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RE: BiAmp Noodle

Connecting Amp/Crossover to Pre with balanced and using the shortest feasible speaker cables minimizes opportunity to pick up Any Stray RFI.
All things being equal, given sufficient wire gauge, I won't worry about speaker cable length until it hits maybe 10 feet or so. Maybe 15.
Case by Case basis.

Technically, a pair of 2 way speakers with a sub IS a Three-way and therefore Tri-Amped. I wouldn't know where to begin trying to Triamp a 2-Way speaker. ;)

Crossing the sub as low as 50hz, acts to remove the lowest octave from the Main Speakers addresses several considerations at once.
Crossover to sub is low enough to prevent ANY thought of localizing it.
Main amps are relieved of a small but real amount of power need, transferred to sub. This has the effect of moving the 50:50 power point a BIT higher, which with my 1.6 Maggies, is all to the good.

I'd never cross a sub above maybe 80hz, which is what you find in an HT receiver.
Too much is never enough

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