it's funny when i hear something like:

"well i tried them at home and they sounded great i pumped the SO LOUD, and man these things kick @ss"

well, so do my 8" studio $1,000 Adam speakers.
but would i take them on a gig? hell NO
i know for a fact that they would crap out also

what people fail to understand is that speakers sound great at home for a reason, it's a small space

now when you're at a gig, you're in an open space, and now guess what?
you need to push them more to project sound,
the sound now is no longer contained in a small area, your bedroom

and this is why small, cheap speakers will crap out, it will happen 9 times out of ten if not all the time

it's not rocket science, just common sense...

Dom, no offense
do yourself a big favor, save up and sell those 8" and sell your Logitech, or keep them at home where they are meant to be and were designed for.