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Сообщение: [QUOTE="Марков Николай, post: 35665, member: 19"] Und das ist meine Melomanchildkröte. [ATTACH]12398[/ATTACH] Regarding your case. The room is spacious, with no doors to the corridor, which is good for the sound. The main longitudinal resonance is 33 Hz, the main transverse resonance is 48 Hz. Not bad. If I understood correctly, the listener's position cannot be changed - he is sitting in the middle of the sofa. One main system stands in the very corner, the second near the window. The first has the worst position in terms of exciting room resonances. But if the lowest frequencies will be reproduced by new phase inverters, this is not too important. Since the main systems and bass reflexes are spaced apart, it is highly desirable to provide the same distance from the listener to the centers of the subwoofers of the main systems and from the listener to the centers of the bass reflex speakers. In this case, there will be no problems in fusion of the speakers in the phase of the sound pressure. You have something like that. Determine the height at which your ears will be, and specify the position of the two finished bass reflexes in the room. The lower the crossover frequency with the main systems, the greater the difference in distance to the listener is acceptable. Maximum permissible phase difference between signals at a crossover frequency of 60 °. For example, for a section frequency of 200 Hz, this is equal to 29 cm. Everything described above applies to a path without time delays in channels, with second-order Linkwitz-Riley filters (quality factor 0.5). At the crossover frequency, they give -6dB, +/- 90 ° phase shift and ideal total amplitude and phase characteristics. Therefore, the bass reflex speaker should be turned on in antiphase to the subwoofer in the main system. If you want to increase the number of phase inverters to four, then this condition must be met for all four phase inverters. Otherwise, it will be necessary to introduce time delays into the path or manipulate the filter Q-factor, which is more complicated and worse. However, you have not drawn the position of the listener and bass reflexes in the room! Also report the height of the room and the height of your ears when listening. [/QUOTE]