I need to create an irregular-shaped speaker enclosure to go in my car, a sub-woofer box. Most car audio guys just tape up the area, wax it up, and start to lay the chopped stranded mat into place.. sometimes strips of normal glass and layer it up.. usually these end up about 10mm thick..

Problem is, for a sub-woofer enclosure, you need it very rigid so that it doesn't flex as this loses you efficiency and sound quality.

I have a fairly lightweight car so want to add as little weight as possible.

I would be keen to hear some recommendations on the best type of composite to use to keep the weight down whilst creating a very rigid enclosure... I have noticed the bi-axial glass cloth..

Here's a photo of the boot... the top of the enclosure will be routed MDF.. and possibly a frame around the edge so probably just the bottom/irregular section composite..




Thanks in advance for any responses Smile
By Fasta - 3/25/2014 11:47:39 AM

This shape you have will be stiff.




Do as others have done with packing tape and wax but don't make it 10mm thick. Maybe 3 layers of 450gm chop strand mat.

If you wanted to take it to the next level then consider using a thin 2mm coremat (not soric) with a 450gm chop strand each side.




That shape will be strong due to all the curvature.