Planar Speaker Asylum

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Planar Speaker Asylum

RE: Diffusison

71.67.188.239

In Reply to: RE: Diffusison posted by pictureguy on September 08, 2016 at 10:21:30

High - to match the length of the drivers. I would not expand to 4 ft wide before knowing that 2 ft wide is insufficient. It likely is enough.

Follow Ups:

RE: Diffusison - pictureguy 12:26:55 09/08/16 (8)
I think I can manage 4'H x 2'W Diffusors are a max of 7 1/2" thick and than only in a few places.

Each panel has an amp on a stand behind it. So I'm 'space constrained'.

Link is to an image / price. Price is ridiculous. I can build the same thing for a fraction this ask and from a BETTER material.
Too much is never enough
- https://www.bhphotovideo.com/bnh/controller/home?O=&sku=4376 (Open in New Window)
- Wood works... - grantv 12:50:29 09/08/16 (7)
  I built mine from 2 x 2's, IIRC also right around 7 1/2" deep.
  - RE: Wood works... - pictureguy 13:40:34 09/08/16 (6)
    Of course wood works. But WHERE do you get 2" x 2" wood?
    All the 2x2 I see is REALLY 1 1/2" and NOT suitable for this use. If I had a MAJOR wood shop with a Planer and a GOOD table saw, I could work with non-dimensional lumber.
    After all, a quick count shows 144 cells arranged in a 12x12 matrix.
    
    Besides, wood weighs a LOT. Yellow Poplar, for example, runs nearly 28lb per Cubic Foot. I've calculated a need for about 1.25 cubic feet which would go 35lb. Ridiculous waste of wood, IMO, and difficult to hang. And you can't actually GET 2" x 2" wood!
    
    I can make what you have, painted ANY COLOR you wish and bring it in for about 5 POUNDS, with backer, paint and hanging hardware.
    
    I won't disclose, at this time, my choice of material, until I've MADE some. It isn't impossible, but it is somewhat a PIA to get what I want, since NOBODY carries it, especially the 'home stores' .
    HINT: Not a hard foam OR castable foam.
    
    Too much is never enough
    - RE: Bamboo works, too :-)) ... - andyr 19:30:20 09/08/16 (3)
      I have the same problem - lovely wide soundstage but it lacks depth (compared to my last listening room. I suspect because, like yours, my panels are too close to the wall.
      
      Sure there are many things you can use to diffuse the rear wave (and diffusion is what is required, IMO - not absorption). So what I am thinking of doing is creating a lattice out of 1"D bamboo poles and fixing this to the wall (which in my case is sloping :-(( ). It will run up to about 7' high and span to the outside of the panels - so about 10' wide.
      
      The gaps between the lattice will be 1.5 - 2" square. If it delivers the soundstage depth I want ... then I can get the required WAF approval by painting the poles to match the walls.
      
      Andy
      - RE: Bamboo works, too :-)) ... - pictureguy 20:21:48 09/08/16 (2)
        
        In Reply to: RE: Bamboo works, too :-)) ... posted by andyr on September 08, 2016 at 19:30:20
        
        I have a COLLECTION of about a DOZEN Pool Noodles in 4" diameter. I tried making an 'array' in a PHi Shape 'arc' which is like a 'section' of snail shell. maybe 30 or 40 degrees or arc. I used PVC and ingenuity. PVC did NOT go up thru the center of the Noodles.
        I'll revisit that LATER.
        
        Another test would be using the famous 'Fake Fikus'. This would be expensive at the density needed AND take up lots of floor space. Nope, I'll try other stuff
        
        A FLAT array of bamboo is NOT correct. That automatically limits frequency and 'regularizes' the dispersion pattern, and to only the horizontal plane AT THAT.
        In short, presenting the panel with variable spacing and distance of elements of an otherwise regular array will provide a spread of frequency response. the pattern will remain horizontal.
        Building to a 'rule' should facilitate that goal.
        
        Too much is never enough
        
        RE: Bamboo works, too :-)) ... - Satie 16:58:50 09/09/16 (1)
        
        In Reply to: RE: Bamboo works, too :-)) ... posted by pictureguy on September 08, 2016 at 20:21:48
        
        I thought AndyR was going to do overlaid vertical and horizontal lattice. You are bringing up a good point though about wanting not to make the intervals too regular - perhaps use QRD tuning for each axis for width rather than depth.
        
        RE: Yes, I was, Satie. But ... - andyr 18:57:45 09/11/16 (0)
        
        In Reply to: RE: Bamboo works, too :-)) ... posted by Satie on September 09, 2016 at 16:58:50
        
        I think it is a good suggestion of pictureguy's to make the spacings irregular.
        
        Andy
    - Nominal 2 x 2's, yes - grantv 14:13:00 09/08/16 (1)
      I used 2 x 2's, yes = 1 1/2" x 1 1/2"
      Worked fine for my room, perhaps not ideal for you. The weight is minimal, not a waste of wood IMO (but then I live in BC Canada, wood is our "thing"), easy to hang.
      It was a fun project to boot...
      Have fun with your project.
      - RE: Nominal 2 x 2's, yes - pictureguy 16:40:45 09/08/16 (0)
        
        In Reply to: RE: Nominal 2 x 2's, yes posted by grantv on September 08, 2016 at 14:13:00
        
        I'd think about 2x2 IF I could find a way to calculate a 16x16 matrix.
        That's 24" worth of '2x2'.
        
        Too much is never enough

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