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I am getting BFD soon, so I was worry about delay
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There will be a difference delay for each set of speakers that will be much more than the 1ms that the BFD offers. This would be a larger worry. If the rear speakers are at 4 feet from your listening position and the mains are 15 feet, that's a bit of a problem if the receiver doesn't have a distance control. I can't imagine they would sell a receiver today without that feature.
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did anybody try to modify BFD power supply 120VAC to 12VDC, so that it can be used to equalize the car sub frequency response?
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No, but you could simply use an inverter to produce the 120v from 12v. The BFD draws about the same current as a night light.....
brucek