Spectral and Accuphase

well, i cannot say that i know much about the P7000 sound. however, my friend owns a DMC20-II as well & it drives a Plinus SA-250 Mk4.
From whatever I know about Accuphase, it appears that this company's gear is 'musical' rather than 'accurate'. similarly, to my ears, the Plinius gear is musical rather than accurate. In my friend's system, the DMC20-SA250 combination sounds really very good. Speakers are B&W N803.
So, extrapolating from my limited experience, it would appear that an 'accurate' preamp driving a 'musical' power amp would be a good match.
This is based on just 1 data point!
Hopefully other members w/ more experience will also chime in.

I don't remember all the details, but, I recall that some Spectral gear can be very tricky to deal with. Seemed as though Spectral stuff needed to be mated with Spectral and use special MIT cabling. Tread carefully!

Spectral preamps can be used to drive non-Spectral amps. I drove an Audio Research D115 Mk. II for years with a Spectral DMC10-delta. The results were quite satisfactory. Most, but not all of the amplifiers from Spectral require the use of Spectral preamps, interconnects and speaker cable.