I'd suggest that you play with the crossover settings a little to find what you like, but here's my thought for a starting point:

Mains: 60Hz or 80Hz (80Hz would be an octave up, which is a common recommendation)

Center: 80Hz (100Hz might be worth a try, too, since it would be a full octave up)

Surrounds: 100Hz (might also try 120Hz, just to see what you think of it)

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gonk -- Saloon Links | Pre/Pro Comparison Chart | 950 Review