Thanks, I'll be happy to help if I can!
I don't know if this is the right solution for stereo, in my experience the term "monitor feed" implies a balanced mono signal over an XLR cable. Everything is simpler this way, as a stereo signal comes with some tradeoffs. You either have to run unbalanced signals, which can be problematic (crosstalk and other interference), or you have to run two separate balanced signals which means more cable to manage (and you'd be hogging two channels on the monitor mixer).
How about power, will you use a separate cable for that?
The idea in my setup is that the IEM signal is protected by being balanced, while the bass signal is protected by being buffered. This is not a foolproof solution, but an acceptable compromise. I have about 4 meters (12 ft) of cable, and crosstalk is negligible.
The greatest challenge is finding a cable that does the job without being too thick or stiff. If stiffness is not a problem, a Cat7 network cable might be a good solution. It has four individually shielded twisted pairs, so you could use one pair for R, one for L, one for bass and one for power (shield for ground, of course). You could even connect one half of each unbalanced signal pair to ground (at one end only!) to improve shielding even more (for power, I'd use both conductors to reduce voltage drop).
I actually gave this solution some serious thought, but for me, the stiffness (and ugliness) of a Cat7 was too much of an issue. I haven't tested this, so I can't promise crosstalk won't still be a problem.
The simplest solution: Use the belt pack as is (with a battery, no mods), then get the stereo feed from a dual XLR and run a separate guitar cable for the bass signal. Or solder a custom cable with split connectors for this.
I don't know if this is the right solution for stereo, in my experience the term "monitor feed" implies a balanced mono signal over an XLR cable. Everything is simpler this way, as a stereo signal comes with some tradeoffs. You either have to run unbalanced signals, which can be problematic (crosstalk and other interference), or you have to run two separate balanced signals which means more cable to manage (and you'd be hogging two channels on the monitor mixer).
By "shared grounding", do you mean they share the same shield? Crosstalk in this scenario indeed comes from the pin-2 and pin-3 conductors being close together inside the same shield. (Shared ground implies connected to the same ground rail, which everything should be at some point. How these connections are made is also an important matter, but it has to do with avoiding ground loops, not crosstalk)
You could maybe use one half of the dual xlr for the stereo signal, a bit of crosstalk between right and left might not be that big of a problem. Then use the other half for the bass signal.
I'm not sure I understand the question, could you be more specific?
This would depend on the cable. Again, "ground" and "shield" carry different meanings, you would gain nothing by using separate pins for bass ground and IEM ground. Sure, you can use separate shields for them (if the cable has them), but both shields should be connected to the same ground pin.
How about power, will you use a separate cable for that?
Buffering the bass signal will make that signal less susceptible to crosstalk, but it can still induce crosstalk into other signals, especially if these are unbalanced.
The idea in my setup is that the IEM signal is protected by being balanced, while the bass signal is protected by being buffered. This is not a foolproof solution, but an acceptable compromise. I have about 4 meters (12 ft) of cable, and crosstalk is negligible.
The greatest challenge is finding a cable that does the job without being too thick or stiff. If stiffness is not a problem, a Cat7 network cable might be a good solution. It has four individually shielded twisted pairs, so you could use one pair for R, one for L, one for bass and one for power (shield for ground, of course). You could even connect one half of each unbalanced signal pair to ground (at one end only!) to improve shielding even more (for power, I'd use both conductors to reduce voltage drop).
I actually gave this solution some serious thought, but for me, the stiffness (and ugliness) of a Cat7 was too much of an issue. I haven't tested this, so I can't promise crosstalk won't still be a problem.
The simplest solution: Use the belt pack as is (with a battery, no mods), then get the stereo feed from a dual XLR and run a separate guitar cable for the bass signal. Or solder a custom cable with split connectors for this.
