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

So I got to watch about half of that video.
While the idea of putting traps at high velocity/low pressure points makes sense to me, I think he underestimates the benefits of corner placed traps if well constructed and exaggerates the required size.

It is true that your average 4" thick fiberglass panel is completely ineffective < 100 Hz in the corners, but that doesn't mean you need 5' of fiberglass. :)  As I mentioned before, I've had very good luck with GIK Soffit traps in the corners for this.  See my blog post for an example of what I'm calling good results.

Fortunately, his theory is easy to test for yourself with the right tools.  As his graphs point out, if you correctly attack the problem the bass will immediately and obviously even out.  If it doesn't work, you can always use the panels elsewhere. :)

Best,
Erik

Thanks, Erik. Since I last posted about traps, etc. I was able to find someone locally who was literally giving away their traps to any local audiophile who was interested. I scored 14 traps in all, including stuff from GIK. I'm just not quite making a dent yet in some peaks and nulls, so I'm interested in additional tricks. 

Hi hilde45
So, it is absolutely true that your traditional 2-3’ panels have a very hard time with this. If you look in the GIK site you can find specs which show how effective the panels are at different frequencies. Their absolute best bass traps are the Soffits.


Also, it IS true that without EQ you need massive traps, so the recipe is not just to rely on bass traps, but to rely on a combination of traps, placement of sub and listener AND EQ. Without the traps, the EQ wont work down low.

Thanks, Erik -- good to have that reality check -- "a combination of traps, placement of sub and listener AND EQ."

I've figured out placement of listener and speakers, and am trying to dial the room in now with traps and, to a degree, a single sub. I have a second sub in the house, but it was too complicated initially (because I was figuring out the other things). I hope to have a couple more good traps to work with, soon, and will try to work those in as best I can and then see how the addition of subs can help. Then, I'll move to EQ. I hope that process sounds logical.

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...