The differences between the Onkyo 787 and 7.1 (and I assume the 595 vs 5.2 and 696 vs. 6.2) are obvious from a cosmetic, feature and warranty point of view. But what are the differences internally, if any. Are the DACs, DSPs, CODECs, capacitors, power supplies, heat sinks, etc identical or truly different? Are the internal parts interchangeable? Integras website "suggests" they are better engineered yet the specs for the 787 and 7.1 seem identical? What's the REAL truth?????