You do not need the poles. you don't need to plug them in the wall. you don't use them in a concert hall. They are a very useful tool for smaller jobs and for that they are great.
MEL
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KORG PA1000, KORG PA900, 2 BOSE S1 PROS, 2 BOSE L1 COMPACTS, YAMAHA STAGEPAS 500, ROLAND VP7