Systemic Development > Psycho-Acoustics

Active Acoustic Correction

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richidoo:
What do you guys think about this new technology?  Looks kinda interesting to me.

http://www.bagend.com/bagend/ETrap.htm
http://www.bagend.com/bagend/downloads/ETrap.pdf
http://blog.stereophile.com/cedia2007/090707bagend/

miklorsmith:
What a crazy looking device.  It has a microphone, a 10" driver, and what looks like a plate amp including XO frequency.  First off, the fact that it claims to trap down to 20 hz is an eye-raiser.  If it can actually perform significantly that low it would replace Volkswagon-sized conventional traps to go that low.  I question why it says it only goes up to 65 hz.  It should go to 125 hz at least.

If it can do what it says it can (two separate tuning bands simultaneously!) it looks like a killer product.  Being able to really control bass is difficult and large in-room structures are usually the only way to do it.  Also, room acoustics are notoriously unpredictable so building a big trap doesn't mean results will match intent.  It would suck to build something huge only to find out you missed the target.

It kind of looks like an inverted parametric EQ like the one I use on my speakers.  Most speakers don't allow separate bass equalization so this product could well be a near-miracle.

Or, it could be a bunch of marketing hype.   :D

bpape:
From what I've heard, it works pretty decently - as long as you can put it where it really needs to be.  Also, the up to 65 thing is on purpose.  Above 50Hz, you can use passive treatments much much cheaper.  It's when you get below 40Hz that passive treatments become relatively impractical.

Bryan

richidoo:
Would it be possible to DIY something like this? You need an EQ filter and run that out of phase with the mic signal, right? The article hype makes it seem like there is magic DSP algorithms in there. Whatya think?

Would it be better to have one large unit (15" 1000W) strategically placed, or more smaller units placed in more locations? Seems that it would be rare coincidence to find a single spot where 2 different freqs peak in pressure.
Thanks

miklorsmith:
What does the thing cost?  It might have some pixie dust inside but it looks like the controls are simply XO frequency and bandwidth (Q).  My mechanical engineer buddy was trying to tell me the physics-explanation of Q which has implications way outside audio but we were having martinis and I missed it entirely.  I do understand it in a parametric EQ sense (thanks TacT and dbx) and that looks to be it from the "control room".

Conventional bass traps may be cheaper above 65 hz but they're still big and if you need two bands of trapping (say 35 hz and 80 hz) having all that function in one box would be nice.  However, Rich's concern about two peaks in one spot is a good one too.

In my room, my peaks are higher, in the 70 hz range.  Having a parametric EQ below 120 hz is a freakin' great thing to have.

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