Glossary of Terms

Q	The energy losses of relative damping (ratio of stored to dissipated
	energy or ratio of reactive to resistive energy).
Fs	Free air resonance of driver in Hz.
Qms Mechanical Q.
Vas	Volume of air equivalent to driver from the rest position.
Cms	Mechanical compliance of a loud speaker piston.
Mms	Moving mass of total loud speaker piston assembly.
Xmax The maximum linear excursion of a loud speaker.
Sd	Surface area of the cone.
Dia	The piston diameter of a loud speaker.
Qes	Electrical Q of a system.
Re	DC resistance.
Le	VC inductance.
Pe	Maximum input power.
Qts	Total Q of the system.
Sens Sensitivity. An efficiency measurement in dB’s.
Vc	Volume of a closed or sealed enclosure
Vb	Volume of a vented enclosure.
Fc	The resonant frequency of a closed or sealed system
Fb	The resonant frequency of a vented system
F3 The half-power (-3dB) frequency of a loud speaker enclosure
Qtc	The Q of a loud speaker at Fc in a closed box, considering both
	it’s electrical and mechanical resistance.
QL	The Q of a vented box, resulting from all box losses.
DV	Diameter of vent.
LV	Length of vent.
H	Height.
W	Width.
D	Depth

AT12D4, AT12D2, AT12S4 specifications

Maxxsonics is a renowned name in the world of car audio, and their AT series subwoofers, including the AT12S4, AT12D2, and AT12D4, set a solid benchmark in delivering exceptional sound quality and performance. These subwoofers are designed to satisfy diverse audio enthusiasts, particularly those seeking an immersive bass experience.

The AT12S4 is a single voice coil subwoofer with a 4-ohm impedance, catering to those who desire simplicity in setup. Its robust construction includes a durable polypropylene cone that guarantees longevity while providing reliable bass reproduction. The dual-stacked magnet system enhances the overall magnetic motor structure, allowing the AT12S4 to produce profound low frequencies without distortion. This model is particularly favored by users who value clarity in high-energy genres, as it delivers precise bass notes suitable for varied musical styles.

On the other hand, the AT12D2 and AT12D4 models are dual voice coil subwoofers designed for more advanced audio setups. The AT12D2 features a 2-ohm impedance per coil, making it ideal for those who aim for lower impedances to maximize power from their amplifiers. This design allows for flexibility in wiring configurations, encouraging users to achieve that perfect balance between sound quality and amplifier performance. The robust build quality, coupled with high-temperature voice coils, ensures reliable operation even under demanding conditions, making it great for competition setups.

Similarly, the AT12D4 with its 4-ohm voice coils further extends flexibility by providing various wiring options while maintaining an eye on impedance matching with different amplifiers. This feature can be particularly beneficial for users looking to optimize their systems based on the amplifiers they already possess. The sound produced is rich and thunderous, enhancing any driving experience with deep, resonating bass tones that can fill larger spaces.

Across all models, Maxxsonics incorporates advanced technologies like progressive spider design and durable rubber surrounds that enhance performance. These technologies not only boost reliability but also improve overall sound quality by minimizing distortions and unwanted resonance.

In conclusion, the Maxxsonics AT12S4, AT12D2, and AT12D4 subwoofers stand out for their impressive features and technological innovations. Whether for casual listening or competitive audio setups, these subwoofers deliver powerful bass and remarkable sound clarity, ensuring car audio enthusiasts find their desired sound profile. With their rugged designs and flexible configurations, they cater to a wide range of preferences and setups.