Can i connect an Ipod directly to a pro amp without a mixer?

Yes you can. Exactly the way you stated above. Except you should use a pair(2) of speakers instead of just one since the amp is a stereo amp. Basically all you're doing is adapting from your ipod's 1/8" stereo mini into two seperate 1/4" TS connectors in order to feed the stereo line level signal into the amp. Then simply hook up a pair of speakers(L/R) to the amp, turn your ipod's volume all the way down, power the amp on, set the amp gains at max, then just control the volume using the ipod. You won't damage anything. Unless your speakers can't handle the amp's full power and you carelessly turn it up too loud and blow out the speakers. I've hooked up my ipod to my Behringer EP2500(450Wx2@8ohm) in this way countless times. One thing I'd like to clarify is that in the audio world "active" and "passive" are the total opposite of one another. Active means that it requires an electrical power supply as in powered(built in amplification) speakers. Passive speakers do not have power supplies so they must rely on an outboard amp to power them. I assume you were referring to passive speakers. PA is not an acronym for "passive active" if that is what you were thinking. PA stands for public address. Another option you might want to consider is to buy a single powered speaker that has stereo inputs and a "slave" speaker output. That way all you need is to hook up directly from the ipod to the back of the speaker and then plug the speaker's built in amp into an electrical wall outlet to power it. If you want to upgrade to stereo sound later you can then buy a matching slave speaker that will hook up to the master unit. The added benefit of this option besides convenience and ease of use is that the speakers are already matched to the built in amp's power. Either way will work great. Good luck and party on.