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Head Mic (wired) buzzing problem?

Posted: Fri Nov 06, 2015 12:50 pm
by advid
....I'm using a good old Shure SM58 into my PA900 using harmony/reverb on songs etc etc. Works fine. (almost) silent at all levels going into internal speakers OR in Bose L1c for stage/gigs etc.

Just purchased a (cheapish) wired head mic....

Plugged into my home setup (Torque Stereo Keyboard amp - 50 watts per channel and AR7 speakers) it works really well... (almost) silent at all levels up to feedback...

When plugged into the PA900 it's buzzy/crackly/noisy totally unuseable....

Anyone help me with WHY ? (Why does the PA900 not have an earth - just a 2 way figure of eight lead --- this is the UK ?)