JRDG Model 625 is the way to go.
Best amp to Partner with Jeff Rowland Criterion
I have a Rowland Crtiterion Preamp and Rowland 312 Power amp. The 312 is amazing in its neutrality and transparancy, but it's NOT the last word in dynamic capability and low end frequency extention. Anyone had a chance to try out other power amps with this world class Pre?