AVS Forum Addicted Member
Join Date: Jan 2001
Location: upstate NY
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"Passive bi-amping" (where you send the same signals to both sets of speaker drivers and use the speakers' internal crossover networks to separate the sounds) provides no advantages whatsoever with modern solid-state amps. "Active bi-amping" with electronic crossovers optimized for the different speakers on the different channels can produce some improvement. Few people have the knowledge or patience to do the latter, though.
Nonetheless, always pull more wires than you think you'll need. It's usually a royal pain to do it later.
Also, you should be using the same kinds of (standard) speaker cabling for everything. There's nothing really special about any of the special bi-amp cables except that their makers have found special ways to persuade you to give them more of your money.
If possible, you should consider installing conduit and pull cables through it. Conduits would be a lot more convenient later, especially if you found that the cables you pulled were defective.
Marantz SR7009 avr + MM9000 amp --> Atmos 7.1.4
Fronts=NHT 2.9+AC2, FH+TM=DefTech PM1000, LCR+TM amped