Yah I agree with 3db on this one. I had a similar problem the first time I connected my Studio's. Recheck all your connections, not just the interconnects.
My problem was related to the fact I was bi-amping my mains, and I had the mid/high connections not fitted properly so it wasn't producing the sound. Might be something as simple as that for you.
Also as jcPanny mentioned, compression may be a signifcant contributing factor. The more compression, the more level the overall volume is. The less, the more dynamic the range becomes.
One question though, have you tried playing around with the different options for sound decoding on the reciever? If so, note any big differences?