Is it the reduce noise floor that gives stand alone HT preamps that sweet effortless sound or are the internal components that different in comparision? Can preamp sections in todays higher end receivers compete or better preamps costing slightly less (due to no internal amps)? Ex. Denon 5800 vs. Parasound 2500u.. This is a question catered toward the HT side of things. Why? I'm afraid to spend money on a new receiver just to have 5.1 inputs. I have a separate amp.