I am not familiar with current JRDG preamps, but have had many of their past designs amps (1, 2 and 8) all driven thru either a Consonance or a Coherence preamp (agreed with Raquel here).
I would consider the new Rowland Sinergy preamps in your case, design considerations play heavily in JRDG setups in my experience.
Fernando
I would consider the new Rowland Sinergy preamps in your case, design considerations play heavily in JRDG setups in my experience.
Fernando