membrane traps in reflection points??? glenn or ethan :0)

[Glenn Kuras]

You really do not want any thing reflective on the fronts of the panels when in the early reflection points.
Have you done any room testing??

[ejsongs]

not recently.

just been ref mixes i know fairly well and have heard in other studios. i really don't like the sound of knauf insulation and can see why people use 703. in that i ran out of the 703 and got the knauf at a great price i had hoped that i could mix and match. my initial thoughts when i first heard the knauf stuff was that it pulled too much out of the highs vs 703 but read that it pulled out a bit more at 125hz which is a trouble spot im my room. i thought i could use both 703 and the knauf in the same panel to reduce knauf's reduction on the highs...but i was wrong....doesn't work.

i guess i just need to get more 703 and ditch the other stuff...they really do sound different to me.

ej

[Glenn Kuras]

If the knauf is 3 pound (or close to it) then it will react the same as 703. It sounds like to me it is not the panels but maybe how you have them arranged or like you said to many of the thin ones.

[ejsongs]

interesting...but i have to slightly and delicately disagree with you here. there is a sonic difference to me with different manufacturers of fiberglass panels...even with same density.

i look at it this way...

panels act as a subtractive eq of sorts. some panels subtract more or less at certain frequencies. it therefore stands to reason that different panels and materials sound different in a particular room...even if they are the same overall density.

physical proof for me is that i have some 4 in panels in one of the reflection points. at first i used 2 of the knauf panels and then tried combo of knauf and 703 and alternated with panel was on top. all 3 yielded different results.

i think that overall i my prefer the sound of 703 and what it does in my room...but to be fair my room is a hodgepodge of all sorts of material including your tri traps, 244's, 703, 705frk etc.

i am getting close to getting it right but still needs some work. my room is kinda jacked and has take a lot of work to get it to this point.

thank for you continued contribution to this forum...i am either going to make more panels or buy some more from you (maybe ethan too) to fix the issues that i am having very soon.

ej

[Jens Eklund]

Density is not the important factor. Flow resisitivity is the most important. These two are usually related more or less but not always. This together with thickness and mounting (air gap) determines the performance of porous absorbers.

[Glenn Kuras]

Originally Posted by Jens Eklund

Density is not the important factor. Flow resisitivity is the most important. These two are usually related more or less but not always. This together with thickness and mounting (air gap) determines the performance of porous absorbers.

Agreed. thumbsup

interesting...but i have to slightly and delicately disagree with you here. there is a sonic difference to me with different manufacturers of fiberglass panels...even with same density.

I myself have used both knauf and 703 and really did not hear any difference when it comes to high end. This is kind of one those things that we could go back and forth on, but the bottom line is what you like to use is what you should use.