Numark NS7 2 with passive speakers and no amp

I have a Numark NS7 2, and i got a pair of Cerwin Vega V-12F passive speakers...but no amp. I was wondering if it's possible to connect the speakers to the master out on the NS7 2 mixer with theese cables: .... or do I have to get and amp for the speakers then connect the amp to the NS7 2?
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