The SA series was designed to be an excellent sounding subwoofer that is equally at home sealed or ported. We feel that the SA series is one of the best woofers available in it's price category and will satisfy the needs of a wide variety of users ranging from bass-heads to audiophiles! The SA series is also gaining popularity in SPL competitions due to their excellent voice coil cooling and rugged, durable constructions with several customers achieving output well over 150 dB! SA-15 D2 Classic
Sundown Audio 15" 750W Dual 2-Ohm SA Series Subwoofer

FEATURES:

RE (ohms): 4.61
FS (Hz): 34.88
Vas (L): 54.69
Qes: 0.72
Qms: 6.52
Qts: 0.65
Le (mH): 3.39
BL (NA): 21.76
Mms (Grams): 338
Cms (uM/N): 61.42
Sens (1w/1m): 86.81
Cutout Diameter: 14 1/8"
Mounting Depth: 7 1/2"
Overall Diameter w/ Gasket: 15 5/8"
Displacement: 0.17ft^3
RMS: 750 Watts
19.0mm X‐Max by 70% BL method one‐way (38.0mm peak to peak)
Thick black anodized aluminum voice coil formers for maximum strength and heat dissipation
4‐layer copper high temperature voice coil windings with 45mm winding length
Double layer permanently bonded high strength Nomex spider pack for maximum longevity and durability
Thick flat tinsel lead wires tied down to the spider to prevent lead noise and breakage
Custom tooled triple joint support ring
Custom tooled frame spacer / ventilation ring
High efficiency air‐flow management integrated into the motor for maximum voice coil cooling
Dual Aluminum Faraday rings for reduced inductance and inductive distortion (pole cap and magnet ID)
Two‐Year Warranty against defects in materials and workmanship

Box Recommendations::

SPECIFICATIONS:

DC Resistance (Re) Ω 7.75
Resonance Frequency (Fs) Hz 36.95
Equivalent Volume (Vas) L 52.35
Electrical Q Factor (Qes)
0.85
Mechanical Q Factor (Qms)
6.63
Total Q Factor (Qts)
0.75
Voice Coil Inductance (Le) mH 4.98
Force Factor (BL) NA 25.87
Moving Mass (incl. Air Load) (Mms) g 315
Suspension Compliance (Cms) mm/N 58.8
Sensitivity 1w / 1m 86.68 dB
Sealed Enclosure Suggestion cu. ft. 2.5
Ported Enclosure Suggestion cu. ft. 3 - 4 @ 35Hz
Displacement cu. ft. 0.17
Depth in 7.5
Outside Diameter in 15.625
Cutout in 14.125