Model Number: US12D4
Size: 12 in.
RMS/MAX Power: 750W / 1500W
Recommended Power Range: 100 to 450 watts
Frequency Response: 28 Hz – 500 Hz
SPL at 1W / 1m: 93 dB
Mounting Depth: 6.6 in.
Voice Coil: 2.5 in. VC

Ultra Shock Subwoofers are engineered for performance and sound quality. New materials used for surround and spider, revised stronger baskets, and improved stronger/larger motor structures. Suspension: The surround is now a rugged Santoprene rubber surrounded that will support long linear excursions with improved reliability. The high flex life Conex spider/damper has been revised in roll shape and material to compliment the improved surround. Motor Structure: Magnet sizes and voice coil winding lengths have all been adjusted for improved performance output and sound quality. The motor structures were engineered using FEA analysis to provide low distortion output at both high and low power levels, which results in more linear motor force within the subwoofers normal operating excursion and power levels for both negative and positive current through the voice coil.

GENERAL	US12D4
Size	12"
Impedance (ohm)	Dual 4 ohm
Cone material	Kevlar Reinforced ultra stiff paper composite
Surround material	Butyl rubber
Voice coil	2.5” BAEISV
Ideal sealed box volume (cu ft / litre)	0.95 / 26.9
Ideal ported box volume (cu ft / litre)	1.34 / 37.95
Port diameter (inch / mm)	3 / 76.2
Port length (inch / mm)	6.25 / 158.8
Dual voice coil	Yes
Sensitivity (1W / 1mm)	93 dB
Frequency response	28 Hz – 500 Hz
RMS (watts)	750
Peak power handling (watts)	1500
Mounting depth (inch / mm)	6.6 / 168
Vas (cu ft / litre)	6 ohm: 1.687 / 47.78
Resonant frequency (Hz)	6 ohm: 30.477
QTS (Hz)	6 ohm: 0.384
Xmax (inch / mm)	6 ohm: 0.591 / 15.00

US12D4 | 12” 4 ohm Ultra Shock Car Audio Subwoofer 1500 watts

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