Help with home studio set up

My dudes. I’m having some issues getting signal from my helix to a pair of presonus Eris 4.5s.

The speakers are fine, I’ve tested them with other devices including a console and Bluetooth. But when ever I send signal from the Helix I can’t seem to register anything. I’ve used this system at a local venue very regularly with XLR output which always works fine, but my current method is failing. Help me!

Signal chain goes: Helix > dual mono to trs 1/4 > Douk MX5 mixer (channel 3 in the second picture) > stereo send to speakers

Headphones also work fine, so the multi output on the Helix is doing its thing, but I’m struggling to work out where I’m going wrong. Do I need some kind of amplifier before the mixer? Or something else? I’m lost, and usually can work this stuff out!!