I bought the Clearaudio "micro basic" from Music Direct. My preamp just didn't have enough juice to give the Gold Ring Eroica on my mmf-7 enough get up and go.
After I hooked up the Clearaudio my sound was phenomenal. I got more output, dead silence between cuts, great dimension and response, and bass response I never knew my system was capable of. This is the single best improvement I have ever made to my system, and at only $300, It's a steal!
Hope this helps and Happy Listening!
Hififile