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In Reply to: BiAmping Speakers with Built in XO posted by HiOnFi on April 28, 2014 at 04:18:46:
...of stereo cables and poweramps. What's the preamp's output impedance?
Adding high-quality one-male-to-two-female splitters will alter the sound less than adding an electronic crossover with its hundreds of solder connections, pots, etc. Calculate the net impedance of the 2 poweramps you wish to use with this calculator...
http://www.1728.org/resistrs.htm
If the poweramps' net input impedance is at least ten times the preamp's output impedance, you're good. You'll probably need a way to decrease the gain of the higher-gain poweramp; does it have input-level controls?
If you emotionally NEED to use the electronic x-over, disable its filters. If they can't be disabled, set the filter points way beyond the speaker's internal filter points to get the extra filters as much out of the electronic way as you can. For instance, if the speaker's split between low and high frequencies is, say, 200Hz, set the x-over's low-pass filter to at least 800Hz (two octaves higher) and the high-pass to as low as it will go, and if it can't be set to at least 50HZ, its phase errors will decrease sound quality at least somewhat. Palustris is correct when he says the designer of the Swans' crossovers spent a lot of time correctly designing the speakers' crossovers, and adding additional filter slopes ahead of the speakers' filters will indeed alter the sound, for the worse.
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Follow Ups
- HiOnFi, you seem obsessed with your preamp's 'inability' to drive 2 pairs... - jeffreybehr 04/28/1411:25:20 04/28/14 (1)
- RE: HiOnFi, you seem obsessed with your preamp's 'inability' to drive 2 pairs... - HiOnFi 13:41:32 04/28/14 (0)
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