[oneinthepipe]

I hope that I am not becoming a PITA. 

I was reading the old threads about bass traps (dozens of them) trying to learn more, and I came across a thread advising against applying facing between the separate panels in a multi-panel bass trap or absorption panel.  The comments in the thread indicated that facing material should only be used in the front of the panels or in the back of the panels. 

http://www.audiocircle.com/index.php?topic=30754.0

I don't understand why a layer of foil, paper, or plastic couldn't be placed between the first and second OC 703 panels in a three panel bass trap or absorption panel.  Wouldn't this permit the absorption of high frequencies but also increase bass absorption, since a facing purportedly increases bass absorption?  I did this in the 6" panels behind my speakers, but I removed the kraft paper after reading the thread.

Also, I installed thin kraft paper in the fronts of the 6" OC 703 bass traps that I built.  I didn't use any spray adhesive to secure the paper, but it is held in place by the frames.  Is it necessary to use spray adhesive?

NB:  The 6" panels have made a remarkable improvement compared to the combination of 1", 2" and 4" panels that I previously had.  Thank you again, Bryan, and everyone else for all your help.

[Big Red Machine]

I have no "Paper" on any of my traps and absorbers.  Why do you think you need paper? 

Can't imagine the paper is going to inhibit the absorption of bass frequencies.

[oneinthepipe]

I have no "Paper" on any of my traps and absorbers.  Why do you think you need paper? 

Can't imagine the paper is going to inhibit the absorption of bass frequencies.

BRM:

The paper purportedly limits the absorption of higher frequencies and increases the absorption of low frequencies, depending on the type of facing.  The limit of absorption of high frequencies is one of the factors that distinguishes a bass trap and a broadband absorption panel.