audiofooled
Addicted to Fun and Learning
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On multiple occasion I have tried to explain how it works in my room. It's about not supporting the modes, you have to consider floor bounce, you need to have multiple bass radiators distributed in the vertical plane for left and right channel and strategically placed sub(s). You also need to have corresponding delays across the frequency band with regards to the listening position. Phase also largely matters. Mains either cardioid or sealed, sub also sealed (in order to have net displacement and pressurization).
Not having cardioid mains/subs I had to choose half of wavelength of 110Hz for mains spacing (three bass radiators distributed vertically per channel), with sub in the middle, so quarter of the frequency. The entire system also quarter of the frequency from the front wall. No high pass to the mains, with 200Hz lowpass to the sub.
This is vector average of the floor bounce, showing +/-3dB and magnitude falling like a brick above 200 and bellow 55Hz. Also no more than 23 degrees of excess phase 110Hz and bellow:
Wavelet of the measurement, note the early decay, peak energy curve, also what happens at 110Hz and bellow:
There's no sub bass at the floor underneath my seating position. So where is it? At ear level, delayed to where the main listening position is (10-12ms, for 10-12feet distance), close to the rear wall, where particles have nowhere to move:
Raw magnitude response at ear level, MLP, prior to any EQ, showing as little as 0.5 dB difference in sub bass for the left and right channel (purple/pink). Vector average of the two in red and summation of both channels in cyan:
Phase/mag summation across the full spectrum:
If there's decorrelation in low frequencies, I want to hear it, and I do.
Not having cardioid mains/subs I had to choose half of wavelength of 110Hz for mains spacing (three bass radiators distributed vertically per channel), with sub in the middle, so quarter of the frequency. The entire system also quarter of the frequency from the front wall. No high pass to the mains, with 200Hz lowpass to the sub.
This is vector average of the floor bounce, showing +/-3dB and magnitude falling like a brick above 200 and bellow 55Hz. Also no more than 23 degrees of excess phase 110Hz and bellow:
Wavelet of the measurement, note the early decay, peak energy curve, also what happens at 110Hz and bellow:
There's no sub bass at the floor underneath my seating position. So where is it? At ear level, delayed to where the main listening position is (10-12ms, for 10-12feet distance), close to the rear wall, where particles have nowhere to move:
Raw magnitude response at ear level, MLP, prior to any EQ, showing as little as 0.5 dB difference in sub bass for the left and right channel (purple/pink). Vector average of the two in red and summation of both channels in cyan:
Phase/mag summation across the full spectrum:
If there's decorrelation in low frequencies, I want to hear it, and I do.