JBL STAGE358F 5.25" 2-Way Coaxial Speakers

The JBL STAGE358F is a pair of 5-1/4-inch coaxial car speakers designed for vehicles with compatible 130 mm speaker locations. It combines a woofer and tweeter in each speaker, providing a straightforward full-range replacement or upgrade for factory-installed speakers. The set is supplied without grilles for installations that retain the vehicle’s original speaker grilles or trim.

Rated at 60 watts RMS and 480 watts peak per speaker, the STAGE358F is suited to a compatible factory radio or an aftermarket amplifier. Its 4-ohm nominal impedance is designed to work with conventional car-audio speaker channels. With 89 dB sensitivity at 2.83V and a 55 Hz to 20 kHz frequency response, it is specified for balanced everyday music playback.

The 2-way coaxial layout places a PEI balanced-dome tweeter over the woofer, helping combine high-frequency detail and midrange output from one mounting location. This arrangement can be useful where the vehicle has a single factory speaker opening and no separate tweeter provision. The speakers are intended for listeners seeking an integrated replacement rather than a multi-piece component system.

JBL uses its Plus One woofer cone architecture to increase usable cone area within the speaker frame. The laser-etched woofer cone is reinforced with 10% glass fiber, while the true 4-ohm design is intended to account for resistance elsewhere in the vehicle audio system. Together, these design choices support efficient output from compatible head units and amplifiers.

The Stage3 Gen2 design also incorporates post-consumer recycled plastic materials, PVC-free wiring, and packaging printed with soy-based inks. Two speakers, mounting hardware, foam gaskets, spade clips, logo badges, and a mini owner's manual are included. Confirm the vehicle's mounting diameter, depth, mounting-hole pattern, and factory connector requirements before installation.

Key Features

• 5-1/4-Inch Coaxial Design: Combines woofer and tweeter in each speaker.
• 60W RMS Handling: Supports compatible factory radios or external amplifiers.
• Plus One Woofer Cone: Adds cone area within the speaker frame.
• PEI Balanced-Dome Tweeter: Handles high frequencies in the coaxial assembly.
• True 4-Ohm Load: Matches common car-audio speaker-channel impedance.
• Laser-Etched Glass-Fiber Cone: Uses a 10% glass-fiber-reinforced woofer cone.

Design & Installation

The STAGE358F uses a laser-etched woofer cone with 10% glass-fiber reinforcement and a PEI balanced-dome tweeter. Its Stage3 Gen2 construction incorporates post-consumer recycled plastic materials and PVC-free wiring. These speakers are supplied without grilles and use a black and gray visual finish.

Use the included foam gaskets between the speaker and mounting surface where appropriate, then secure each speaker with the supplied screws. The included spade clips can assist with speaker-terminal connections, but vehicle-specific harness adapters may be needed depending on the factory wiring. Verify physical fitment and ensure the connected head unit or amplifier is suitable for 4-ohm speakers before installation.