I will +1 on the Rogue Audio RP -5 piece. I only have the RP-1 but it is built on the same technology with less features. The RP-1 create nice space and air in my system civilized my class D amp. The RP-5 utilizes 12AU7 tubes. It also has a user configurable phono stage which is pretty cool ( maybe you current unit already has that). My RP-1 has been performing flawlessly for months now so I am really happy with it. I called Rogue before I bought the piece from my local dealer and chatted on the phone. Very nice helpful conversation. Lots of reviews on RP-5 out there as well.
I primarily stream Deezer at redbook quality and also spin vinyl. Really love how Mofi vinyl sounds through the system. My next move will be upgrading to an MC cartridge to see how the Rogue controls that.
Here is a quote from one of the reviews:
"I did not hear any vintage “tubiness” through the RP-5 — especially in the bass; the piano’s lower register was spot on. The hybrid design keeps the low end fast and clean. For a combo preamp’s phono stage housed in a full-featured preamp, the Rogue RP-5’s phono circuit sure is worthy of separate status. "
Here is the summary from Stereophile review on the RP-1 and again I agree totally with the "spacious" comment.
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In summary
I believe that Rogue Audio’s RP-1 will join the ranks of such preamp folk heroes as the Dynaco PAS, the Hafler DH101, the Conrad-Johnson PV3, and the NAD 1020—and the Apt Holman, the Supraphon Revelation Basic, and the Audible Illusions Modulus. All of these are moderately priced, high-performance models that countless audiophiles have used to step up from receivers or integrateds to separates.
However, the RP-1 was more effective than any of those classics at preserving a recording’s vital energies. I believe that the RP-1 is not necessarily a stepping stone on the way to something better: I see it as a fully worthy final destination.
Compared to any preamplifier I know of at anywhere near its price, the RP-1 reaches deeper into the music to excavate a stronger, more precise, more spacious musical presentation. Most important, it delivers music that lives. Highly recommended."