To the experts, I am thinking of making a panel like this:
Build a 60cm wide X 120cm pine frame or 60cm X 140cm or maybe bigger like 120cm to 240cm, working from the back of the panel -> 9mm MDF back support -> 90mm rockwool -> 100mm airgap -> thin sheet of plywood or ivory cane-ite (refer to http://www.chhwoodlogic.com.au/Product/Overview/0,2297,27,00.html ) --> 50 or 100mm fibreglass -> polyester batting (maybe to hold the fibres) -> 10mm airgap -> 5-9mm perforated or pegboard melamine sheet -> cloth to cover the panel (maybe)

Will this work as a bass absorbent panel? What frequencies do you think I'l get? What would I need to modify this design to make it work well for low frequencies. I made this using the design principle of:
- this one big panel is equivalent to like putting two panels on top of each other against the wall, basically two different types of panels in one panel
- different density and materials will weakin the sound as it travels through the panel I made
- Using the plywood, cane-ite or pegboards as resonators for the panel
- Air gaps in between to allow for better absorption.

I am about to build this, please give me your input if this will be a waste of time. I was going to put Sonex on top of the pegboard instead of the cloth. Think of this design like a hamburger, I am trying to make one with the lot with all the ingredients I've been given.

Here is the list of materials I have that I am trying to utilise:
sonex 50 and 100mm
- mdf 9mm and 18mm
- pine wood 2 X 4
- cane-ite board
- standard pegboard
- plywood 3mm & 5mm
- rockwool 88mm
- Acoustic Fibreglass batts 50mm
- polyester batting
- hessian (burlap)
- silicon sealant
- liquid nails


Ta