2. Rockford Fosgate
  3. M5-800X4
M5-800X4

Rockford Fosgate M5-800X4 Installation guide

  • Hello! I've reviewed the user manual for the Rockford Fosgate M5-800X4 amplifier and HD14-SBSUB subwoofer kit. This document provides details on how to properly tune the amplifier for use with Harley-Davidson motorcycles including instructions on setting the input levels, adjusting the crossover frequency, and utilizing the low-pass filter. I'm ready to answer any questions you might have about setting up or using these products.
  • What is the purpose of the rear and front input level settings?
    What is the recommended setting for the crossover frequency?
    What is the use of crossover switch?
2014 or NEWER Harley-Davidson®
M5-800X4 Amplifier Tuning
HD14-SBSUB Saddlebag Subwoofer Kit
07-14-2021 Eric Russell
1220-76013-01
REAR INPUT LEVEL: 02:00
Matches amplifier input to
radio’s output. Tells amp
where to “clip.”
FRONT INPUT LEVEL: 02:00
Matches amplifier input to
radio’s output. Tells amp
where to “clip.”
PUNCH EQ: MIN
Used to compensate for
acoustical deficiencies
in automotive interiors.
Not used on motorcycles.
INPUT SWITCH: 2CH
Number of inputs to feed
amplifier. Set to require
only 2 inputs to feed all
4 amplifier channels.
CROSSOVER FREQUENCY: 80Hz
The crossover’s cuto frequency.
Set to allow only low frequencies
to pass to subwoofers
(works with HP/AP/LP switch.)
CROSSOVER SWITCH: LP (Low-Pass)
Allows crossover to work in High-Pass, Low-Pass
or All-Pass (bypass). Set to allow only
low frequencies to pass to subwoofers
(works with crossover frequency dial.)
PRESET SWITCH: OFF
Used only for Motorsport (SXS) setups.
Not used on motorcycles.
Boom!™Box
Premium 6.5GT
Boom!™Box
Standard 4.3 RADIO FLASH REQUIRED
”Rockford Fosgate Tune 2014+ All Models”
REMOTE TURN-ON REQUIRED
use turn-on from brake side
Boom!™Box
Premium GTS
/