Razer Seiren X headset monitor output not working (?)

Hello, I've just bought the Razer Seiren X mic. The headset monitor ouptut (3.5 jack) on the Seiren X does not seem to work whatsoever. I've tested it with my Blackshark X headphones, a pair of Sennheisers, and a pair of Audio Technicas. So far: 1) The mic works and picks up sound beautifully. 2) The headset monitor output does not work with these settings: - Control Panel > Sound Devices > Audio Output set to Speakers (Razer Seiren X) - Control Panel > Sound Devices > Audio Output set to anything else (like Speakers 7.1 Surround Sound, SPDIF-Out, or any other audio output my rig has). 3) The headset monitor output remains silent with the mic's gain knob in any setting and/or the headset's volume control in any setting. I'm kinda confused as what to do next; there's very little information about this issue on the web and I got a gut feeling I do something wrong OR my Seiren X is defective out of the box.