OK. I'm building a high-efficiency center channel, to work in a VERY high output home theater system. Projection screen, large grilled "speaker bay" in the front of the room. Current left and right speakers are JBL "Perkins" horns loaded with K140s for woofers, 2370 flares with 2445 drivers for mids, and some supertweeter I don't remember (non-JBL, but similar in response to the 2405). Basically, a JBL-drivered "equivalent" to an Altec A7 VOTT horn-loaded system, with supertweeters. For sub bass, there's a pair of OAP W-horn sub cabinets loaded with 2241 18" drivers.
The main perogative here is to try and match the dynamic and tonal characteristics of the left and right speakers, but in a smaller cabinet (there's no room in the center for another Perkins-size bass horn). So, the idea came to mind, fueled by some available components I have here:
- Bass: Modified JBL 2022 12" woofer (3" voice coil, newer design) with a 15 or so gram mass ring and a softer spider than stock (gives an fs = ~55 Hz, Qts = ~.39, Vas = ~ 2 ft^3, sensitivity = ~ 97.9 dB/2.83V measured into the 4.6 ohm DCR), in a modified early-model L100 cabinet (ported at 50 Hz, f3 of about 54-55 Hz). This woofer should perform very similarly to a 2204... almost the same sensitivity, same F3 in the same box, only the midrange may be a bit more "extended", due to the 3" coil (vs. 4" on the 2204)
- Midrange: JBL 2410 horn driver on a Sammi Sound horn flare- looks for all the world, like a slightly shrunken JBL 2360 flare- has the rectangular throat, the same shape and flare curve, just only 14" wide and about 6" high, to the outsides of the flanges, with about an 8" deep flare length to the throat. Probably an 800 Hz flare, in all probability.
- Tweeter: JBL 2404H "baby cheeks".
The question is crossover topology and frequency points. My first guess was to maybe use existing JBL networks for stuff as similar as I could find... and I came up with the N200B network, combined with a N7000 as a start.