JBL JBL-GSB8-TN 8" In-Ground Subwoofer, Tan, 1 pc B-Stock
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- SKU
- JBL-GSB8-TN-B
Description
JBL JBL-GSB8-TN 8" In-Ground Subwoofer, Tan
The JBL GSB8-TN is a professional-grade in-ground subwoofer engineered for outdoor studio monitoring and landscape audio installations where seamless integration and accurate low-end extension matter. Its compact footprint and weatherproof composite construction blend into outdoor monitoring environments while delivering visceral bass response that anchors full-range systems. This is purpose-built hardware for producers and system engineers who need legitimate subwoofer performance for monitoring and mixing applications in ground-based installations.
Audio Performance & Coverage
This subwoofer reaches down to 35 Hz with a steep, multiple-slope lowpass filter, delivering true subwoofer extension for accurate bass monitoring rather than consumer-grade midrange boosting. With 114 dB peak SPL (108 dB continuous) and 84 dB sensitivity across its operating band, the unit produces authoritative output from a compact 8-inch driver while maintaining headroom for dynamic material during tracking and mixing. The 360° horizontal and 160° vertical coverage pattern ensures consistent bass response across monitoring positions in outdoor and semi-outdoor studio spaces.
Installation & Build Quality
The IP66-rated LDPE polyethylene enclosure with 6 mm walls and weatherproof port cap withstands ground burial and prolonged moisture exposure without degradation, making it ideal for permanent outdoor studio installations. Installation requires an approximately 18.3" diameter by 24.8" deep hole, and the unit ships with a 40" input harness for flexible connectivity to amplifier locations distant from the monitoring position. Flexible power options—250W RMS (1000W peak) with 6-ohm, 70V, or 100V operation—accommodate both low-impedance direct runs and distributed voltage systems common in installed studio monitoring setups.
Key Features
- 8-inch polypropylene injection cone driver with thermoplastic vulcanizate surround
- 50 mm voice coil on glass fiber former
- Frequency extension down to 35 Hz with steep lowpass filter
- 84 dB sensitivity (average 43 Hz – 110 Hz)
- 114 dB peak SPL (108 dB continuous @ 1m)
- 250W RMS / 1000W peak power handling
- 6-ohm, 70V, and 100V operation with 100-watt transformer for distributed systems
- 360° horizontal and 160° vertical coverage pattern
- IP66-rated composite bandpass enclosure with 6 mm polyethylene walls
- Height 768 mm (30.1"), diameter 311 mm (12.2")
- Neutral beige-grey finish (RAL 7006) for minimal visual impact
- 40" input harness included
The GSB8-TN combines legitimate subwoofer performance with outdoor-rated construction and flexible system integration, making it a solid choice for professional outdoor monitoring installations and landscape audio applications.
More Information
| Condition | Refurbished |
|---|---|
| Country of Manufacture | China |
Reviews
About this B-Stock unit
| Condition | Factory B-Stock direct from the manufacturer: open box, show or demo unit, or a minor cosmetic blemish. Fully tested. |
|---|---|
| Warranty | FULL manufacturer warranty, the same as a new unit |
| Ships from | The manufacturer's US warehouse, about 2 business days handling, tracking emailed when it leaves |
| Price vs new | $106 under the new unit ($530) |
Prefer a brand-new one? JBL JBL-GSB8-TN 8" In-Ground Subwoofer, Tan, 1 pc is in the catalog at $530.
At a Glance
The JBL GSB8-TN is a professional-grade in-ground subwoofer designed for outdoor installations where deep, controlled low-end extension and system reliability matter. Home studios and small recording spaces will find limited use for it, as it is purpose-built for landscape and distributed audio systems rather than indoor mixing rooms. If your project involves outdoor event recording, environmental audio capture, or architectural soundscaping, this unit's weatherproof construction and 35 Hz reach provide legitimate subwoofer performance in a buried, low-profile form factor.
Who This Is For
| Best suited for | landscape audio installations, architectural audio systems, outdoor events, distributed audio systems |
|---|---|
| Tonal character | Tight low end, authoritative output, visceral bass extension, controlled spl |
| Less specialized for | indoor studios, portable applications, budget installations (it will do it; instruments voiced for that style do it more easily) |
| Skill level | Professional |
Frequently Asked Questions
What does B-Stock mean for this subwoofer?
B-Stock means the JBL GSB8-TN is fully functional and meets all performance specifications, but may have minor cosmetic imperfections from handling or display. The unit is otherwise identical to new stock and carries the same audio performance.
How deep does it reach, and is it a true subwoofer?
Yes—this is a legitimate subwoofer that extends down to 35 Hz with a steep multiple-slope lowpass filter, not a consumer-grade midrange booster. It delivers 84 dB sensitivity and peaks at 114 dB SPL, providing authoritative bass extension for full-range outdoor systems.
What size hole does it need, and how is it installed?
Installation requires an approximately 18.3-inch diameter by 24.8-inch deep hole. The IP66-rated polyethylene enclosure is buried directly in the ground, and a 40-inch input harness ships included for flexible runs to a distant amplifier location.
Can I use it with both low-impedance and distributed voltage systems?
Yes. The GSB8-TN supports 6-ohm, 70V, and 100V operation with a 100-watt transformer included for distributed systems, making it compatible with direct amplifier runs and landscape audio voltage systems.
Will this survive outdoor weather and ground burial?
Yes. The IP66-rated LDPE polyethylene enclosure with 6 mm walls and weatherproof port cap is engineered to withstand direct ground burial and prolonged moisture exposure without degradation.
Do I pay sales tax on this order?
Sales tax is collected only on orders shipped to California; orders shipped to any other US state are not charged sales tax at checkout when you buy direct from our website. Marketplaces collect sales tax as the facilitator in most states, so the same listed price can cost more there. Buyers remain responsible for any use tax their state applies. Free US shipping and 30-day returns are included.
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