Thank you everyone for your help so far.
Shadorne: Maybe another RSP1068 can affirm but AFAIK setting the channels to or near max is a common issue. Someone told me once that this pre/pro gain was low and this issue was a result.
Steuspeed: I understand and agree with your point of view but what is the remedy for this issue other than a phantom center? I guess this should be a fairly common scenario with 2CH on tubes and the rest of speakers on SS for HT. I guess compromise is necessary in my situation (different speaker as CC and also pre and amp) but how do I minimise?
Chadnliz: Thanks very much for the tip. I have had the pro for about 2 years but never knew that you could set the trims per channel. I guess I should have read the manual more carefully :-)
Regards