Choice of insulation & fabric for diy panels?

[spaceape]

Originally Posted by Ethan Winer

I got your PM, thanks for posting in the public forum. Though you're not making this easy.

I spent five minutes trying to find your gallery, and gave up. Please post a link. Or, better, update your drawing to show where the speakers and couch are.

Panels two inches thick are not useful for bass traps. They need to be at least four inches thick. Any fabric is fine for bass traps in corners, but absorbers at reflection points must be fully absorbent at high frequencies. So your suede is not the right choice for that location.

--Ethan

No Ethan you're right. 2" do very little as basstraps. My hope were that the 4" panels at the rear wall behind the sofa and those behind the speakers could help out as basstraps and the 2" ones too the sides of the room weren't totally unsuited in absorbing the higher frequency reflections even though they are made of owens corner 705 type insulation and microsuede fabric both things limiting it's performance in that area. The fabric is fake suede if this matters. So not leather of any kind.

A quote taken from a guy named Terry Montlick:

Guilford Anchorage does not have very good acoustical transparency. My measurements show that it attenuates more than 3 dB at 2 kHz, and about 6 dB at 8 kHz. That is at least a doubling of panel space required at these higher frequencies, compared to FR701.

"SoundSuede" fabric is similar to Anchorage in performance. Dazian Janus measures a little better, with around 2 dB attenuation at 2 kHz, but 4 dB at 8 kHz.

And some tests done by ATS Acoustics were from i got the fabric:



>Clip<

Made this short clip so that you might get an idea of how my main listening position is configured. Behind the Front, center and subs and again behind the couch i've placed 4" panels. To the right side of the couch i've placed 4x 2" panels (three under the windows and one too the right side close to the couch). Again too the left ( not much wall here this is were i stand in the clip) two 2" panel on the bottom and top of the wall right too left of the couch. Two extra 2" panels is placed even further too the left on a opposing wall.

Edited the illustration as told:



Can't i use my MultEQ Pro "before" measurements as an indicator of how badly the high frequencies is messing up the acoustics in my room? Or maybe i need too use something better like the ETF software?:

The below results are from my last calibration: