This is about whether to chose balanced mic cables or unbalanced instrument cables to connect keyboard to mixer.
The keyboard offers two sets of output connections: "Balanced Out" (L/Mono and R) using XLRs, and "Output" (L/Mono and R) using 1/4" jacks. The connection diagram in the manual illustrates cables using TS plugs with the latter; that and the labeling suggest unbalanced output. The keyboard manual is silent on voltage or impedance levels, mic/line/instrument levels, etc.
I can connect the keyboard to the mixer via:
- mic cables with XLRs into the mono channels (-5 to +50 dB gain available)
- instrument cables with TSs into mono channels (-15 to +30 dB gain available)
- instrument cables with TSs into the stereo line-in channels (-20 to +20 dB gain available)
Should we want stereo keyboard, we have capacity in the mixer (so far) to dedicate two mono channel strips, or we can instead use a single stereo channel strip. Either way, I can adjust various gain/fader/etc. settings to achive pretty much the same levels on the meters, same volume in the room, etc. without clipping.
All the mixer's 1/4" jacks are TRS (but I think keyboard output is unbalanced.) Distance from keyboard to mixer is usually about 20', sometimes slightly less.
Should I favor one or the other cable/connector type? And if so, or not, it would still help to know a bit more of the "why?"