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RE: Distortion reduction in H-frame ...

Posted by BDP24 on March 21, 2017 at 17:14:18:
In a W-frame, the two woofers are always mounted in opposite directions (typically with the woofer on the bottom baffle facing forward, the one on the top baffle facing the rear of the frame, it's backside being visible listener). In an H-frame, the two woofers can be mounted facing in opposite directions (one forward, one rearward), but they don't HAVE to be. Danny Richie recommends doing so to balance the weight/mass of the woofers in the frame, the magnets being far heavier than the front end of the driver. When so mounted, the two woofers are wired in opposite polarity, of course. Ric Schultz of EVS uses the Rythmik amp and GR Research 12" woofers in his version of the OB/Dipole sub with the two drivers mounted on a flat baffle, both facing forward. He feels by doing so the woofers are in exact time alignment, the sub sounding better as a result. Richie argues that the wavelengths are so long at bass frequencies, that time alignment of woofers in an OB sub is not critical. But as to force-cancellation and harmonic distortion reduction, I'm not sure about the difference between the H-frame (with opposing drivers) and W-frame.