Rockford Fosgate HD14U-STG2 Stage 2 audio kit for motorcycles includes 2 sets of speakers 2014-up Harley-Davidson
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What's Inside?
- • (2) TMS65 6.5" Fairing Speakers
- • M5-800X4 4-Channel Powersports Amplifier
- • RFK-HD14M5 Amp Installation Kit
- • Owner's Manual
Big Power That Turns Your Harley Into a Rolling Concert
The Rockford Fosgate HD14U-STG2 audio kit is built for riders who want serious, clean volume that actually keeps up with highway riding. At the core is the M5-800X4 4-channel amplifier delivering up to 100 watts RMS per channel with bridging capability, giving you strong, controlled power for both fairing and Tour-Pak speaker setups. It is designed to hit hard without distortion, so your music stays tight and clear even when you are pushing speed and wind noise is fighting back.
Built Tough for Real Riding Conditions
This kit is made to survive the same conditions you ride through. With Element Ready construction, you get IPX6-rated sealing, marine-grade protection, and corrosion-resistant hardware that holds up against rain, dust, vibration, and harsh UV exposure. Inside, Class-AD high-efficiency design keeps power delivery strong while reducing strain on your bike’s electrical system. MEHSA 4 thermal management helps control heat buildup, and DSM precision circuitry keeps your signal clean and stable, even on long, high-volume rides.
Dialed-In Sound Control with Easy System Expansion
What makes this setup stand out is how easy it is to tune and expand. The CLEAN gain calibration system uses built-in clipping indicators so you can match levels without guesswork, keeping everything distortion-free. You also get flexible crossover and EQ controls with high-pass, low-pass, and full-range options plus Punch EQ shaping for bass and treble tuning. With multi-channel routing, speaker-level and line-level inputs, and bridged output capability, you can build out a full front-to-rear system. The included OEM-style wiring kit with 8-gauge copper wiring, fused power distribution, and plug-and-play harnesses keeps installation clean and straightforward so you spend more time riding and less time wiring.
Rockford Fosgate HD14U-STG2 Installation Videos
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Frequently Asked Questions (FAQ)
- • Why Does My HD14U-STG2 Sound Distorted After Installation?
Incorrect amplifier gain, EQ adjustments, or crossover settings can introduce distortion even when the wiring is correct. Rockford specifically warns that changing its recommended tuning can cause poor performance and potentially lead to speaker failure.
- • Why Do I Need to Flash the Factory Harley Radio?
The HD14U-STG2 uses the factory radio with an aftermarket amplifier, so the radio requires the proper Rockford/Harley flash for the system to operate correctly. Rockford confirms that the factory radio must be flashed for this kit.
- • Why Does My System Sound Too Quiet Even With the 800-Watt Amplifier?
High amplifier power does not guarantee maximum volume if the factory-radio output, gain structure, or tuning is incorrect. Harley owners installing Rockford systems have specifically discussed the need for the radio flash to flatten the factory EQ before amplification.
- • Why Do the Tour-Pak Speakers Sound Different From the Fairing Speakers?
The two pairs are installed in completely different acoustic locations, so reflections and listening position can make the rear speakers sound less direct. The HD14U-STG2 uses two 6.5-inch fairing speakers and two 6.5-inch Tour-Pak speakers, each powered by separate amplifier channels.
- • Why Does My Audio Cut Out When I Turn the Volume Up?
A high-volume dropout can point toward amplifier protection, an unstable power connection, incorrect impedance, or an improperly configured system. Before replacing a speaker, check the amplifier status, battery connections, grounds, and speaker wiring.
- • Why Does the System Sound Harsh After I Adjust the EQ?
The Stage 2 system is tuned around specific amplifier and speaker settings. Rockford cautions against independently “tweaking” the recommended settings because excessive EQ or gain can negatively affect both sound quality and speaker reliability.
- • Why Is My Installation Not Completely Plug-and-Play?
Although the kit includes the amplifier, speakers, brackets, power wiring, and installation hardware, installation still requires accessing the motorcycle's electrical system and completing the required radio flash. Rockford also advises checking the compatibility chart before installation because fitment varies across Harley models and years.
- • Why Does One Side of My HD14U-STG2 Sound Weaker?
A weak left or right side can result from a loose speaker connector, incorrect polarity, amplifier-channel settings, or a problem with the source signal. Move the speaker connection to another amplifier channel to determine whether the problem follows the speaker or stays with the original channel.
- • Why Did My Audio Change After a Radio Software Update or Service Visit?
Changes to factory-radio software or programming can alter the audio processing applied before the amplifier receives its signal. Rockford's dedicated tuning guidance exists because the aftermarket amplifier and speakers depend on the correct factory-radio configuration.
- • Why Does My HD14U-STG2 Stop Working Even Though the Radio Still Turns On?
A working display does not necessarily mean the external amplifier is receiving power and signal. Check the amplifier fuse, power and ground connections, T-harness, speaker wiring, and radio-flash configuration. Rockford notes that many returned products have no actual fault because of incorrect installation, so installation troubleshooting should come before requesting a replacement.
Features:
- High-Output M5-800X4 4-Channel Amplifier Core: Delivers up to 100 watts RMS per channel with bridging capability, providing strong, clean amplification for fairing and Tour-Pak speaker configurations.
- Element Ready All-Weather Construction Engineering: Built with IPX6-rated sealing, marine-grade circuit protection, and corrosion-resistant hardware to ensure stable performance in rain, dust, vibration, and UV exposure.
- Advanced Class-AD High-Efficiency Power Design: Optimizes output delivery while reducing current draw from the motorcycle electrical system, supporting sustained high-volume playback without system strain.
- MEHSA 4 Thermal Management Architecture: Enhances heat dissipation across MOSFET components to reduce thermal buildup, improve efficiency, and extend amplifier lifespan under continuous load.
- DSM Precision Circuit Technology: High-tolerance surface-mount component layout reduces noise interference, improves signal integrity, and enhances long-term operational stability.
- CLEAN Gain Calibration System: Integrated clipping indicators enable precise input and output gain matching, simplifying tuning and ensuring distortion-free audio performance.
- Flexible Crossover and EQ Control Suite: Adjustable high-pass, low-pass, and full-range filtering combined with Punch EQ bass and treble shaping for customized system tuning.
- Multi-Channel Signal Routing Flexibility: Supports line-level and speaker-level inputs with bridged output capability for expanded system design and multi-zone audio distribution.
- Complete OEM-Style Wiring Integration Kit: Includes 8-gauge oxygen-free copper wiring, fused power distribution, amplifier mounting bracket, and plug-and-play harnesses for streamlined installation.
- Dual Speaker System Expansion Capability: Supports fairing and Tour-Pak 6.5" speaker integration, enabling full front-to-rear sound coverage with balanced output distribution.
Specifications:
- Speaker Qty: 4
- Amplifier Type: External
- Total Power: 800 Watts
- Grille/Trim Ring Included: Yes
- Mounting Hardware: Yes
- Included In The Box
- (2 pr) TMS65
- (1 ea) M5-800X4
- (1 ea) RFK-HD14M5
- UPC: 780687362539
- 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.
