I heard the Jeff Rowland Concentra 1 Integrated driving a pair of Vienna Acoustics Mahler speakers and was very impressed. It's an excellent sounding amp with plenty of power to drive most systems. Looks great also. I have the JR Synergy IIi preamp, so I like the Rowland sound. I see this amp on Agon right now for $2700. Rowland has a 5 year transferable warrantee which migitates your risk of buying used.
