No sound from my TS Sub 15

Just trying my TSSUB15 for the first time today and it allows me to route sound from Left Mono In, and then Left Mono out to my TS12 Speaker. The speaker is working fine, but the Sub has nothing coming from it.

I held my hand in front, adjusted the volume on the sub, turned the speaker all the way down to make sure any vibrations I was feeling wasn't from it. The clip lights up on occasion if I have the sub volume all the way up. Is it possible I have a DOA product?
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