I have used a tube buffer between exposure pre and Exposure mono amps with great results. I am currently using an ifi itube. At 300 buck it's a steal. Check reviews online. might be a cost effective way to make your system smoother with a larger soundstage.
Also I have heard alot of people in the past using croft pre with Exposure amps
Also I have heard alot of people in the past using croft pre with Exposure amps

