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Alesis MultiMix 4 to a single QSC CP8?

Hi, I have an Alesis MultiMix 4 mixer and a single QSC CP8 speaker. The manual for the mixer says to use 1/4 TRS for the main outs. And the speaker has a female XLR input. So my question is, if I only have one speaker, should I get a dual 1/4" TRS cable that terminates at the other end as a male XLR? Is that the proper connection when I only have one speaker?

Alesis Multimix 8 USB (18V) Power Supply Needed

I was just given the Alesis Multimix 8 USB but my friend had accidentally thrown out the power supply with some other old electronics. As it would turn out, this is very hard to find. There are no after-market power supplies made, as far as I can tell. The specs are 18V 500 mA and here is a picture of what I need: