After lots of research I have used 100mm fibreglass slabs behind my pictures in my listening room, following reading this. High WAF and it works!
(PDF) On the use of paintings and tapestries as sound absorbing materials
(PDF) On the use of paintings and tapestries as sound absorbing materials
To add onto this, the website Spoonflower lets you print onto various materials. Their Performance Knit works extremely well to cover absorbers.
I always figured they were on to something with these;
Elvis Presley King of Rock Record Cover Blue Hawaii Tapestry Wall Hanging 725734589446 | eBay
Elvis Presley King of Rock Record Cover Blue Hawaii Tapestry Wall Hanging 725734589446 | eBay
I guess the key bit for me from the paper is that I always thought you needed acoustic panels with acoustic transparent cloth to make a decent contribution to room treatment. But this paper shows a normal oil painting which is gas impermeable can have considerable effect if a fibreglass slab is put behind it! For me it means room treatment is so much easier as I can just modify the stuff already hanging on my walls.
It's not too surprising that closed pore canvas doesn't absorb much HF, but it's nice to see that it still works well for mids and lows.
Do the reverb time math. Sound may bounce around a room a dozen times before getting to your ear. So adding absorbent (or furnishings) almost anywhere in a room in any amount can be helpful. But better planned is better, of course.
So those simplified diagrams of comb filtering based on rays off the side walls totally destroying the sound quality are, well, simplified.
B.
So those simplified diagrams of comb filtering based on rays off the side walls totally destroying the sound quality are, well, simplified.
B.
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