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In Reply to: Re: Continuing To Load Our Rears posted by Bill Fitzmaurice on June 6, 2005 at 04:51:27:
I was under the impression that "full range" meant anything below the HF crossover frequency. Then, let me know if this is a bad plan: The small/medium design I had in mind was to stack two DR15s (per side of stage) with the top one handling 800Hz & down, while the bottom one doubled the bass from about 100Hz and down; the HF would be handled by a BMS coaxial driver on a DDS horn from 800Hz & up. Only one active crossover point necessary! If you recommend that the DR15 not try to pass LF below a certain point for SR applications, it would be a good thing to know ahead of time!
Follow Ups:
I use the term full-range to mean stand-alone, with no sub. The range of the DR15 is 60 to 20 kHz (if loaded with tweeters), which for many pro-sound uses is fine without subs. If you need to go lower than 60 Hz then you'd want to use one DR15 atop a Tuba 30 (loaded with a twelve) or Tuba 36 (loaded with two twelves or a fifteen)to handle down to 30 Hz or so. If 60 Hz is as low as you need to go then use two DR15s.
Bill- I'm asuming that the DR15 lower cutoff is due to horn size, as opposed to driver chioce? I had thought to relocate the vents to the panel where the tweeters would have been. Yes, I was already considering the Tuba 36 to sate my curiosity about your brand of horn-loading! BTW, do you have path length data for your horns for time-alignment purposes?
Yes. The DR15 is horn loaded to about 100Hz, below that operating as bass reflex. The vent can go on that panel. Tuba 30 for instance is horn loaded to 45 Hz, direct radiator for an octave below that. Time align is roughly a ms per foot of horn length. With subs don't lose sleep over it, in the non-directional frequencies you can't hear less than 25ms. With DR15 to align with HF elements 3ms.
BTW, if you go with the DR15/T36 combination save yourself some work and don't vent the DR15. Crossed over at 80 Hz or higher it will work better with a sealed rear chamber.
You answered my next question before I posted it. How's that for service!
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