For Light Weight PA....I have this:
http://www.zzounds.com/item--ELVZX190

I first got 2, I like them so much, only 18 lbs each, that I got a second pair...

For powered mixer I use: http://www.yamaha.com/yamahavgn/CDA/ContentDetail/ModelSeriesDetailPF/0,,CNTID%25253D38160%252526CTID%25253D227800,00.html

Only 22 lbs.... Incredible sound for a light weight and no compromising sound quality. ;o)
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mdorantes