A couple months ago I decided I needed to build some new subs. I've built a Dayton Reference 15 HO sub years back that I sold, built a ported infinity sub for my brothers theater and a few other projects.
I'm currently running a pair of "18Hz Infinity Offset Horn Towers" designed by tsloms in THIS THREAD
. My brother and I each built one years ago and I've had them both for the past year. While their output is decent, I have not been happy with the far-from-flat response curve. The significant peak at 60hz is awful in my room and I cannot get the full advantage of the horn tune as the 1260W drivers xmax doesn't allow it. And while I know a MiniDSP-HD or similar could help tame the 60hz peak, I've been aiming for the benchmark 'Reference' output levels for no other reason than having a goal.
I got caught up in the 'Multiple Cheap JBL Subwoofer' idea and was trying to find a good alternative, but wasn't having any real luck. Enter the DIYSG Buyout Subwoofer
. Made by Eminence (story told HERE
), and sold by Erich at DIY Sound Group. He had some B-Stock (perform fine, but cosmetic blemishes) for a steal and when all working together they were very potent and efficient.
After some educational discussion with Erich, I purchased four drivers.
Erich packs the drivers very well.
All four lined up. The photo makes them appear different sizes for some reason.
Can for scale.
These drivers have some serious magnets.
After going around and around with different designs, I think I've settled on a slot-ported, dual driver design. I really didn't like the idea of building four large boxes, so I think I'll go with two extra-large boxes to minimize the cuts and speed things up a bit. I played around with both WinISD and Unibox to arrive at the following:
To start with I'll be using my trusty--if less than glamorous--Behringer A500 fanless amp. It will put out 370W RMS, which when coupled to the combined sensitivity of the subs (they will be placed close together enough to 'act as one'), will get me significant output.
I know there are a lot of assumptions and calculated results don't always become apparent in the real, but it's the best I have to run with. With that current amp power, the excursion is about 5mm and the port air speed is stupid low. I'm panning ahead and making the box capable of a significant amp upgrade in the future to give each sub the 600W RMS it can handle. At 600W/driver it uses all xmax and just pushes the port airspeed into the danger zone (see the following imgur album link for more pics).
It's been so long since I built anything, the last being the Econowaves in my sig. I should be getting 4 sheets of mdf in a couple days to start my biggest build yet. I'll keep you all updated.
Relevant imgur album HERE