Materials for absorption panels

Why do you want to reflect some/most of the mid and treble? If you want bass traps, panels will not work unless they are very large and very thick. Panels are typically used for damping the reflection points in the room, and should be good at absorbing a full range of frequencies.

I want to try a similar set up to the 8th Nerve stuff, corners and seams.
I realise that for the 1rst reflection points, I don't need to worry about reflection but the idea of filling my small room full of huge bass traps does not thrill me.
Also notice that a lot of bass traps have two absorbent sides and two partially reflecting sides.
I've tried very large, very thick panels and they just kill the mids and highs.
To give a better reasoning for this project, 4 mini traps cost nearly £1,000 to buy hear, hence the diy approach.
Thanks Simon

First, you need to distinguish between bass(y) traps that are really for lower midrange to upper bass unless montrous and absorbent panels for slap echo and first reflection. For bass, the most effective places are the corners, any corners and bulk is necessary to get them to work low. For the others, free-standing or wall-mounted panels of 2+" thickness are useful, with or without some HF reflection.

If you read the info at www.realtraps.com, there is lots of useful information and the products are good. Another source of information is www.rivesaudio.com. I've used panels and materials from Auralex, ASC, EchoBusters and http://www.sensiblesoundsolutions.com/

Kal