Hello RdW,I still have my 520. With a limited budget, I got an opportunity to move to a 525 for a reasonable price. Point is, there is little to no info or reviews to verify if this really is a good idea, except that people are debating if this is a class-D preamp because of it switched power supply. Cyril says not; it is a class-A so I believe him
The 520 however is still in the TAS '21 buyers guide reviewed back in 2013 by JV. And I do love it as I said earlier. Any views?
I have never tried soulution 520 but got my 525 back recently(ordered ch L10 but have to wait). I am using 711 as power amplifier so there shouldn't be any matching problem. My opinion is still the same as my previous post. 525 is a pretty good preamp, but ch l1 has better texture and reality of music. My description may not be very precise, because I actually used ch l1+x1 on my system.
Maybe you can try a demo L1 on your system? That should help a lot.