Good P.A. system for solo and begginers. I own Behriinger equipment a few mix boards and speakers, they are good for the price the Harbinger APS15 15" Powered PA Speakers are decent speakers with an output of 200w max and a 3 channel with Eq. Both units are decent starter but not really compatible for a small band needing quality sound. When retailers sell this equipment usually is a mix special of amps and speakers, that dont produce the right formula of input and output wattage as I call in it simple terms. What you should know is how much output wattage you want to output in your band considering your budget. Did you try the "INs and OUT Theory" ?, or basic mixing theory., Check your output from main mixer to unbalance input in speakers make shure that you connect them right "Balance or Unbalance", try keeping your powered speakers EQ at neutral levels since your mixing down from the main mixer Yes you may be able to EQ your mids, bass and treble to a point.., but you would need to bring down the level of sound output of mixerl so your powered PA speakers handle the audio output without clipping, remember your powererd PA speakers can only handle 200w max. Guitar and bass and drums will easy over power a 200w output audio sound you will have to play soft songs acoustically, just think quality sound equal a bit more money to invest!!

Proper level setting of the mixer is important. HOWEVER if the clipping is occuring at the speakers the only possible problem MIGHT be that you have a supersonic feedback that is saturating the speakers above your hearing range, Be sure you don't boost the highs too much with the EQ as this can cause the feedback that you can't hear. Also make sure that you power the speakers from the SAME receptacle as the mixer, even if it means running an extension cord to bring power to the mixer. This is to avoid a low frequency hum and common mode distortion/damage. A low frequency hum could cause the clipping.
It would be a good idea to get a sound meter to check the sound level. You should be able to reach 85 Db from this system without clipping. If you need more than that, you MAY need more speakers if the band instruments are too loud. Also if the band has amps that get into the vocal microphones that adds to the clipping level... make sure the mics don't "hear" the band instruments. Make sure your speakers are toward the audience from the mics to avoid the supersonic feedback problem. If the vocalists can't hear themselves with that configuration you need to set up seperate stage monitors.

There are some pretty good videos on YouTube about proper mixer level setup.