Car Subwoofers


12-inch single voice coil 4 ohm subwoofer

12" woofer
30.48cm woofer



Available Finishes:
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Incredible Sound, Affordable Price

All the Polk features, all the Polk technology that makes our subs create big, tight, musical bass are here. The db1240 is ready for you when you’re ready to get serious about your music.

db1240 Features:

Polypropylene cone with rigid ABS dustcap to stiffen the cone for greater mechanical stability and lower distortion.

Marine Certified Polk db Series speakers are built tough to withstand the toughest environments so they are perfect for use in boats of all types. 

Santoprene surround is impervious to extremes in temperature, humidity and exposure to sunlight for excellent long term reliability.

Fire-retardant flat NOMEX® spider allows extended linear motion while providing highly reliable mechanical and thermal stability.

Double venting of the 4-layer Kapton voice coil former, cone/coil coupler and pole piece contribute to the high power handling and reliability of the db Series subs.

As with all Polk subwoofers, the voice coil alignment, motor and suspension were optimized using a state-of-the-art Klippel laser analyzer. The result is superior cone travel linearity for flatter response and lower distortion.

Dual voice coil version also available - db1240DVC

Optional db12G grille is available.

All Polk products are made using the best materials and the most advanced manufacturing techniques. They pass the industry’s most exhaustive quality tests, including drop testing, extreme signal response and UV & salt exposure testing. Polk loudspeakers are built to perform for a lifetime.

Driver Complement

Diameter12" (30.48cm) 
TypeDynamic Balance woofer with polymer composite cone 


Total Frequency Response27-200 Hz 
Nominal Impedance4 ohms
Efficiency88 dB
Power Handling
Continuous360 watts
Peak720 watts
Voice Coil
Driver Diameter2" (5.08cm) 

Thiele / Small Parameters

Resonant Frequency28.3 Hz
Xmax Linear.62 inch/16 mm (peak to peak) 
Recommended EnclosureSealed/Ported/Bandpass 
SD80.6 sq in/520 sq cm 
VAS2.87 cubic ft/81.4 L 


Cut-Out Diameter11 1/16" (28.10cm) 
Height2 1/8" (5.40cm) 
Driver Mounting Depth
Top Mount6 1/16" (15.40cm) 
Bottom Mount6 9/16" (16.67cm) 


Unit of Measureeach 


Speaker Warranty1 year parts and labor (original purchaser) 

Specifications, dimensions and features subject to change without notice. For more information call us at 1-800-377-7655 (USA and Canada). Outside of North America call +1 (410) 358-3600.

db1240 Media

db1240 Accessories