It blew our minds as well lol. Speakers were in the same position. He never uses any room correction for 2 channel listening.My Revel F328Be sound amazing on the low end. Bass punch is tight and dynamic. I position the dual rear ports 12" from the wall and they sit 9' apart in a 28' x 24' room. I use the RME ADI-2 DAC FS "Loudness" feature to dial in the bass just where I want it. It can shake the room. I have several other Tower Speakers but none offer the clarity and power of my F328Be with the RME/Purifi combination. When I hear someone claim lack of mid bass punch with the F328Be - it blows my mind. Something must be different in the speaker placement or electronics. It's pretty clear our experience is totally opposite.
Is it possible your friend did not optimize the AVR for each pair of speakers? In the case of Denon that would mean running a new Audyssey configuration for each speaker change. That's a newbie mistake that can easily offer poor to lackluster playback results. When I moved my F328Be off the AVR and simplified the playback with just the RME ADI-2 DAC FS and Purifi amp it sounded remarkably cleaner to me. The digitization and manipulation of the signal in an AVR is fine for Movies. But, for ultra clean music playback I much prefer the RME/Purifi combination.
I'll find out today how the amp works out for him. It's 300@8 ohm and 600@4 ohm.