On the whole, I have a feeling the Nano's do a better job of being flat for a quiet gig than the SRM's. Not even a whole lot more expensive (a pair of SRM's will cost you about $500, plus stands), FAR better at the low end and top end.

Donny, if you still had the Nano's, would you still preferred to go out on the low volume gig with the SRM150's?
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An arranger is just a tool. What matters is what you build with it..!