In-Ground Landscape Subwoofer

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In-Ground Landscape Subwoofer
The JBL GSB12 in-ground 12-inch landscape subwoofer augments the low-frequency performance of JBL GSF full-range landscape speakers to provide rich, full-range sound in lawn and garden areas of hospitality, corporate and retail spaces.

The GSB12 focuses on fidelity, with true subwoofer extension down to 30 Hz and a steep, multiple-slope lowpass filter for superior sound. Its premium-grade, 200-watt subwoofer-band transformer allows use in 70V/100V systems or can be connected for low-impedance direct operation.

This sleek, ultra-low-profile speaker—winner of international design awards for industrial design excellence—installs underground, with only the audio port visible. It’s designed to withstand the elements: Its chamber is oriented directly below the audio port to prevent accidental damage from landscaping, which can be a problem with side-located chambers. Grab handles allow easy installation and tabs secure the subwoofer to blocks or anchors.

Add the GSB12 to landscape areas of hotels, shopping complexes, restaurants, public spaces, theme parks or any application that demands legendary JBL sound with deep, rich, powerful bass.


  • Transducer: GSB12: 305 mm (12”) polypropylene driver, 50mm (1.5”) voice coil on Kapton former
  • True subwoofer performance down to 30Hz
  • Built-in steep, multiple-slope lowpass filter
  • Low-impedance direct operation, plus premium-grade subwoofer-band transformer for use in 70V/100V systems
  • Forms a complete system with JBL GSF full-range landscape speakers
  • Chamber oriented directly below opening to prevent accidental damage from landscaping
  • Grab handles allow easy installation
  • Anchor points for securing cabinet to block or anchors
  • Available in hunter green or tan finishes to fit a wide variety of landscapes
  • Dimensions: 866 mm Height x 402 mm Diameter (34 x 16 in)


  Version Language Size Uploaded
file type icon Control Contractor Brochure (2023)
en version B, updated: Jun 2023
en  8.18 MB Jun 2023
CAD Drawings
file type icon GSB12 2D and 3D Drawings
en version A, updated: Aug 2023
en  0 Bytes Aug 2023
Install Guides
file type icon GSB8 & GSB12 Installation Guide
en version A, updated: Feb 2023
en  611 KB Feb 2023
Speaker Tunings
file type icon Commercial, CBT, and AWC Tunings 220616
version A, updated: May 2023
  557 KB May 2023
Spec Sheets
file type icon GSB12 Spec Sheet
en updated: Jul 2023
  en  557 KB Jul 2023
Declaration Of Conformity
file type icon GSB Series Declaration of Conformity
en updated: Jul 2023
  en  124 KB Jul 2023

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Parts & Service


Frequency Range (-10dB) 30 Hz – 120 Hz
Frequency Response (+/-3 dB) 39 Hz – 107 Hz
Power Rating 900 W Continuous Program (2 hrs)
450 W (1800 W Peak), Continuous Pink Noise (2 hrs)
300 W (1200 W Peak), Continuous Pink Noise (100 hrs)
Sensitivity 85.5 dB (ave. 40 Hz – 105 Hz)
Maximum SPL 118 dB peak (111 dB continuous, 2 hr) @ 1m
Coverage Pattern Omnidirectional
Nominal Impedance 6Ω (at 6Ω tap)
Transformer Taps 70V: 200 W, 100 W, 50 W
100V: 200 W, 100 W
Driver 305 mm (12-inch) driver, polypropylene injection cone, thermoplastic vulcanizate surround, 50 mm (2-inch voice coil on glass fiber former
Terminals Bare wire with dielectric-gel-filled wire nuts (1 meter single jacked cable 7 wires with 14 AWG)
Enclosure Material LDPE Polyethylene plastic, 6 mm minimum wall thickness, color throughout
Color Pine Green RAL 6028, or Beige Grey RAL 7006
Dimensions 842 mm Height x 400 mm Diameter (34.2 x 15.8 in)
Net Weight 16.2 kg (35.7 lbs)
Included Accessories (7) wire nuts



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