Initial results were surprising to say the least. I came into this expecting to buy a MM-6, lol. I expected the Marantz onboard phono to be just passable. I expected a lower noise floor, greater separation, and better dynamics out of the MM-6. It did deliver a lower noise floor.
Before going any further I do want to disclaim that I am using a Marantz SR5013 AVR as my amplifier (with a Technics 1210GR). The MM-6 was connected to the CD input. I did not dig around in any settings and seeing as I have never used this input it is entirely possible that there is some under the hood digital processing taking place on this input that is skewing the results. I still want to dig into this; I am certain there's some means of doing a pure pass-through and once I enable this feature I may very well have a completely different set of results.
My first test track is not only one that I know every minute detail of from having heard it on many systems hundreds of times but also is one that is absolutely wall of sound in terms of total frequencies represented at any given time with lots of dynamic range and literal layers upon layers of sounds. This track promises to test the limits of any system in a variety of ways:
I played first on the Marantz to understand that the track is overall quite cohesive with a ton of bass extension across the board (I'm using a pair of Elac F6.2 with the Elac 3010 sub). All the different pieces that Maya brings to build this track are very well integrated tonally, nothing feels like it is stepping on top of anything else. I then moved to the MM-6 and while some sounds were immediately more present I would describe the overall tone as far more laid back and a lot of bass impact was lost. That tonal integration was lost to some extent, and some things felt like they were really mixed together as opposed to close compliments that build.
I went back and forth several times. The Marantz makes the opening keys sound like motherfucking keys, yo. Like this bitch has turned the keyboard way the fuck up and is setting the groove right into your brain straight from the start. It sounds like I am in a club listening to a PA set of speakers. Maya could be hitting these keys right there in the room with me. There's lots of air in and around them. I don't know keyboards that well but for someone who did we're getting enough signature here that a seasoned person could identify the exact model being used or what emulation was being used for it. The MM-6 throws almost all of that out, it's quite metallic sounding across all things treble and that thing
@Lee Newman was talking about as far as electronic music sounding more electronic is very true here.
Now, the bass is an other interesting angle. This track brings it in spades. There's the main kick drum, there's the lilting, walking bass, and there's the rhythmic sub bass. The Marantz is clearly a little muddier here although the lilting parts cause way more of a seasick feeling that I am certain Maya is trying to create. The MM-6 handles the bass well, it is present and never drops out and is absolutely never muddy at all. Overall, though, in everything it does, it feels compressed. the MM-6 feels cleaner like it won't let any one thing stand out, forced cohesiveness, like say a CD. IMO, the bass is too laid back. This track is supposed to heave you around with bass while your head swirls to the keys and vocals.
So back to the keys. At about 3:08 a repeating key riff appears that runs till the end. On the Marantz the characteristics of these keys as actual keys is very prominent. They just sound like some electronic mash on the MM-6. Like, if I didn't know any better this would probably be fine. It has elements of The Prodigy or Underworld where samples are processed, cut and fitted such that it's more of a sound than a character. The Marantz makes it obvious Maya played this riff on her own keyboard and then looped it and applied effects live.
Overall, this track is about juxtaposition. The bass and the keys and the treble all occupy their own corners with the listener in the middle being pulled and spun around. The Marantz 100% delivers this dynamic. Close your eyes and you can smell the sweat in a nightclub, you can feel that weird sense of the bass bins vibrating the metal roofing in the place. The MM-6 dispenses with this entire feel. It becomes like listening to the same track on maybe some really good laptop speakers or something where it all gets homogenized.
For fun I switched the system over to Spotify and played the same track (also to get the timestamp for the key passage). Playing the vinyl is still leagues ahead regardless which preamp is used although a lot more of the characteristics the MM-6 brought forth are present in the digital stream. It's less airy, harsher on the treble. It still is well separated while delivering an integrated experience and all those super cool swirlies are intact. But hey, that key passage at 3:08 is again an electronic mess.