The JBL GSB8-TN in-ground subwoofer is a premium 8-inch landscape audio solution designed to enhance outdoor sound systems with deep, accurate low-frequency performance. Engineered to complement JBL GSF full-range landscape…
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The JBL GSB8-TN in-ground subwoofer is a premium 8-inch landscape audio solution designed to enhance outdoor sound systems with deep, accurate low-frequency performance. Engineered to complement JBL GSF full-range landscape speakers, the GSB8-TN adds powerful bass presence to create a full, rich sound experience across lawns, gardens, and outdoor entertainment areas.
Delivering true subwoofer extension down to 35 Hz, the GSB8-TN incorporates a steep, multiple-slope lowpass filter for accurate and musical bass reproduction. Its integrated, premium-grade 100-watt subwoofer-band transformer makes it versatile for both 70V/100V distributed audio systems as well as low-impedance direct operation. This flexibility ensures compatibility with a wide range of professional outdoor audio installations.
The GSB8-TN is designed with both performance and aesthetics in mind. Its sleek, award-winning industrial design allows the subwoofer to blend seamlessly into landscapes, with only the low-profile audio port visible above ground. The chamber is oriented directly beneath the port, preventing accidental damage from landscaping tools and ensuring long-term reliability. For added convenience, built-in grab handles simplify installation, while anchoring tabs allow secure placement into soil, blocks, or anchors.
Built to endure outdoor environments, the enclosure is constructed from durable, weather-resistant LDPE polyethylene with a 6 mm wall thickness. Available in hunter green or tan finishes, the GSB8-TN integrates naturally into a wide variety of outdoor settings. From hotels and restaurants to retail centers, public spaces, and theme parks, this landscape subwoofer delivers legendary JBL performance with robust, immersive bass.
Features
8″ polypropylene driver with 2″ voice coil on glass fiber former
True subwoofer performance with extension down to 35 Hz
Built-in steep, multiple-slope lowpass filter
Operates in low-impedance mode or via 70V/100V systems with transformer
Complements JBL GSF full-range landscape speakers
Chamber oriented directly below port for durability
Grab handles for easier installation
Anchor points for secure placement
Weather-resistant LDPE polyethylene construction
Available in hunter green or tan finishes
Specifications Table
| Specification | Details |
|---|---|
| Frequency Range (-10 dB) | 35 Hz 130 Hz |
| Frequency Response (3 dB) | 43 Hz 120 Hz |
| Power Rating | 500W Continuous Program (2 hrs), 250W Continuous Pink Noise (2 hrs), 150W Continuous Pink Noise (100 hrs) |
| Peak Power | 1000W (2 hrs), 600W (100 hrs) |
| Sensitivity | 84 dB (43 Hz 110 Hz avg.) |
| Maximum SPL | 114 dB peak, 108 dB continuous @ 1m |
| Coverage Pattern | Omnidirectional |
| Nominal Impedance | 6 |
| Transformer Taps | 70V: 100W, 50W, 25W / 100V: 100W, 50W |
| Driver | 209 mm (8) polypropylene cone, thermoplastic vulcanizate surround, 50 mm (2) voice coil |
| Terminals | Bare wire with gel-filled wire nuts, 1m cable (7 wires, 14 AWG) |
| Enclosure Material | LDPE polyethylene, 6 mm wall |
| Color Options | Hunter Green (RAL 6028) or Tan (RAL 7006) |
| Dimensions | 768 mm height x 311 mm diameter (30.1 x 12.2) |
| Net Weight | 9.3 kg (20.5 lbs) |
| Accessories Included | 7 gel-filled wire nuts |
Compare Table
| Model | Type | Frequency Range | Power Handling | Transformer | Best For |
|---|---|---|---|---|---|
| JBL GSB8-TN | 8″ In-Ground Subwoofer | 35 Hz 130 Hz | 500W Continuous Program | Yes (70V/100V) | Outdoor hospitality, retail, gardens |
| JBL GSF Series | Full-Range Landscape Speaker | 60 Hz 20 kHz (varies) | Varies by model | Yes (70V/100V) | Outdoor full-range coverage |
We offer fast and reliable shipping worldwide. All orders are carefully packaged and shipped within 1–3 business days after payment confirmation.
Standard shipping, expedited shipping and express delivery options are available at checkout. Delivery time depends on your destination country and local logistics.
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