Rockford Fosgate HD9813SG-STG2 6.5" Harley Audio Kit

The Rockford Fosgate HD9813SG-STG2 is a Stage 2 motorcycle audio upgrade for select 1998-2013 Harley-Davidson Street Glide and Electra Glide models. It combines a pair of motorcycle-specific 6.5-inch fairing speakers, an external four-channel amplifier, and a vehicle-specific amplifier installation kit. The system is intended for riders who want more capable fairing audio while retaining a factory-fit installation approach.

The included TMS6SG speakers use a two-way coaxial design with 25 mm dome tweeters and phase-aligned tweeter assemblies. Their 4-ohm design, 75-watt RMS rating per speaker, and weather-resistant construction are tailored to the open-air motorcycle environment. The result is a focused full-range front soundstage designed for fairing locations.

Power comes from the included M5-800X4, a four-channel Class-AD amplifier with IPX6 water-spray protection. It provides 100 watts RMS per channel at either 2 or 4 ohms, with channels available for later system expansion where appropriate. Adjustable high-pass and low-pass crossovers help match the amplifier to the installed speakers and system layout.

The RFK-HD9813M5 installation kit is designed for the 1998-2013 Harley-Davidson platform and supplies the mounting hardware and dedicated wiring needed for the amplifier installation. The kit's direct-connect harnessing is intended to reduce the need for cutting into the motorcycle's factory wiring. Grilles and speaker mounting hardware are also included for the front-speaker installation.

This package is a speaker-and-amplifier kit, not a replacement radio kit. It is suited to an existing compatible audio source and can serve as the foundation for a larger Rockford Fosgate Harley audio system. The amplifier's unused channels can support compatible expansion speakers when the system is configured and wired correctly.

Key Features

• Stage 2 Harley Audio Kit: Combines front fairing speakers, a four-channel amplifier, and application-specific installation hardware.
• 6.5-Inch TMS6SG Speakers: Two-way coaxial fairing speakers provide a direct-fit front-speaker upgrade.
• 25 mm Dome Tweeters: Phase-aligned tweeters help deliver clear high-frequency detail from the fairing.
• M5-800X4 Amplifier: Four-channel Class-AD amplification provides 100 watts RMS per channel.
• Element Ready Construction: Speakers and amplifier are designed for exposure to water, UV, dirt, vibration, and corrosion.
• Vehicle-Specific Wiring Kit: RFK-HD9813M5 hardware and harnesses support a more straightforward amplifier installation.

Design & Installation

The TMS6SG speakers use reinforced polypropylene cones, Santoprene components, neodymium motor structures, high-temperature glass-reinforced polymer frames, and integrated crossovers. The M5-800X4 uses a die-cast aluminum heatsink, integrated harness connections, and an IPX6-rated Element Ready enclosure. Together, these components are engineered for the vibration, moisture, temperature changes, and outdoor exposure associated with motorcycle use.

Verify exact motorcycle fitment before ordering, especially on CVO and Screaming Eagle models, which may require modification. Install the amplifier with the included RFK-HD9813M5 harnesses and hardware, use the specified fused power connection, and set gain and crossover controls during final setup. This kit does not include a head unit, so it should be connected to a compatible existing source system.