@coop_301 , This link might be of some help:
Audio Electronics Review and Measurements Index | Audio Science Review (ASR) Forum
If you scroll down the column on the far right, you can see the as tested voltage outputs. Keep in mind that is the as tested voltage, as you know some units offer adjustable voltage output. Also, as per the sight's lead tester the "SINAD" measurements that seem to carry so much weight become somewhat academic beyond 115 dB, as he claims that to be the threshold of human hearing in anechoic measuring, which is a much higher standard than one might hope to achieve in a typical listening room. Better measurements are not a bad thing and allow for a greater sample to sample margin of error. But at some point, it just becomes a game of specsmanship. Still one can see those good measurements don't necessarily have to be expensive, and that some more expensive units and some that have garnered good subjective reviews appear to be broken.
I don't think going balanced via XLR is likely to work for you. The outputs are typically too high. You might find that just attenuating down to the ML 23.5's overload threshold will reduce the volume setting to the point where anything lower than maximum capable volume will introduce bit stripping. While balanced certainly has its advantages, especially in pro settings where noisy environments with many overlapping long cables are at work. In a home setting, this is less critical. I think you'll find that going single ended via RCA straight to your amp will still lead to cleaner results than going balanced via XLR through an active preamp. Most users tend to use their active preamps almost as buffered brakes rather than accelerators. Nelson Pass once made an outboard passive/active pre that only engaged the active stage past a point (2:00?) on the volume knob, very few users reported ever getting to the active stage.