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In Reply to: RE: Beveridge? posted by airheadair on February 19, 2016 at 23:25:27
No, I have not asked RM the question. When I contacted his business in order to acquire a copy of the direct-drive amplifier schematic, I never got to talk to him directly. Once or twice I emailed him but never got an email response, either. However, his company was very prompt in providing me with the schematic, once I had sent payment.
In the pamphlet that Harold Beveridge concocted to go to purchasers of the 2SW, it does say that the low pass filter slope is 18db/octave. And I have always assumed that the high pass filter would have the same complementary slope, but that is not directly stated in the pamphlet. But I also have always wondered why there is that series capacitance in front of the amplifier input, which by itself would add a passive high pass filter with first-order kinetics. On the other hand, it does not seem to me that 6db/octave would be sufficient to sufficiently attenuate the demands upon the panels in the 2SW to produce bass response. So it is most likely a net 18db/octave slope with the gain maintained by an active element in the crossover.
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