Well I am searching for a new Receiver or Pre Pro and went to the Magnolia store today to audition what was available. I listened to Marantz,Denon and Arcam. All demos used B&W 804s. The Arcam 31 was first and it sounded clean crisp and clear, I thought to myself that it could pass and was a serious contender. Next up was the Marantz and forgive me for forgetting the model number but in any case it was a solid 2nd place. Now came the Denon 6700 and I can say to my ears it was the biggest disappointment ever. Even the Mrs. Looked at me as if to say where did the musicality go. It’s sad to Denon selling junk like this to consumers. Even sadder that people actually buy this stuff. I apologize for the rant in advance. Mike
You would need to look closely at their setup...
A fair comparison can only be made comparing the un-EQ'd pass through performance - as once you activate room/speaker EQ/correction - the target curves differ, and things become very very sensitive to minor variables (like Mic location varying by a couple of cm).
If one or all of them had their Dirac or Audyssey (or other) RoomEQ turned on, then the entire comparison becomes meaningless!!!
Having said that.... the amps being compared are quite different, and the speakers involved (B&W 804) are quite a difficult speaker to drive, with impedance dropping to 3 ohm and steep phase curves - so the amps in use need to have high current capabilities.
The Arcam/JBL Class-G amps will do OK with these speakers where the D&M AVR's with the exception of the AV1/AV10 flagships, may well get themselves into trouble... In the Onkyo/Pioneer/Integra family, I would probably not try anything below the RZ70/LX805/DRX8.4 flagships with a set of 804's - for the same reason... (yep there is a reason that the flagship models weigh it at circa 50lb's / 22.5kg - most of which is in the power supply for high current)
For my own purposes - having worked out that the preamp sections of all of these were pretty much on a par, I took a step down the ladder and saved some $$ by going for the Integra DRX 3.4 (enough channels for my 5.1.4 layout, Dirac processing, and amps for the height and surround speakers....) - and combining it with external amps to drive my known to be difficult front speakers.
At some point, once Dirac ART is available, I will trade up to something ART capable - whether I then retire the external amps, will depend on what it is, what it's amps and power supply are like, etc... (it would be nice to simplify!)