Hi dead-serious,
Sorry for my english :-) i will try to help you.
Here is some links to rent music equipment in Paris:
Good shop for rental (this one exist since long time)
AVLS:
www.avls.fr
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This one also exist since long time in Paris:
location.planetsono.com
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Here's another one:
www.locasono.fr (i don't know this one but seems good)
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What kinds of speakers do you use ? Maybe i can try to help you choose.
So in advance, welcome in Paris :-)