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In Reply to: RE: cabinet designs for 15" coaxials posted by hollowboy on February 09, 2012 at 18:55:31
thanks holllowboy! the modular idea is one that's new to me, and has a lot of appeal. any idea where to look for successful designs for such?
i have never built or designed a speaker cabinet and am looking to stand on the shoulders of giants as much as possible.
-andre d
Follow Ups:
By 'modular' I just mean to have the bass and mains seperate. Lots of bookshelf + sub systems are made this way. In high efficiency, there's all the horn+bass box systems based on the Oris and Azura, OB+bass box systems based on the PR170MO, and many more. You can look these up in this forum.
It is difficult to get a coaxial's woofer to go flat from where it crosses over (about 1.5-2KHz?) right down to 50Hz or so. As well as the driver specifications (light cone, extreme midband sensitivity etc), your stated unavailability of corners, the (I'm guessing) requirement to position the driver near ear height, and upstairs room (timber floor?) all add to this.
Duke's take on going modular is two tops, 1 bottom:
go with 2.5 cubic feet tuned to 80 Hz, and add a subwoofer for 80 Hz on down*
My take on going modular is two tops, 2 bottoms:
~1 cubic foot sealed / aperiodic, and add one subwoofer for each channel, from ~140Hz on down. Use the subs as stands for the coaxials.**
*for a bulky driver like this, the smallest internal width and depth you can have is about 40*30cm (16*12"), which, assuming the driver, port and bracing take up half a cubic foot, sets the height at about 70cm (28").
This is not really tall enough for a floorstander. I'd recommend purposely building such a cabinet oversized - make it taller to bring the driver to ear height - then fill some of it back in. This avoids the need for stands and gives you flexibility to remove the fill later to try other drivers / positions / tunings.
**I made what became my bedroom system with 15" coaxials, and reinforced the bass with additional 15" drivers in the same box. Even then, they are still a bit bass shy, hence my enthusiasm for subwoofer augmentation.
thanks. any info on how to "tune" a cab for certain frequencies would be appreciated. -andre
-andre d
Probably best to grab some free software and play.
I like hornresp. It was written to model horns, but can also do sealed and ported boxes. There might be something simpler out there: google away and see.
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