Tri-amping 'LaScala's

[DrWho]

Not enough room to get a meaningful amount of absorption along the lines of the walls without closing down the size of the mouths quite a bit.

Well I guess when you approach the problem from the perspective of building a horn this is something that can be compensated for [] All that really matters is the acoustical impedance the driver sees and then how the flare rate controls the dispersion...it should be a relatively "easy" process to figure out how an absorbtive material affects the acoustical impedance and then make the physical horn too big, but with the absorbtion added the driver sees the same impedance and flare. Heck, it's the same concept they use when designing foam phase plugs. It should be noted that the reflections increase with an increase in frequency (because the longer wavelengths bend with the horn instead of bouncing off)...and to get very effective absorption you only need 1/4 wavelength thickness, which at 3kHz is only an inch. (so you get half the effectiveness at 1.5kHz and one quarter at 750Hz...but it's a decreasing problem with decreasing frequency...so the trick would be to match the decreasing effectiveness to the decreasing need).