Operation; Adjusting Gain; Adjusting Crossover (X-Over); Troubleshooting - Lightning Audio FF150.2 Installation And Operation Manual

Operation

ADJUSTING GAIN

To adjust the gain setting, turn the amplifier gains all the way down. Turn the source unit volume
up until distortion is audible and then turn it down a bit until the distortion is inaudible. Next, turn
the amplifier gain setting until once again distortion is audible and then back it down until the
distortion is inaudible.
NOTE: For a more in depth setting procedure, contact Lightning Audio Technical Support.

ADJUSTING CROSSOVER (X-OVER)

Turn the crossover adjustment knob all the way down. With the system playing at normal
listening level, turn the crossover adjustment knob up slowly until the desired crossover point is
achieved.

Troubleshooting

Symptom
Amplifier does not
turn on.
Amplifier Noise
(Turn-On Pop)
Engine Noise

Specifications

FF250.1
• Maximum Power: 750 watts
• Power Rating:
250w x 1 @ 2ohms
150w x 1 @ 4ohms
• Input Sensitivity: 150mV - 4V
• High Level Input: 1.5V - 14V
• Signal to Noise Ratio: > 90dBA
• Channel Separation: 50dB
• Crossover Type: Variable 40~130Hz
• Amplifier Fuse Value: 15Amp (2)
• Chassis Size: 2"H x 11.1"W x 9.8"D
Specifications subject to change
without notice
8
Diagnosis
B+ or REM not between 10.5 and
15.5 volts or no voltage present
Amplifier is not properly grounded.
Voltage spike from source unit is
entering amplifier's input
Noise is radiating into signal cables
Remedy
Check the alternator, battery, fuse,
and wiring and repair as necessary
Check wiring and repair as necessary
Connect turn-on module to REM
terminal if pops are eliminated with
no input signal to amplifier
Re-route signal cables away from
sources of high current
FF150.2
• Maximum Power: 450 watts
• Power Rating: 50w x 2 @ 4ohms
75w x 2 @ 2ohms
150w x 1 @ 4ohms
• Input Sensitivity: 150mV - 4V
• High Level Input: 1.5V - 14V
• Signal to Noise Ratio: > 90dBA
• Channel Separation: 50dB
• Crossover: High/Low/All Pass switch
• Crossover Type: Variable 40~400Hz
• Amplifier Fuse Value: 25Amp (1)
• Chassis Size: 2"H x 11.1"W x 6.9"D