Because most of them in there are made of foam - and questionable foam at that. There are some decent ones there but nothing that you can't do cheaper DIY.
Materials for absorption panels
Hi there,
trying to build some diy panels.
Need a material for the front of the compressed fibreglass that will reflect 'some'/most of the mid & treble.
Also does the likes of Muslin definitely contain the fibreglass - don't want any floating around in my listening room.
I notice 8th Nerve use a sort of foil/scrim material.
Real traps are a conundrum as if they are open at the sides to allow the edges to contribute to the efficiency they cannot be a sealed/tuned box so I assume the 'membrane' covers the whole fibreglass panel inside.
Si
trying to build some diy panels.
Need a material for the front of the compressed fibreglass that will reflect 'some'/most of the mid & treble.
Also does the likes of Muslin definitely contain the fibreglass - don't want any floating around in my listening room.
I notice 8th Nerve use a sort of foil/scrim material.
Real traps are a conundrum as if they are open at the sides to allow the edges to contribute to the efficiency they cannot be a sealed/tuned box so I assume the 'membrane' covers the whole fibreglass panel inside.
Si