I am working on designing a large 2 channel audio multi-horn based system. I also have intentions to build other speakers after that will likely employ my big SEOS18s. The thing is, when it comes to audio, its one of the things I do spend money on, its my hobby, so over the years I have amassed a small collection of drivers, horns and woofers. I thought I would start a thread of my journey in putting together at least the first system, but in the process I plan to measure a LOT of horns/drivers, more than what I have planned for the aforementioned system. I figure this is as good of a place to keep a virtual notebook as any.
* warning, I move at a glacial pace as I tend to have an active social life (38 and single) outside of a demanding job. So this thread will get updated in bits and spurts as I have time.Bit of background:
I've been into the hi-fi scene since I was 24 or thereabouts and into DIY since I was 26. (I go by JoshK on most other audio sites, but it was taken here) I have built tube amps, preamps, cables and a few speakers that I didn't design. My education was in statistics, math and smidge of physics, so I took a liking to the theory of audio. I have Dr. Geddes to thank for pulling me into higher efficiency designs and focusing my attention on the things that matter. I have been to his house and heard his setup (amazing) and I have also met Dave Slagle and some of the former New York Triode Mafia crew. [I'm not a die-hard when it comes to tubes vs SS, vinyl vs CD, etc, but I do think good tube amps sound very satisfying, but not all of them...and I have a lot of fun learning and designing them.] This horn system is intended to be run off my Thomas Mayer built 211 monoblocks, at least from the lower horn up.
I have read a lot about speaker design, measurements, acoustical theory and crossover design throughout the years but have yet to do any measurements/designs myself. So here goes a grand maiden voyage on a not-so-simple design. I will learn through this and employ the help of the knowledgeable folks here.
End of background:The measurement equipment that I have at my disposal:
1) Omnimic V1 (updated the software)
3) Earthworks M30
4) Focusrite Scarlett 6i6 (was on ARTA's tested list)
3) HOLM acoustics
2) Dayton Audio DTA-120 Class T Digital Mini Amplifier 60 WPC
6) MiniDSP 4x10 (intended to prototype the crossover)
7) ATI 1504 (for use with above, but already had it)
I am still figuring out the connection setup for using laptop + Focusrite + ARTA + M30 + DTA-120 + test speaker. Think I have it figured out, but may need to confirm (the loopback part).Stuff to measure:
1) AE TD15X in 5cuft box with dual 1400gm PR
2) 6x JBL 2226H in no box as of yet
3) AE TD15M
4) AE TD12M
5) 140hz LeCleach mahogany horns with 4" throat, 38" mouth (>100lb ea iirc). Three candidate drivers:
- Faital M5N12-80 http://www.usspeaker.com/faital%20pro%20m5n12-80-1.htm (JLH was using on 135hz Tractrix horns to good effect)
- FANE Studio 8M (I'll need to make a backchamber for this one, so it'll be a while before I can measure.
- JBL CMCD-82H (likely my choice). Got the drivers but the phase plugs are backordered, so I'm waiting.
6) Iwata 300hz, my only 2" horn, two candidate drivers:
- Community M200A (this is what Avantgarde used, at least originally. These have the harder to find A diaphragm that avoiding a nasty breakup) They are huge and intended to be used from 400-4k.
- Radian PB950Be-8
7) Custom made (my design) 21" diameter OS with LeCleach style mouth rollback, made of mahogany at the same time as the big ones. All came from Jeffrey Jackson of Elevenhorns. 1.4" throat
8) 600hz high flare LeCleach horns in mahogany (11horns too), 1.4" throat.
- Eighteen Sound 1460A -8
- Radian 745NDBe-16
- Radian 475Be (yes I know, that is a lot of Be)
- Only 1 B&C DE250 that I can locate, but can use to compare
10) Beyma TPL-150H
11) Fostex T945 (these are alnico, meant to be a big upgrade to the JBL 2405 they competed against)
12) B&C DE35 (some say this is just as good as the super high dollar super tweeters, but it costs a lot less)
I think that about covers the list, at least for now. I think I have some other drivers that aren't as relevant. For the record, this will likely be at least three systems and I don't plan to keep them all, but the experience of building and comparing the various trade offs I find intellectually stimulating.