Thought some folks might find this useful: I have a 4ms Listen I/O that I had previously connected to their Listen Up module (which passively adds 1/4" TRS ins and outs to the module), and I just got a Performance case and was wondering if I could replace the Listen Up with the case’s built-in 1/4 TRS jacks. Turns out it can be done and is pretty easy!
You need to make a hybrid connector cable because the connectors are slightly different even though they look almost the same size/spacing - don’t force it or you might break the plug. I made the cable by splicing a 4ms jumper cable (Audio Jumper ) into an Intellijel connector cable that Intellijel customer support generously sent me (I’m not 100% sure what the part numbers for the different headers are and it appears you may only be able to buy them in quantities of like 1 zillion at a time anyway; I believe this is it, but I can’t vouch for the merchant https://hubtronics.in/1274 - so thought it was best to go directly to Intellijel).
Anyway, the pin out for both modules has ground in the middle and left/right on either side; the 4ms board and connector can be attached either way but the Intellijel Performance Case PCB connectors can only be connected one way, so if you try to do this, I’d recommend going like this:
- cut your 4ms jumper cable in half; you’ve now got 2 4ms-side connectors
- get 2 connector cables directly from Intellijel or as mentioned find the part elsewhere
- cut the end off the Intellijel connector cables
- solder the two cables together, making sure that the middle wire stays in the middle (it’s the ground) - as I said above, since the 4ms connector can be attached to their module in 2 different ways, it doesn’t matter which ones you connect as long as you keep ground in the middle. Use heat shrink and/or electrical tape to keep the strain off the wires after you solder; if you’re using heat shrink, remember to put the heat shrink tubing on the unconnected wires before you rejoin them!
- Plug the thing in, power up, and test the case jacks; if the stereo signal is flipped from how it should be on either the inputs or the outputs, unplug the spliced connector cable’s connector from the Listen IO side, flip it 180 degrees, and plug it back in.
That should do it! Hope that’s useful; I managed to grab 4hp back in my case by not needing the Listen Up anymore.