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Connecting Gemini GVX SUB15P

I have a Phonic 740 powered mixer with two Phonic S715 speakers and a Gemini GVX SUB15P powered subwoofer. I know this is a terrible combination of PA equipment but it'll have to do because I am on a strict budget.

I connected the two S715 speakers into the mixer from the back main. Then ran a TS to XLR cord from the back of one of the S715 speakers into the subwoofer.

This was working great for awhile then one day the subwoofer stopped working. I don't know what caused it as a lot of different people use this equipment.

I know this setup worked with the "tape in" input with the RCA to 3.5mm hookup. But the prongs got stuck in the "tape in" input so I have begun using the AUX in input. Could this be the issue?

Please could someone tell me why the subwoofer has stopped working? Is it the fact that I am using the AUX input? Any help would be appreciated. Thank you.

Basic drawing of setup:
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Mixer and speakers:
Phonic Powerpod 740 Plus / S715 PA Package: Shop Pro Audio & Other Musical Instruments | Musician's Friend

Subwoofer:
Invalid Link Removed

Subwoofer cord that was working:
Amazon.com: GLS Audio 25ft Patch Cable Cords - XLR Male To 1/4" TRS Black Cables - 25' Balanced Snake Cord (NOTE: THIS IS NOT A MIC CABLE!): Electronics

AUX input:
Amazon.com: Hosa CMS105 Stereo Mini To Stereo 1/4 Inch 5 Ft: Musical Instruments
 
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