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Manufacturer response and impedance chart for the small Dayton woofer. Not very efficient at 83 or so dB/Watt, but I will just have to live with that. It will get even worse with baffle step correction. Maybe something like 80 db/1 watt with crossover. Max sound pressure will be something like 93-95 dB with this before the little coils start smoking.
This driver is marketed as a full range, but it will roll off heavily in the high frequency off axis, so personally I would not attempt that configuration. I might try to show that in a measurement. (would be great though if manufacturers could agree on a dB range and format to show their measurements in)
Besides that, it's got a nice flat response, which is great.