Thanks for your reply Dante!! Ive decided to safely reduce the crossover down to 110Hz on all. So with regard to Ohm you would say it's safer to run the Alumni front/rear/centre which all have a nominal impedance of 4 - 8 Ohm printed on back of the speakers at 8 Ohm? In the manual it reads: Reference Power Output (8 ohms 1 kHz, THD 0.7%) Front: 110W +110W Center: 110W Surround: 110W + 110W Sur Back: 110W + 110W Reference Power Output (4 ohms 1 kHz, THD 0.7%) Front: 100W +100W Center: 100W Surround: 100W + 100W Sur Back: 100W + 100W Just when you think you got one thing sorted (crossover) another pops up LOL - Thanks again!!