I have a 10 years old RCA receiver; I re-tested yesterday against 2 Emotiva UPA-1 monoblocks. At the same level and NOTHING else changed, the RCA is a LOT bighter nad has noticeable less bass.
Brighter meaning it sounds like it's tone controls are turned all they up... but they're not. The are at 0; there is a lot of sibilance and the bass is receded, it sounds like you need to pump the bass some to get the same level of lows that the monoblocks are outputting.
Anyone that is interested in a test is welcomed; the differences above are "night and day".
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M80 v3, 2 x Emotiva UPA-1 Monoblocks, XPA-5, UMC-1 PrePro
Pro-Ject RPM Genie, Carver C2 Phono Preamp