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Array of PRDs for lower diffusion?
Old 23rd January 2013
  #1
Lives for gear
 
🎧 5 years
Array of PRDs for lower diffusion?

I have calculated a PRD diffuser which I think will sound good in my studio design. I want to diffuse the rear side corners of the room, which is effectively the area with reflections of first arrival. The rest of the room uses deflection to lengthen the ISD gap. I have seen information on nested QRDs used on a flat wall, but nothing for a corner. Would it be wise to use an inversion sequence of the same diffuser if they were spaced apart? Should I use different roots of the same design frequency, for a different array? Would adding absorption between the diffusers be possible, or must it be reflective to diffuse a lower frequency overall?



Code:
design freq: 600 - 6000
prime basis #: 277
primitive root: 5
columns: 12
rows: 23

Well heights (in cm, quantized with step size 1)
1 20 26 2 25 11 28 8 3 26 3 18 
5 3 16 15 12 13 24 26 12 13 17 16 
23 23 13 25 19 2 6 6 16 4 10 26 
18 28 28 7 10 8 11 0 1 21 19 21 
19 3 27 24 8 21 10 26 2 4 21 7 
7 9 15 21 8 12 22 19 14 8 21 17 
27 7 17 18 18 11 1 22 11 11 10 17 
1 23 4 1 2 7 27 6 25 28 26 22 
24 7 0 20 5 12 4 21 28 9 24 16 
24 6 8 1 12 23 5 22 21 28 16 5 
27 5 3 9 5 4 2 24 25 20 23 24 
7 20 24 17 17 26 21 9 4 12 12 3 
14 9 13 7 28 27 15 20 15 22 1 2 
8 12 14 9 6 25 20 16 14 19 23 3 
15 13 5 14 18 1 13 16 23 15 10 27 
22 20 6 26 13 6 7 8 22 2 16 22 
27 24 15 3 17 8 2 5 13 26 11 21 
18 19 4 20 14 0 11 9 25 9 14 28 
27 4 11 19 13 15 2 25 18 9 16 14 
10 18 20 25 10 7 18 10 8 4 19 22 
23 24 6 15 11 20 5 5 23 14 18 9 
15 1 3 28 17 27 14 27 25 1 11 2 
10 17 6 17 25 28 19 12 22 12 4 0 

Number of wells (based on quantized well heights)
1 cm: 10
2 cm: 10
3 cm: 9
4 cm: 10
5 cm: 10
6 cm: 9
7 cm: 10
8 cm: 10
9 cm: 10
10 cm: 9
11 cm: 10
12 cm: 10
13 cm: 9
14 cm: 10
15 cm: 10
16 cm: 9
17 cm: 10
18 cm: 10
19 cm: 9
20 cm: 10
21 cm: 10
22 cm: 10
23 cm: 9
24 cm: 10
25 cm: 10
26 cm: 9
27 cm: 10
28 cm: 10

Total length: 3944 cm
Diffuser properties
Well width = 343/6000/2*100 = 2.86 cm 

Total size = 34.32 x 65.78 cm
The illustration is just an example, as this PRD design is a bit smaller than shown.
Old 24th January 2013
  #2
Lives for gear
 
🎧 5 years
In this thread 64 Cell (8x8) PRD (Skyline Diffuser) question - Page 3

...they say the spacing between diffusers should be within a 1/2 wave of the low cutoff, but based on surface area or something. If my diffusers were oriented short sides horizontal, I am guessing I would need 5 spaced about 4 inches apart to really bolster diffusion below the cutoff.

I have no idea how diffusers perform near the boundary, and I haven't seen them used that way before. Is anyone familiar with this idea?
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