Rockford Fosgate HD9813RG-STG2 Road Glide Stage-2 Kit for Harley-Davidson 1998-2013
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What's Inside?
- • 4-Channel Powersports Amplifier
- • 11" Power/ground/turn-on & Speaker Output Harness (installed on amp)
- • 11" Input Harness (installed on amp)
- • (2) 14" RCA-to-Molex Input Adapters
- • Power/Ground/Turn-on Adapter Plug
- • (2) 7.5" Speaker Output Harnesses
- • 3mm Allen key
- • (2) 2-way Speakers
- • (2) Grilles (installed)
- • (6) 3/4" Mounting Screws
- • Owner's Manual
Built for the Road, Tuned for Real Harley Performance
The Rockford Fosgate HD9813RG-STG2 4-channel amp Motorcycle Amplifiers is a serious upgrade for 1998–2013 Harley-Davidson Road Glide riders who want clean, loud, and reliable sound on every ride. The high-output M5-800X4 amplifier delivers up to 100 watts RMS per channel with flexible 2Ω and 4Ω operation, plus up to 200 watts bridged when you want to push your system further. It is built for riders who want strong front-stage clarity and the option to expand their audio setup without sacrificing control or sound quality.
Clean Power, Smart Tuning, and All-Weather Durability
This system is built to handle real riding conditions without breaking down or sounding harsh. Element Ready engineering protects against water spray, UV exposure, dust, vibration, and corrosion with marine-grade sealing and epoxy-coated circuitry. Class-AD high-efficiency design keeps power strong while reducing strain on your charging system, so you can ride longer with high-volume audio. CLEAN gain calibration with clip indicators makes tuning simple and distortion-free, while PRESET optimization helps quickly align EQ, crossover, and gain settings for Rockford systems. Add in a fully adjustable crossover network, Punch EQ bass and treble control, and included TMS6RG 6.5 inch fairing speakers, and you get a complete plug-and-play upgrade with CEA-2006 certified power you can trust.
Frequently Asked Questions (FAQ)
- • Why Does My HD9813RG-STG2 Sound Distorted After Increasing the Volume?
Distortion at higher volume can happen when the amplifier is incorrectly tuned or the input level is too aggressive. Rockford warns that changing its recommended amplifier settings can lead to poor performance and even speaker failure.
- • Why Does My Road Glide Audio Sound Weak Despite the 800-Watt Amplifier?
The kit's amplifier is rated at 800 watts peak / 400 watts RMS, but output depends on correct input levels and tuning. Verify the amplifier settings before assuming the speakers or amplifier are underpowered.
- • Why Does One Fairing Speaker Have Less Output Than the Other?
A difference between the two speakers can come from a loose connector, incorrect polarity, amplifier-channel settings, or a damaged wire. Swapping the speaker connections between channels can help identify whether the issue follows the speaker or the amplifier channel.
- • Why Does My System Cut Out When Riding Over Rough Roads?
Road vibration can expose a loose power, ground, speaker, or signal connection. Since the system is installed on a motorcycle and specifically designed for vibration resistance, inspect the harnesses and mounting points if audio disappears after hitting bumps. Rockford describes the system as Element Ready for motorcycle vibration, water, dirt, and UV exposure.
- • Why Does the System Require Specific Amplifier Tuning?
The HD9813RG-STG2 is designed around Rockford's M5 amplifier and TMS speakers, so the recommended tuning is not interchangeable with random amplifier settings. Rockford provides a dedicated M5-800X4 tuning configuration for the 1998–2013 Road Glide system.
- • Why Does My Factory Radio Need to Be Flashed?
When using the factory Harley radio with this version of the Stage 2 kit, the radio requires the appropriate programming so its signal works correctly with the aftermarket amplifier. The installation documentation specifically states that a factory radio must be flashed.
- • Why Does the Installation Take Longer Than a Simple Speaker Replacement?
