Originally Posted by stockmonkey2000
I've also been thinking of building some 3pi horn speakers using the B&C De250 compression driver and the Acoustic Elegance 12" driver.
The B&C-DE250, and AE LF driver is a known, state of the art combo. You could always build them w/an outboard passive Xover, and eventually get into an active, dsp contoured, bi-amplified system. Power is cheap, dsp processing/ active Xovers are cheap. With the passive unit, you could have a known target, then voice to it.
Another option is the passive eD Cinema debut,...very reasonably priced. Another will be Mark Seaton's diy offering when it's released. It's a high end, diy cabinet, for an AE 12", and a comp HF.
I'm not sure I will need the additional output as the PBN's were as loud as I ever needed them to be and that was in a bigger room (18x33) than I have now. It seems everyone is doing horns these days so I thought I would see what the buzz is all about.
The measure of directivity control that the horn/waveguide units offer is what could be of benefit. Not only does the waveguide offer directivity, but the larger 12" driver handling some MF energy, offers controled beamwidth at freqs approaching it's diameter.
I will say that most of the horns I have heard I have not been too crazy about, but do have limited experience with them other than through concert venues and such
Yes, HOM, or higher order modes, as discovered and layed out by Earl Geddes. The intra-horn reflections, prior to even exiting the horn, do exhibit some psycho-acoustic nastiness with some designs
. Geddes addresses this with patented technique of open cell foam within the waveguide, thus attenuating side to side energy less than the energy directly exiting.
All this is academic, as you've got some superb
loudspeakers. We all preach higher output designs etc., but those PBN's are some of the finest speakers around
Most would be quite envious.