I wonder will this 4.4 to 3.5 Connector work?
I’m not sure what “this” connector is sorry. But if it is a headphone 4.4mm balanced cable to a 3.5mm male plug for a 3.5mm single ended audio out I’d say no, the wiring configuration will be wrong.
You need to use a single ended interconnect cable and an adapter to 4.4mm male.
Using a 4.4mm interconnect cable with a headphone adapter to 3.5mm male creates a significantly different wiring arrangement.
Seems like the same end result but it emphatically isn’t.
As CH23 said, the negatives need to be unconnected, in the 4.4mm cable and adapter to 3.5mm male the negatives short to ground as that is what is needed for a single ended headphone connection but is exactly what you don’t want for an interconnect.
I have two adapters due today. I’ll plug them into a 3.5mm to 3.5mm cable and a 3.5mm to 2 x RCA cable, check the resulting wiring set set up with a continuity tester then test them with the Diablo.
I’ll report back when I can confirm definitively that they work.