James Loudspeaker ST15-4 - Passive 15" Subwoofer 4 Ohm
James Loudspeaker ST15-4 - Passive 15" Subwoofer 4 Ohm is backordered and will ship as soon as it is back in stock.
Shipping Availability*
Shipping Availability*
Free Ground Shipping on Most Orders Over $250.00
Looking for the best price or expert advice? Give us a call at 1-888-230-3661 or use the Live Chat below. Buying 1 or 100, you may qualify for greater savings beyond the advertised price.
James Loudspeaker ST15-4 - Passive 15" Subwoofer 4 Ohm
Product Overview
The James Loudspeaker ST15 4 Ohm is a passive 15" subwoofer wired for 4-ohm operation, built for commercial AV installations that demand the deepest low-frequency reinforcement on low-impedance amplifier channels. Its 15-inch driver delivers powerful bass for large theaters, auditoriums, and high-end residential spaces, making this 4-ohm passive subwoofer the top of the ST range. As a passive sub, it runs from an external subwoofer amplifier. The ST15 4 Ohm suits integrators specifying maximum-output low-impedance bass.
Product Description
The ST15-4 is part of the James Loudspeaker ST subwoofer family, where the suffix indicates electrical configuration. The 15 indicates a 15-inch driver and the -4 indicates 4-ohm wiring suited to standard low-impedance amplifier outputs. Because it is passive, the ST15-4 requires an external subwoofer amplifier, leaving power and signal processing under the integrator's control. It is the impedance counterpart to the 70V ST15-70, which shares the same 15-inch driver but is wired for constant-voltage distribution, and it is the largest driver in the ST range, stepping up in displacement from the ST12-4. The full lineup is available in the James Loudspeaker collection. This makes the ST15-4 a practical specification for maximum-output low-impedance subwoofer systems.
Key Features
- 15-Inch Driver — A single 15-inch woofer delivers the highest output in the ST range.
- 4-Ohm Configuration — Wired for 4-ohm operation to match low-impedance amplifier channels.
- Passive Operation — Driven by an external 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
- Maximum-output low-frequency systems
- Large commercial theaters and auditoriums
- Multi-zone audio installations
- High-end residential and hospitality spaces
Technical Specifications
| Type | Passive Subwoofer |
| Driver Size | 15" |
| Distribution | 4-Ohm |
| Operation | Passive (requires external amplifier) |
Frequently Asked Questions
Does the ST15-4 need an amplifier?
Yes. It is a passive subwoofer and requires an external subwoofer amplifier.
What impedance is it?
It is wired for 4-ohm operation to match low-impedance amplifier channels.
What is the driver size?
The ST15-4 uses a single 15-inch driver.
How does it differ from the ST15-70?
The ST15-70 is the 70V version of the same 15-inch driver, wired for constant-voltage distribution instead of 4-ohm.
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.
Nationwide Audiovisual Services, Design, Installation & Support
Creation Networks is a trusted nationwide partner for complete audiovisual solutions — delivering expert AV system sales, professional design, programming, installation, and ongoing support to organizations across the United States.
From Microsoft Teams Rooms and enterprise video conferencing to LED video walls, live streaming production, and hybrid collaboration systems, we provide end-to-end AV integration using premium, certified technology from industry leaders including Crestron, Q-SYS, Shure, Extron, and Absen.
Whether you operate a single location or manage facilities nationwide, Creation Networks ensures your AV systems are designed for reliability, scalability, security, and long-term performance — helping your organization communicate more effectively and operate at peak efficiency.
CREATION NETWORKS — A PARTNER YOU CAN TRUST SINCE 2006
