Try it and see. That mixer is 500 marketing watts. Real watts are substantially less, but many people seem happy with it. Those speakers claim to be very efficient, so you should get quite a bit of sound out of them with that mixer, although a 2 x 15" speaker isn't a very good choice for vocals only.it will just be vocal.
What will be the best cheap solution to get it working at full power?
That's a pretty common misconception.Will do! Thanks for the advice, i just remember reading somewhere (probably gearslutz) that running things at a lower wattage can damage the system and thought it would be best to double check!
out of curiosity, what sized power amp would be designed for these to run efficiently?
Underpowering speakers is ********. Driving an amp to clipping, which is not the same thing at all can cause damage. In that case, you're under-amped. The power handling ability of your speakers is an unrelated issue. In fact, if you do drive your too small amp to clip, the higher the power handling ability of your speakers, the better off you'd be.Your first sentence is the reason your second sentences happens. So I wouldn't call it ********.