Why not at least try the Manley preamp with your Snappers? Usually manufacturers play particular close attention to matching and optimizing partnering components.
Preamp to pair with Manley Snappers?
I currently have Sonic Frontiers Line 3 into Manley Snapper Monos or Atma-Sphere M60 Mk II.2, driving Silverline Sonatina IIIs. Audience Au24 balanced interconnects and speaker cable. Snapper monos clearly not as transparent as Atma-Sphere M60 Mk II.2s but more low end control. Other than the Atma-sphere MP3, are there other preamps that might deliver more mids than the SF Line 3 but still maintain bass and treble?