Hi, Have just bought Cambridge Azur 540R and Elac XL Set II speaker package with active subwoofer: http://www.elac.com/en/products/cinema/show.php?c=cinema2sets Elac speaker impedance is qouted at 4-8 ohms, nominal 6. Elac told me their speakers are OK for 100w per channel, and should be connected to no less than 50 W. 540R is 100 W per channel. First connected centre and 2 fronts from 540R using high quality cable and then wired them back (According to Elac manual) to 540R. Had to use smaller, cheaper cable as physically impossible to jam in thick cables twice into tiny holes at speaker connections. Sound from the 3 fronts and woofer was amazing, even at high music volume. Then connected 2 rears using same method but 540R kept cutting out at moderate volumes and cooling fan started kicking in. Figuring I was about to blow up the system, I ignored the manual I bypassed the Elac for the 2 rears and connected them directly to the 540R. Result - no cutting out but I am not convinced this is set up up correctly and volume from rears seems poor. Surely all speakers should go through Elac system? Have not messed about any more as it took me about 8 hours to get the thing wired up in the first place. Anyone out there know the correct way of setting this up?