I use a Sim Audio Moon P-5 preamp with my EMC-1, and I love it. The Sim has only one set of XLR inputs, however, so you won't be able to use the balanced inputs on one of your CDPs. By the way, why are you using both an EMC-1 and an SCD-1?
Pre-amp questions for SCD-1 & EMC-1
As of this moment I am using a Theta Casablanca as my processor for my Sony SCD-1, and EMC-1. The amp is a Pass Labs X350. Would taking out the Casablanca and opting for a pre-amp improve my sound quality. If so how much of a change should I expect. My second question is what pre-amp do you recommend? I would love to use the XLR connections on both of these players, so if you could please recommend pre-amps w/ balanced connections.