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

I sure like the spring traps. I would pay the 900.00 for that trap. Heck I’d pay for 4 of them. That is a bass trap. It will handle 3 different frequencies. that is my room. 40-50, 75-85 and 110-120.

A problem might arise with what ever the surround material was made of too. Need 20-30 years of life too. Treated BR or silicone

A single axis accelerometer, shouldn’t be any more expensive than a tonearm and phono stage, PLUS there is a phono stage between you and the readings.. That part didn’t make sense to me.. The tuning part with a tone arm. I’m not sure it’s accurate, but a test after will surely tell..

Doesn’t a phono stage EQ stuff? :-)

I also have suckout at 250 -6db and 350 -8db.

I like classical guitar. Start messing around in those ranges it really messes with what I like.

Who would make "Spring Traps" NOW? Me I guess. My hands are already hurtin’. :-(

50 years ago. Carpeting, acoustic ceiling, book shelfs and curtains.. Tamed a room pretty good.
Actually there wasn’t a lot of bass back then either come to think of it.. Wasn’t much of a need to tame it :-)

Some rooms just start out right...

The idea is that a frictional absorber necessarily is placed away from a wall ... not always very practical.
Angled corner traps work a bit differently (angle of incidence ... ?) with angled (design dependent) half filled corner type trap.
Something to remember is that the illustration (flat 2D) references only left / right / up / down and no depth ...
@hilde45, if all those traps are piling up and not being used I can take one or two.

Thanks, Rego. I will message you if I am buried under traps! When you say, "The idea is that a frictional absorber necessarily is placed away from a wall ... not always very practical."

I know that frictional absorbers are placed away from walls -- to gain the extra absorption from a distance to the wall roughly equal to the width of the traps, if I remember right. 

But Grimani is suggesting something different than this. He is suggesting placing them very very far from the wall in order to capitalize on a null endemic to the room's modes. That is an application utilizing a different phenomenon, no?

By the way, in terms of having multiple subs, I'm thinking less of this as a solution as I've played around with the Room EQ Wizard's room simulator.

Try it out, but it basically lets you set up a rectangular room with speakers and a sub so you can try out different placements.  Based on those simulations, I'm not sure if multiple subs really does all that. I'm not claiming expertise, I'm just saying that the evening out effect is not as good as I thought.

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.