A Classic Jensen Speaker with AlNiCo magnet, found in original Fender '53 Bandmaster & Bassman.

Bell Cover (shown) must be ordered separately
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General Characteristics
Nominal Overall Diameter	385 mm	15 in
Nominal Voice Coil Diameter	38 mm	1.5 in
Magnet Weight	826 g	29.1 oz
Flux Density	1.26 T
Thiele-Small Parameters
Voice Coil DC Resistance	RE	6.5 Ω
Resonance Frequency	ƒS	77.0 Hz
Mechanical Q Factor	QMS	9.63
Electrical Q Factor	QES	1.36
Total Q Factor	QTS	1.18
Mechanical Moving Mass	MMS	42.0 g
Mechanical Compliance	CMS	103.0 µm/N
Force Factor	BxL	10.14 Wb/m
Equivalent Acoustic Volume	VAS	82.1 lt.
Maximum Linear Displacement	XMAX	1.0 mm
Reference Efficiency	nO	2.62 %
Diaphragm Area	SD	754.7cm2
Losses Electrical Resistance	RES	50.0 Ω
Voice Coil Inductance @ 1kHz	LE	0.90 mH
Constructive Characteristics
Magnet	AlNiCo
Voice Coil Winding	Copper
Voice Coil Former	Kapton
Cone	Paper
Surround	Integrated Paper
Dust Dome	Solid Paper
Basket	Pressed Sheet Steel