Dual 15" Avalanche Push-Pull

JohnL

Member
2004-04-07 1:47 am
Tampa, FL
Hey folks, my speaker building has been really stagnant for the past few years. I've gotten older, I've gotten married and my requirements have changed a bit. I've had a few subs in my house, but I really think the best I've heard was an M&K THX350. I was planning on doing a couple LLT sonotubes with AVA15s then happened on a deal and the AVAs have been sitting in their boxes in the closet since. I'm at the point where I'd like to get rid of the huge box and monster sub in the living room for something smaller and maybe more accurate. My thought was to try to replicate that THX350 with better components and more power. I'm thinking a 20x20x37 box configured like the picture, built from 1" MDF, the bracing probably won't be as fancy as that, but at least 1 brace going each way. The internal volume should be around 5 feet ^3. I've been using an EP2500 on my current sub, but I might sell that one and go with an iNuke.

I'm just looking for some input, another set of eyes since it's been a while since I've built anything and I don't want to overlook anything obvious. Thanks


[IMGDEAD]http://mkloudspeakers.com/media/V2.%20New.%20X12%20Cabinet%20cross%20section%20-%20full%20bracket%20+%20drivers%20cutted.jpg[/IMGDEAD]
 
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Hey folks, my speaker building has been really stagnant for the past few years. I've gotten older, I've gotten married and my requirements have changed a bit. I've had a few subs in my house, but I really think the best I've heard was an M&K THX350. I was planning on doing a couple LLT sonotubes with AVA15s then happened on a deal and the AVAs have been sitting in their boxes in the closet since. I'm at the point where I'd like to get rid of the huge box and monster sub in the living room for something smaller and maybe more accurate. My thought was to try to replicate that THX350 with better components and more power. I'm thinking a 20x20x37 box configured like the picture, built from 1" MDF, the bracing probably won't be as fancy as that, but at least 1 brace going each way. The internal volume should be around 5 feet ^3. I've been using an EP2500 on my current sub, but I might sell that one and go with an iNuke.

I'm just looking for some input, another set of eyes since it's been a while since I've built anything and I don't want to overlook anything obvious. Thanks

That really looks like a partial push pull i.e. partial even order harmonic cancellation and partial mechanical vibration cancellation . If push pull is what you're after, I'd recommend looking into push pull slot loaded
http://www.diyaudio.com/forums/subw...e-interested-ppsl-enclosures.html#post2560994
 
With 2 woofers i would do something push-push (little gain with push-pull if you have good woofers) to dramatically reduce the load on the box. Sealed, 40-some litres.

We built 2 push-push SDX10 woofers. We purposely built them from ½" BB plywood (especially for a woofer, i'd never use MDF) to get an idea by how much the box load is reduced. The boxes weigh next to nothing (one hand lift). Add the woofers & it is a serious lift.

On initial test, (2nd order XO 100 Hz), i turned it up to LOUD. No box issues. I then turned off the satelites and turned it up another 10-12 dB. That got the top of the box moving, so it was possible to have the box sing, but at some 10 dB louder than i'd ever play the system while in use.

dave