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yes, RCAs are unbalanced. 1/4" (phone plugs) can be 2 conducter (TS = tip sleeve, unbalanced mono signal) or 3 conductor (TRS, tip ring sleeve, can be used for a mono balanced signal or a stereo unbalanced signal). XLRs are 3 conductor, and can be wired for balanced or unbalanced signals.
balanced.. it's a three-wire circuit - 1 hot (positive side of the wave, pin 2 xlr, tip TRS) 1 cold (negative side of the wave, pin 3 XLR, ring TRS) and a ground (pin 1 XLR, sleeve TRS) that shields the two internal wires.
to go from balanced to unbalanced, you can short the ground and cold wire together and use it as the negative, hot wire as the positive. a TRS jack will do this automatically - when you plug a TS plug into a TRS jack, it shorts the ring and sleeve (cold and ground) and it becomes unbalanced. this is one thing I like about TRS outputs, and the reason I prefer them over XLRs.
XLRs are nice for perm installed rack gear - they have a very solid connection (electrically) and lock in place physically. XLR cables go from male to female, not male to male like 1/4" and RCA cables. male connectors on the chassis is used for output. female connectors on the chassis are used for inputs - so, you can chain XLR cables together without a barrel (female-female) adapter. it also makes it harder to miswire stuff - you can assume which direction things go based on the gender of the jack.
so both TRS and XLR connectors have thier benefits.
but regardless, definitly look for a mixer with balanced outputs, if you ever plan to connect it to any pro gear or tour with it. if you plan to take said mixer to clubs or whatnot, it'd be in your favor have this. besides, just about any decent mixer has this!
idealy, it'd have both TRS and XLR (like the rane empath *drool) but adapters can be bought/made.
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