I don't know if the adapter will double the voltage coming out from preamp. But let's say - if it does, then you will have "gain" in the system. With gain, you will have to go much lower on the volume knob. But again - just a theory - since I am not sure if adapters will double the voltage.
XLR or RCA cables
In my system I have an Audible Illusions preamp that only accepts unbalanced (RCA)outputs while my Ayre amps accept only balanced (XLR) outputs. I am currently running 2 meter RCA interconnects with adapters at the amp but was wondering if running XLR cables with an adapter at the preamp would offer any improvement. Anyone have any thoughts on this? Thanks.