GSB12 – Coming Soon


In-Ground Landscape Subwoofer

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 35 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 the RedDot international design award 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, 28mm (1.5”) voice coil on Kapton former
  • True subwoofer performance down to 35 Hz
  • 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: 867 mm Height x 400 mm Diameter (34.2 x 15.8 in)
  • UL 1480A listed




Frequency Range (-10dB) 30 Hz – 120 Hz
Frequency Response (+/-3 dB) 39 Hz – 107 Hz
Power Rating 800 W Continuous Program (2 hrs)
400 W (1600 W Peak), Continuous Pink Noise (2 hrs)
300 W (1200 W Peak), Continuous Pink Noise (100 hrs)
Sensitivity 85 dB (ave. 40 Hz – 105 Hz)
Maximum SPL 117 dB peak (111 dB continuous, 2 hr) @ 1m
Nominal Coverage 360° horizontal, 160° vertical (primary listening 10° to 50° up from ground)
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 Hunter Green (RAL 6018) or Tan (RAL7004)
Dimensions 867 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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