Been doing a bit of A/Bing with my Pioneer SX550 and Marantz 2216a tonight trying to decide the winner...
I love the sound out of both with the hd800's, but the Pioneer has that certain something... It's the warmth mixed with great detail, hard to explain but it just sounds soo musical! Kind of like smooth milk chocolate. The marantz has the warmth as well, but is more mid-centric and richer sounding. Maybe chocolate with raisins in..? It's also a little more closer sounding. More in your face. But its the smoothnesss that is instantly more likeable to me with the pioneer.. Maybe playing better with the hd800's ?
The pioneer seems to have looser bass.. But it extends more. More sub bass. The marantz has more mid bass and has a little more punch and authority. Both amps have amazing treble, both sweet. But the nod goes to the pioneer for having less edge, where as the marantz shows a little hardness with raw recordings. However, the pioneer is a fraction 'brighter' at the top.
Its very close though... I'd be happy with either as a long time keeper. I used my Dacmagic for comparison because its the most neutral dac I own.
in a nutshell ; the Pioneer is more refined, smooth and dynamic (boring to some!). The Marantz more engaging and richer (fun?). My music preference is for classical and jazz so that's maybe why I prefer the former. The latter is probably better for rock. dunno?
Not much of a review, but I tend to find in general the more you think about it the more you let your mind wander too much and stray from what you actually heard... So short and sweet and let the things you instantly notice stay apparent!
Just thought I'd share this as they are both in the same price bracket.