Later i built second, even more compact version of the 4way open baffle setup. Bass is dipole with two 15" woofers in tandem. Rest is the same, as is crossover. I have posted these before, just to show small or no baffle.
I use biamping with plate amp active plus 31band ultracurve, so making bass flat is no issue.
I use biamping with plate amp active plus 31band ultracurve, so making bass flat is no issue.
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OK, here's the same setup as modeled in Edge above (see post #4657). This time, in Basta!, using driver parameters, and with a passive crossover. @adason I adjusted the vertical scale to approx 25dB/decade, in line with IEC recommendations. (I may have made the baffle slightly wider this time, bringing the problem frequency a touch lower.)
Dipole cancellation is compensated in active crossover by selecting different crossover frequency for upper and lower path. Say your upper path is 180 Hz (i use 150Hz), but for low path you select 100, or lower, even 80 Hz. Then you simply increase the level in lower path to compensate. Decreasing dipole cancellation is opposite to eq, thus helping to flatten it out. To some extent, offcourse. Nothing is perfect.
