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James Loudspeaker® 21" Subterranean Subwoofer-211ST4-211ST4

Model #: 211ST4
James Loudspeaker
At a Glance

James Loudspeaker® 21" Subterranean Subwoofer with 18-120Hz +/-3dB frequency response and aircraft marine grade aluminum

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Get to know this product.

The 211ST 21” subterranean subwoofer was developed for high SPL bass output outdoor applications. In features a powerful 21” transducer for maximum excursion and SPL.There is no 70V version though it can be used as a 70V sub by being driven by an M1000 subwoofer amp which produces 70V output. No 70V transformers are used in the 211ST even for 70V application. All applications should be bi-amped.

James’ Landscape Speakers have mastered the mix of excellence in design, technology and superior sound... outdoor entertainment has never been so complete. The 70 volt system allows for runs up to a 1/4 mile without signal loss. Speakers placed in countless hidden positions can be aimed and sound suddenly snaps into focus: by the pool, next to guests mingling by the bbq or surrounding the tennis courts.

All Specifications are subject to change. An outdoor performance so discrete it is never found.


  • Frequency Response: 18-120Hz +/-3dB
  • Nominal Impedance: 4 ohms
  • Sensitivity: 91dB 2.83V/1m
  • Recommended Power Range: 500 - 1000W
  • Woofer: 21" (534mm) Aluminum
  • Enclosure: Aircraft Marine Grade Aluminum
  • Finishes : Black
  • Height: 24 in (609.60 mm)
  • Width: 24 in (609.60 mm)
  • Depth: 24 in (609.60 mm)
  • Net Weight: 220 lbs (99.79 kg)
  • Amplifier: M1000


Woofer Composition:Aluminum Cone


Sold As:Each


Speaker Type:Subwoofer Speaker

Misc. Specs

Product Weight220.0000
Depth (in.)24
Width (in.)24
Height (in.)24
Woofer Size21"
Maximum Power Handling (Watts)1000W
Speaker Size21
Rms Power Handling1000W
Subwoofer Size21
WarningProposition 65 Warning for California Residents