In reply to:

I don't think the Yamaha can do that. AFAIK it's just one crossover frequency picked from a short list of values.

I think John #1 is right, AFAIK, the only major manufacturer short of higher-end processors and boutique brands that offer individual speaker crossover points are the HK line of receivers. Yamaha offers global crossovers (same for all speakers) something like 40/60/80/100/120/140/160 i believe.

"Chickens don't clap."