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In Reply to: Looking for good 2" compression driver?? posted by j.l.guillebeau@att.net on November 03, 2003 at 16:21:04:
Four hundred Hz to 22 kHz is quite a spread; offhand I don't know of any 2" horn/driver combination that can realistically cover that range in a high-power system. Among the few 2" throat drivers that can go up to 20K ballpark are the BMS 4590, TAD 4001, and Radian 950 PB (there may well be others that I haven't tried yet). You asked about a new 2" Eminence driver; I haven't heard it, but I'd be quite surprised if it has adequate energy in the top octave for a two-way such as you have envisioned. I wouldn't recommend any of the current 2" JBL drivers, as they are lacking in top-octave energy (maybe some of their older drivers do better in the top octave). Also, power handling on any of these drivers is compromised with a 400 Hz crossover; any chance you could push it up to 600?In my experience, in a large horn the top end tends to be rather rolled off. You can put the same driver in a smaller horn with the same pattern characteristics, and it will have a more extended top end. So if you want a big horn (for a low crossover) then you either need a lot of equalization, or you need a driver with a lot of energy in the top octave. I've been playing around with some large 26" by 18" mouth constant-directivity horns (with an extremely uniform 90 degree by 40 degree pattern), and of the drivers mentioned above the Radian is probably the best match with that big horn. I've been crossing over around 600 Hz.
I personally like the idea of using a single driver from say 600 Hz on up; I have yet to hear a system with a horn super-tweeter that didn't have some integration anomalies.
Best of luck with your system!
Follow Ups:
That was my thought. The TAD 4001 will get up to 20Khz, but not flat. It peaks in the mids and is 6 or 10db down at 20K without compensation.
The big horn I was referring to is the DDS 90 by 40 theater horn, link below. Unfortunately, it's designed to be mounted using a pro-style "omni-mount" system instead of bolting onto a baffle, so it's not easy to incorporate into an all-in-one-box loudspeaker. But the uniformity of coverage within its radiation pattern is the best I've heard from a big horn. Note that the dimensions given on the page linked to are incorrect; the horn measures 26" wide by 18" tall by 17" deep.
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pro-sound company - think out of business or changed in scale - got 1" fornat horns kinda like your DDS - but mouth is only about 12"x24" - depth ~21" and no 'neck' on throat so seems ~CD 90x40 and graph tracks tightly from on -30 off horizontalhows the DDS sound so far? (is their round waveguide useful for home speakers??)
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