Although Rockford describes the system as plug-and-play, installation involves removing the ECU cradle, battery connection, fairing, and gas tank, followed by speaker installation, amplifier wiring, tuning, testing, and reassembly.
- • Why Does My HD9813RG-STG2 Have No Sound After Installation?
A completely silent system can result from an incorrectly connected power harness, amplifier input, speaker wiring, or battery connection. Rockford recommends diagnosing installation problems before requesting a replacement because many returned products are found to have no trouble due to incorrect installation.
- • Why Can't I Use Any EQ Setting I Want With This System?
The HD9813RG-STG2's tuning is designed around the specific frequency response of Rockford's amplifier and TMS speakers. Rockford states that its audio-kit presets are intended specifically for these combinations and should not be treated as universal settings for other amplifier or speaker brands.
- • Why Does My System Sound Different After Adding Extra Speakers?
The amplifier has additional channels intended for possible expansion with Tour-Pak or saddlebag speakers. Adding speakers changes the system configuration, so the appropriate audio-kit preset and amplifier setup should be selected rather than simply connecting additional speakers.
Features:
- Road-Grade 4-Channel Power Upgrade System for Harley-Davidson Touring Audio Integration: Engineered for 1998–2013 Harley-Davidson Road Glide platforms, this Rockford Fosgate HD9813RG-STG2 system delivers a complete high-performance amplification and speaker upgrade designed for riders demanding clean output, durability, and factory-integrated control retention.
- High-Output 4-Channel M5-800X4 Amplifier Architecture: Delivers up to 100 watts RMS per channel with stable 2Ω/4Ω operation and up to 200 watts bridged, providing flexible system tuning for front-stage clarity and expanded output configurations.
- Element Ready Environmental Hardening: Built with marine-grade circuit protection, epoxy-coated boards, and sealed hardware to resist water spray, UV exposure, dust ingress, vibration stress, and corrosion in extreme riding conditions.
- Class-AD High-Efficiency Power Delivery: Advanced amplifier topology maximizes output efficiency while minimizing current draw, supporting sustained high-volume performance without excessive strain on the motorcycle charging system.
- Integrated CLEAN Gain Calibration System: Onboard clip-indicator technology enables precise input/output level matching for distortion-free tuning without external measurement tools or complex setup procedures.
- PRESET Optimization Mode Functionality: Simplifies configuration by automatically aligning crossover points, EQ curves, and gain structure when used with compatible Rockford Fosgate systems.
- Fully Adjustable Active Crossover Network: Independent high-pass and low-pass filters (50Hz–250Hz, 12dB/octave) allow precise frequency separation for front and rear channels, improving staging and speaker protection.
- Punch EQ Bass and Treble Enhancement Control: Provides selectable frequency-based boost profiles with up to +18dB bass reinforcement and +14dB high-frequency lift for customizable sound shaping.
- Premium 6.5” TMS6RG Fairing Speakers: Weather-resistant coaxial drivers with Santoprene surrounds, polypropylene cones, and neodymium motor structures deliver high output and clarity in open-road environments.
- Complete Plug-and-Play Wiring Integration Kit: Includes pre-loomed 8-gauge OFC power/ground cabling, signal harnesses, and fused battery protection for streamlined installation and OEM-grade reliability.
- CEA-2006 Certified Power Performance Standards: Ensures verified RMS output ratings under standardized testing conditions for accurate performance comparison and dependable real-world output behavior.
Specifications:
- Speaker Qty: 2
- Amplifier Type: External
- Total Power: 800 Watts
- Grille/Trim Ring Included: Yes
- Mounting Hardware: Yes
- Included In The Box
- (1 pr) TMS6RG
- (1 ea) M5-800X4
- (1 ea) RFK-HD9813M5
- UPC: 780687362560
- Weight: 17
- Authorized Internet Dealer
Warranty: 2 Year(s) Warranty.
This item is accompanied by a manufacturer's warranty. If it is found to be defective, it may be returned to OnlineCarstereo.com for replacement within 2 Year(s) from the original date of purchase with proper return authorization.
