Here's a picture of mine:http://pub48.bravenet.com/photocente...31&album=48032
Here's a description:
I don't believe in building other people's work, but in designing my own, and then building it myself.
I chose several design goals:
1. use a 3 way, not a 2 way
2. NOT break up as much of the critical human hearing frequencies between 300hz and 3000hz as possible with the effects of a crossover
3. Use electrical crossovers
4. Separate the midranges in the array completely from each other and use a 4 lb/cu ft fiberglass stuffing, in a long tube to reduce the backwave sound radiation to almost nothing through absorption, and to prevent any interaction with any other speakers in that backwave.
5. Keep the cost for all including electronics of this down below $1300.
I was successful in all design parameters except that I couldn't get all the way to 3000hz. I will probably switch to a digital electronic crossover in the summertime.
I followed Jim Griffin's white paper to the letter, as well as had several communications with Jim about it.
1. 2 12 inch goldsound 15 mm xmax woofers
2. 34 Sammi 3 inch 3.3 mm xmax mid woofs, 5 inch c-to-c, requiring no more than 2750 hz cross. High quality South Korean speaker with a copper voice coil, paper fiber composite cone, similar to current HiVi models.
3. 60 Dayton ND20FA tweeters with cut flanges to .9 inch c-to-c to limit comb filter distortion to above 15khz(and inaudible in my environment)
4. Crossover is Rane AC23 electronic at 165, and 2600, 24 db/octave L-R, with analog electronic time delay.
5. Separate 350 w/ch amp for woofers, 150 w/ch amp for mid ranges, 60 w/ch amp for Tweeters, Kenwood B-1 Basic Pre-amp. prefer vintage 80's equipment(in this case Linear Tech for the woofers, Kenwood Km-106 for the mids, and Sherwood for the tweeters)
Each midrange is enclosed in its completely separated(3/4 inch of open air) 23.5 inch x 4.0 inch PVC tube stuffed with 4 lb/cu ft weight Pillow fill sheet covering Fiberglass insulation(from research by Vance Dickason and Rod Elliot.)
Woofers are currently in a too-small boxes which only allow a flat extension to about 39hz, but will soon move to a set of 6.1 cu ft boxes allowing a lower extension to about 23hz.