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Polk db1240

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RRP: $189.00
Our Price: $179.00

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12-Inch Single Voice Coil 4 Ohm Subwoofer

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.


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. That's why Correct Craft offers Polk speakers in their award-winning Nautiques ski and wakeboarding boats.

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


Quantity: 1
Diameter: 12" (30.48cm)
Type: Dynamic Balance woofer with polymer composite cone


Total Frequency Response: 27-200 Hz
Nominal Impedance: 4 ohms
Efficiency: 88 dB

Power Handling

Continuous: 360 watts
Peak: 720 watts

Voice Coil

Driver Diameter: 2" (5.08cm)


Unit of Measure: each



Diameter: 11 1/16" (28.10cm)

Driver Mounting Depth

Top Mount: 6 1/16" (15.40cm)
Bottom Mount: 6 9/16" (16.67cm)


Height: 2 1/8" (5.40cm)

Thiele / Small Parameters

Resonant Frequency: 28.3 Hz


Xmax Linear: .62 inch/16 mm (peak to peak)
MMS: 146.7
BL: 14.5
CMS: 215.5
Recommended Enclosure: Sealed/Ported/Bandpass
SD: 80.6 sq in/520 sq cm
VAS: 2.87 cubic ft/81.4 L
QTS: .4
QES: .4
QMS: 11.7

Speaker Warranty 1 year

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