Bass management -- the trick of putting absorbers at a front null

Thanks, Erik. I'll take a look, but the problem is that my room's irregular shape and non-hermetic situation makes it impossible to put into these room simulators. I use REW a lot but it's as much a systematic try-and-see and try-and-listen approach.

Again the idea for placement as in the video diagram at a null position uses the idea of equalization of relative high to low pressure areas with a velocity.

That is an application utilizing a different phenomenon, no?

Yes-but a same phenomenon as any frictional absorber with the variables being frequency and absorption band.
My emphasis would be to acknowledge the 3D environment being helpful with placement.
The example (diagram presented in video) uses 50 Hz as the frequency range and appears to position the panel perpendicular to the wall and parallel to the end wall (assuming a rectangular plan) illustrating the idea that can work to ’level’ an imbalance at a narrow frequency range.
A narrow band (mid-high frequency absorption) frictional panel could be placed parallel to a side wall, perpendicular, and any angle from 0 deg to 180 deg.

How can it be from 0 to 180 degrees if it needs to intersect with null in the room from one wall to the other.. If it is only so wide (the null) and using the width of single panels, what goes by the panels (untreated) will literally come back and bite you in the As$. I see how it works, and in a LONG room it may be practical, IF you can get the break closer to a front or back wall.. BUT in my listening room?

Pretty darn UGLY having a break dead center of the room. To treat a (50hz) problem wave. What about 80 and 120. LOL It would start looking like huge chess board Wouldn’t you agree..

The spring traps address 3 different areas and just needs to be adjusted for volume and the frequencies you want.. I like that kind of thinking...

Honey I fixed the bass problem..

Click Click, I’m peaceful she’s not.. :-) The spring traps I could get away with in the front room but 1.5 meter hurdles, that’s a bit of a stretch. Get Ready, Set, GO!!!!

@oldhvymec If you watch a bit more of the video, you'll see he's not suggesting such a simplistic solution. He's pointing to a fact about acoustics which, combine with a variety of other techniques -- in some rooms, not all -- can help mitigate problems, and not just at 50hz. So, your off the cuff response while amusing kind of turns him into a simpleton. Not really fair, but hey, this is a just a forum so I guess mere joking is kosher!

I didn't mean to make him look simple. I wanted to point out it was difficult to understand and could have been a LOT easier. 

 He wasn't simple enough. AND it was an easy thing to understand. EVEN the host continued to go back and say "SO IF" several times.. There was a lot of talking, that could have been narrowed to 10th, at the MOST.. LIKE, where to place the weirs? He kept referring to theory. When in fact he was being asked HOW to place the traps, from one side of the room to the other, against the walls, in the center of the room, in front of you? The guy continued to talk but NOT directly answer the questions posed..

NO ONE is going to place a BARRIER in the middle of a home listening room. Not me anyway.. DBA and acoustic treatment are actually polar opposites. Kind of like putting up a WALL of sound, IT'S EVERYWHERE.. Including the neighbors pool... I have a FEW different VBDA systems here. Varied BASS Distributed Array. 

I also wondered WHY the best product he offered, he also quit making.

THAT made ZERO sense to me. Excuse please OP, LOL I may type a lot, BUT I get to the point. Most of my conversations with folks are as long as my replies when typing.. Not a lot of "see how smart I am in the mix". I try to show that through, short, thorough questions and short, thorough answers..  YES and NO is just the right answer sometimes..


NOT KEEP TALKING.. Reminds me of my old boss.. SHUT UP... QUIT TALKING... I use to have to tell him that.. QUIT TALKING, START LISTENING.

I'm so glad I fired him....after he fired me for having a broken neck..

See just two extra lines, including this one..

Regards