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James Loudspeaker ST Series ST21-4 21 Inch 4 ohm and 70V Subterranean Subwoofer

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Timonium - 410.308.1650
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The ST21-4, a 21" subterranean subwoofer was developed for high SPL bass output outdoor applications. It features a powerful 21" transducer for maximum excursion and SPL. The ST21-4 can be directly driven by an M1000 subwoofer amp which produces 70V of output, or 1000W+ at the 4ohm rating. However, at 1000W, wire loss needs to be considered and calculated as with any other 4 ohm wire run. In all applications, the ST21-4should be bi-amped.

Also, the ST21-4 is quite heavy. Four eyebolts are located on the top to allow the subwoofer to be lowered into the ground.

Specifications

Frequency Response

18-120Hz +/-3dB

Nominal Impedance

4 ohms

Sensitivity

91dB 2.83V/1m

Recommended Power Range

500 - 1000W

Recommended Amplifier

M1000

Woofer

(1) 21" (534mm) Aluminum

Enclosure

Aircraft Marine Grade Aluminum

Finishes

Black buried enclosure and black exposed port, custom finishes available for a nominal upcharge

Width

24 in (609.60 mm)

Depth

24 in (609.60 mm)

Height

24 in (609.60 mm)

PRODUCT INFORMATION:

Model: ST21-4 | Barcode:

WARNING: California Residents - Proposition 65. This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov

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