16 ohm version of the first 4.5" speaker with patented XBL^2 motor technology and truncated for closer driver spacing.Parameters are Fs: 65 Hz, Qms: 3.98, Qes: 0.77, Qts: 0.65, Vas: 5.8L, Sd: 57 cm^2, Xmax: 6mm one way, Re: 14.1 Ohms, Le: 0.65 mH, BL:5.7 N/A, Mms: 4.5 grams, SPL: 85.8 dB @ 1W, 1m.
Spec sheet (pdf)