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@danb
Wattage ratings are pretty much meaningless.
What you want to be looking at is sensitivity. 109 dB/w/m is very high. At 1m 1watt will give you 109dB. That is pretty dammed loud.
I would just buy a cheap 20-30w class-t amp. They are very efficient and will easily run off batteries.
All depends how loud you actually need it to be...