Thanks John - I agree about the PITA factor!

The REL has several (3) inputs, and will handle a speaker level (ie power amp) input at the same time as a high level (ie LFE) feed or a low level feed (preamp) - however, there are not separate gain levels for each input - only one overall gain setting. It's a slightly older REL, Stentor II, without a bypassable crossover.

Please bear in mind that when the stereo pre is working, the 568 will NOT be supplying any bass via LFE at all, as only musical sources and not 5.1 will be playing. For example, I will connect a CD player direct to the Krell preamp & not through the 568.

The only things I will connect to/through the 568 are DVD and a satellite decoder - so, the 568 LFE should only be active for these sources right?

Multiple cables to the sub are not a big deal because of its relative location.

I have all speakers set to Large anyway, as recommended by REL, and in fact it sounds better that way, to my mind. I suppose if I played films really loudly I'd blow the rears and centre to pieces, but that is another issue entirely.

I think the issue will be, as you say, LFE on the 568 as well as the preamp BOTH supplying bass to the sub ONLY when I am watching a film. Is that right?

Supposedly the REL will handle this OK but I'd be in danger of having overblown, booming bass???

Thanks for any additional comments & your help so far.

Paul