While Glenn of GIK recommends (in the GS forum) that RFZ be non-FRK,
any advice on whether the other non-corner (wall and ceiling) bass trap panels should have FRK?
(N.B. Please correct my summary if necessary.) Thanks.
References: Rigid fiberglass density tests what is and is not a bass trap .... Difference Between Owens Corning 703 & 705 | eHow.com PME Records Broadband Absorber Construction Acoustics Forum • View topic - Studiotips Corner Absorber Acoustics Forum • View topic - Types of Treatment
703 - 3 lbs/sq ft
705 - 6 lbs/sq ft
FRK stands for Foil Reinforced Kraft paper.
Walls and ceilings:
Thickness vs. coverage
1. a)it's better to more thinner panels spread more completely around the room than less thicker panels covering less total surface area
b) wall panels should be 4" or 6" thick (6" is better)
c)For walls and ceilings, mount the panel 2" off the wall with air space behind it instead of flush mounting
d)Density appears to become less important when the panels are made thicker
e) Use OC 703 instead of 705 (see ehow article)
f) Use NON-FRK for first reflection zone as it will reflect High Frequiencies (HF)
g) for ceiling or other wall areas use FRK or NON-FRK depending on what you want to accomplish; FRK for more low frequency (LF) absorption
a) triangles filling the corner (superchunks) is better than straddling flat panels.Take of the FRK on the faces between the stacks. The FRK should face the
room, not each triangle.
b) FRK Improves bass absorption. Use it on the corners
c) if your using the straddling approach,have the rear of the panels touch the walls instead of mounting the entire panel off of both walls
cover the rear of the panels with acoustically transparent fabric (you breathe through it. Make it flame ******ant with borax)