System for house parties

I use my 2 EV's and a sub for house parties, or dust off the Bose L1 for very small house parties. Or we have used 2 K10's and a kSub. I suggest if you have a QSC rig the 2 tops aren't going to be too much.

Look for a pair of old Peavey SP series....They rock (for house parties) and are as tough as sh1t

For a House Party I would use a Bose L1 in a heartbeat. Believe it or not but I have used my Bose AWM and it worked quite well. If its for a younger crowd, then you will need something stronger as mentioned by others above.

If you are looking at Peavey SP's I suggest Yamaha Clubs which are very similar to the SP's. Personally I think those are big, heavy and a pain to move around in a small space. I would go for something smaller & lighter like the EV Live-X 12's.

Definitely use an EQ as the acoustical environment varies wildly and be prepared to aim the speakers very precisely to tame slap-back. It can be somewhat opposite of a larger space and you may find that tilting speakers upwards and purposefully bouncing sound off the ceiling works pretty well when you can't get the speakers high enough in a conventional setup.

Don't get too crazy on subs as it's hard to get enough space for a the very low bass waves to propagate. You almost could use a home audio sub-woofer if you install some handles on it, but the reliability would be questionable. I used one for a few years and was very careful with it and people liked it.