Do both of the above outputs operate at same time? If I have a speaker that accepts XLR for the powered bass portion but regular high level connections for the mid/treble portion can I connect xlr out of the preamp directly into the speaker, for the high level connection can I run RCA out and into the amp and then connect via speaker wire? I know that amplifiers require you to specify RCA vs XLR but I don't see any such requirement on the preamp. Thanks.