Final comment on this before I unsubscribe from this thread.
If you have distortion problems with you ddj sx mic input, using an xlr or jack input makes no difference, nor will turning down the gain.
You will need a -20dB in line mic attenuator.
They cost about £10. I picked one up for. £4.99
This will solve your problems of distortion. I've been using mine for two months now with no issues. No amount of returning units to pioneer will help so don't bother.