Acoustic Panel, rear side with sheet of masonite, efficiency loss ?

[Soulgolem]

Hi I've been making acoustic panels 2x4' for a while for my practice room and studio with great success using rockboard 40 material.

I started building them for some friends lately and one asked if I could cover the back end with masonite (thin flexible hardwood material often used in the back of drawers and computer desks).

It's very do-able, I can just buy a sheet and nail it to the back side of the panel, but would it have a dramatic effeciency loss ? Those panels are usually hung to the wall.

 

[drfrankencopter]

Hi I've been making acoustic panels 2x4' for a while for my practice room and studio with great success using rockboard 40 material.

I started building them for some friends lately and one asked if I could cover the back end with masonite (thin flexible hardwood material often used in the back of drawers and computer desks).

It's very do-able, I can just buy a sheet and nail it to the back side of the panel, but would it have a dramatic effeciency loss ? Those panels are usually hung to the wall.

Zero loss if you were planning on flush mounting to your wall, and only minimal loss if you were going to space it from your wall. One benefit of using masonite (or hardboard) on the the back of the panel is that if your room is too dead, you can flip the panel around and brighten it up while still having the panel work as a membrane bass trap.

Cheers

Kris