As silverhead has implied, that problem has arisen because the y-cord you're using is wired so that when it combines the POD's separate left and right outputs, they are arriving out of phase with (hence cancelling) each other at our mono input to one of our two L2t speakers.
I'm guessing that much of this dilemma arises from our misunderstanding of the "brief" ...and I hope that re-stating it this way might help:
- We want to maintain the full "richness" of our HD500's "stereo ambience" by having each "half" of its output directed to "its own" speaker in our "left" and "right" rigged pair of L2t enclosures.
- Of those enclosures, one will become our "master" or "control panel" that will then only need a single Line 6 Link cable to feed its opposite number.
- It then follows that our POD should only require correct analog connection to our "master" enclosure for correct "imaging" (including our POD's "front and centre" XL mic input) to be created across both of our enclosures.
Here's the rub:
If my interpretation that led to the above "brief" is correct, I'm thinking that any MONO connection from our HD500x to our "master" enclosure would seem to defeat the main purpose of this exercise, ("stereo" HD500 effects) ...even after we notionally rectify the cancellation caused by an incorrectly configured y-cord.
Accordingly, it seems to me that we would really need to use TWO separate analog cables from our POD's outputs to the STEREO RCA "Line Input" sockets of our "master" L2t, being either:
- A pair of unbalanced guitar jack to RCA cables, or
- A pair of balanced XLF socket to RCA cables, wired XL pins 2 to the "centres" of each RCA plug, XL pins 3 to the "skirts" of each RCA plug, with their "shields"or "outer braids" connected ONLY at the number 1 pins of our XLF sockets.