I have four of these - just made them. Single 4 Ohm coil, 500 watts power handling, 10mm Xmax.
Specs:
Fs = 21.8 Hz
Re = 3.2 ohms[dc]
Qt = 0.43
Qes = 0.46
Qms = 6.01
Mms = 285.9 grams
Rms = 6.54 kg/s
Cms = 0.000185 m/N
Vas = 274.9 liters
Sd= 1029.2 cm^2
Bl = 16.5 Tm
Lp(2.83V/1m) = 93.90 dB
$75 each plus shipping.
Specs:
Fs = 21.8 Hz
Re = 3.2 ohms[dc]
Qt = 0.43
Qes = 0.46
Qms = 6.01
Mms = 285.9 grams
Rms = 6.54 kg/s
Cms = 0.000185 m/N
Vas = 274.9 liters
Sd= 1029.2 cm^2
Bl = 16.5 Tm
Lp(2.83V/1m) = 93.90 dB
$75 each plus shipping.