Have you ever tried this type of speakers as a mini PA?

http://www.amazon.com/dp/B01BY7Z0SE/ref=...334505&sr=1

or

http://www.amazon.com/Sony-GTKXB7BC-Powe...ds=sony+gtk+xb7

These models are brand-new, so there are only few reviews. I think these "oversized private party ghettoblasters" often lack sound quality especially in the mid frequencies, but maybe these new Sony speakers might be an exception?
The weight is 10-12 kilograms.