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Transient response of actively filtered speakers
I have some vented speakers with an F3 of about 40 Hz in an EBS
alignment. I have severe room interaction problems, clearly audible and confirmed by LSPCad: a VERY deep valley around 60 Hz. I can't solve it without really inconvenient furniture rearrangements, so I'm going to add a subwoofer (closed, Q=0.7, F3=37Hz) actively crossed over to the main speakers with a 4th order LR filter. I will have to use a xover frequency of about 100 Hz, above which the main speakers behave reasonably well where they are placed. Luckily I have found a very convenient spot for the sub where its response will be very flat and it's at exactly the same distance from the listening position as the main speakers. Just for fun I checked what would happened if I closed the vents in the main speakers and what I get is a Q of about 0.5, although the rolloff starts slightly above 100 Hz so there would be a small dip (less than 1 dB anyway) in the overall frequency response. I understand the closed main speakers would have a much better transient response than if I leave them vented, but I'm not sure about their contribution to the overall system transient response. Since in any case I'm filtering them electrically with a 4th order slope, does it really matter how they are aligned below the xover frequency? In other words, will the overall transient response depend on the box alignment of the main speakers, or only on the overall system response, crossover and sub included? Many thanks in advance, Carlos |
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