TX buzz

Just recieved TX15 speakers. powered up intending to connect from old phonic mixer using rca to mono phono plugs.

Switched over from line to mic (No phono plugged in) and get a loud hum reminds me of when a turntable wasn't grounded back in the day. Connected up and fed signal in but the hum distorts and muddy's the sound.

I have ordered rca to XLR cables to try as there does not appear to be a feedback issue on the line channel.

(I did obviously try the ground button to no avail). Bothe speakers did this so i assume it's a tech issue vs a fault?
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