James Loudspeaker ST15-70 - Passive 15" Subwoofer 70V
James Loudspeaker ST15-70 - Passive 15" Subwoofer 70V is backordered and will ship as soon as it is back in stock.
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James Loudspeaker ST15-70 - Passive 15" Subwoofer 70V
Product Overview
The James Loudspeaker ST15 70V is a passive 15" subwoofer wired for 70V operation, built for commercial AV installations that distribute the deepest low-frequency reinforcement across long cable runs and multiple zones. Its 15-inch driver delivers powerful bass on constant-voltage amplifier lines, making this 70V passive subwoofer the top of the distributed ST range for large theaters and venues. As a passive sub, it runs from an external 70V subwoofer amplifier. The ST15 70V suits integrators specifying maximum-output constant-voltage bass.
Product Description
The ST15-70 is part of the James Loudspeaker ST subwoofer family, where the suffix indicates electrical configuration. The 15 indicates a 15-inch driver and the -70 indicates 70V constant-voltage wiring suited to distributed amplifier lines with long cable runs. Because it is passive, the ST15-70 requires an external 70V subwoofer amplifier, leaving power and signal processing under the integrator's control. It is the distribution counterpart to the 4-ohm ST15-4, which shares the same 15-inch driver but is wired for low-impedance operation, and it is the largest driver in the ST range, stepping up in displacement from the ST12-70. The full lineup is available in the James Loudspeaker collection. This makes the ST15-70 a practical specification for maximum-output constant-voltage subwoofer systems.
Key Features
- 15-Inch Driver — A single 15-inch woofer delivers the highest output in the ST range.
- 70V Configuration — Wired for 70V constant-voltage operation to suit distributed amplifier lines.
- Passive Operation — Driven by an external 70V subwoofer amplifier for full integrator control.
- ST Family Compatibility — Matches other ST subwoofers for consistent multi-zone specification.
- Large-Room Output — Sized for large theaters and auditoriums needing deep bass.
Typical Applications
- Distributed 70V low-frequency systems
- Large commercial theaters and auditoriums
- Multi-zone audio installations with long cable runs
- High-end residential and hospitality spaces
Technical Specifications
| Type | Passive Subwoofer |
| Driver Size | 15" |
| Distribution | 70V |
| Operation | Passive (requires external amplifier) |
Frequently Asked Questions
Does the ST15-70 need an amplifier?
Yes. It is a passive subwoofer and requires an external 70V subwoofer amplifier.
What distribution is it wired for?
It is wired for 70V constant-voltage operation, suited to distributed amplifier lines.
What is the driver size?
The ST15-70 uses a single 15-inch driver.
How does it differ from the ST15-4?
The ST15-4 is the 4-ohm version of the same 15-inch driver, wired for low-impedance operation instead of 70V.
Is it the largest ST subwoofer?
Yes. The 15-inch driver gives it the greatest displacement in the ST range.
At Creartion Networks, we do everything we can to create an excellent customer experience. This includes fast shipping and easy returns.
- Most in-stock orders placed Monday-Friday ship within 24-48 hours. General restrictions apply; please see our full shipping policy here.
- We offer a 30-day return policy from the delivery date on many products. Product restrictions apply. Restocking fees for the return of open-box items. Please see our full return policy here for more information.
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