David,
I am surprised that the Jazzon speakers do not appear on their website.
Cube Audio Nenuphar Single Driver Speaker (10 inch) TQWT Enclosure
----------------------------------------
Parameters (from Cube Audio):
Power: 40 W
Efficiency: 92 dB
Frequency response: 30Hz - 18kHz ( 6db)*
Dimensions: 30 x 50 x 105 cm
Weight: 40 Kg