Can somebody explain the benefits of using a capable receiver such as a Sony STR-DA4ES as a pre/pro then running to a dedicated amp (like an Outlaw). I am slowly saving up to buy a STR-DA2ES and I think it will be the coolest piece of audio equipment I will ever have. I just can't fathom using a 4ES as a pre/pro only. Am I going to be missing something by running a "conventional" setup? Thanks, you guys are my heroes!