Using Mics with the DDJ SX2???

Which Rolls mixer? There are dozens of them!

If you're going to connect the output of this mixer to the XLR mic input of the SX2 then you need to ensure that it's mic level, not line level - or you will overload the SX2 XLR input.

Rolls do make some mixers that can at output mic level. Depends which one you're looking at.

Also which wireless mics will you be using? Again, make sure the inputs of the Rolls mixer are suitable for the output levels of your wireless mic receivers.

I was looking at this one.

http://www.fullcompass.com/prod/133961-Rolls-MX51s?utm_source=googleps&utm_medium=shopping&utm_campaign=googleps&st-t=googleshopping-all_products_low_bid&vt-k=&vt-mt=&vt-pti=133961&gclid=Cj0KEQiA-f3CBRCbluKf4vu008kBEiQAl-iGq9flc7hOETshNFou9XRgwU1tejL6K2yfbld2ZydVC_AaAkVI8P8HAQ 

Yes, however, I am looking to use 3 or even 4 mics, wireless. And not have to occupy the 3rd deck

Ok, but the mixer you linked to only has 1 mic input.  Also, keep in mind that connecting a line-level source (such as mixer output) to a mic-level input will cause the sound to be loud and distorted because the line signal is much stronger than what the mic input will accept.

Thank you very much for your input.

Can you offer any suggestions for what I'm trying to do.

I haven't done the research, so I don't know of any specific products that can do this.  Just make sure that the product you buy has a mic level output.  If not, you will also need to buy a line level to mic level converter.