@drubin I’m indeed since yesterday on audiogon (but since decades on Dutch audio forums, also active as a DIY designer, though less active due to my busy job). Even if I would be here for long times, the above represents only a sonic opinion from whomever.
The AX-7e is a very good amp, I had it since 2005, and used it with a lot of pleasure. Many people listening to it were always surprised about the amount of grandeur from this little box (typical reaction; "60W, really???"), and praised the musicality and velvet treble performance (don’t confuse it with soft or coloured). I assume the diamond and equilock circuits that have beeb introduced into the Ayre products since then lifted their products to a new level. The EX-8 is reported to be close to the AX-5, a bit less subtle and with a higher "fun" factor.
I did a thorough audition of the EX-8 (together with some friends), and we all agreed on the EX-8 amplifier part outperforming the AX-7e. I shared my notes with Ryan Berry (Ayre CEO), and he said he recognised my observations, being mostly what he also hears himself.
For the digital side it was a mixed bag. Though the EX-8 is very good, the QB-9 Twenty outperformed the digital inputs of the EX-8, exploiting more texture, sounds and reverb isolates better and decay into a darker background, treble is more airy, flanging, and pinpoint-able, the sound stage is more 3D (depth and width), and overall the overall sound embraces you more. The EX-8 sounds like the QB-9 DSD, and I assume the USB2 update (as introduced for the QX-5, under development for the 8 family) will bring it to the same level, as all the other electronics are equal to the QB-9 Twenty. The NET2 update, recently introduced for the QX-5 and also planned for the 8-series in a later stage, may lift the EX-8 to a solid ROON end-point, maybe making the Aurender and QB-9 redundant.