That's the Monster Y-Splitter. Either Am-Dig is re-selling those or found the supplier for Monster! That's funny.
You just want to make sure that there is no wire in the Y as cable of any length will change the impedance. Solid connectors will not. Trying to stay 75ohm.
I picked up a CO2 to use for my MiniDisc Recorder that I use for backup/car/other stages at festivals. I need to do some in home testing on that thing, I keep hearing about these drop outs! So Far So good though.
Does anyone know if this is in any particular mode of the CO2?