hey guys..was wondering about behringer xenys mixer..can i just connect a pair of speaker behind it and it's already complete ?? can use mic to sing and plug in instruments to play ?? thanks yea guys

Techincally.... you can.
I have a beringher mixer where I route my Line6 UX2 into and I used to hook up a microphone to it just fine.

if your speakers are active then yes. Because the Xenyx has no built in power amp. So if you are using passive speakers, you still need a stereo amplifier.

sure u can , but like bassix say u must have active speaker , or bough some power amp then using line out from mixer to line in power amp, then from speaker out power amp to your speaker.

if you use mixer just for personal , u can also connect to you PC speaker or hi-fi system .