Rockford Fosgate 250.2 Stereo Amplifier User Manual


 
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Level Setting the BLT
Disconnect Speaker(s) from the 250.2
CD Software used to set levels is a test tone of 1kHz at “0dB” or “All Bits High”
Source Unit set to 3/4 volume (or maximum unclipped output)
Remove BLT Cover to access
test pads
and
gain pots
AC Voltmeter set to
AC Volts
AC Voltmeter “–” connected to
RCA shield
of BLT
AC Voltmeter “+” connected to
test pad
inside the BLT
Adjust BLT Gain from
2.5 VRMS min.
to
8.0 VRMS max
per test pad (see chart below)
Be sure the time index reads greater than 30 seconds on source unit.
*Absence of gain overlap will reduce SPL and may not permit amplifier to reach full output power due to various CD
software.
Gain Overlap BLT Output (AC Volts) Performance Characteristics
+0dB* 2.5 VRMS Best S/N Ratio, Reduced SPL
(Used for Optimum Sound Quality)
+5dB 4.5 VRMS Good S/N Ratio & SPL
(Use for Audiophile Listener)
+10dB 8.0 VRMS Best Compromise between S/N Ratio & SPL
(Used for Average Listener)
a
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+
VAC
BALANCED LINE TRANSMITTER
®
®
1kHz Test Tone @ “0dB”
L
R
L
R
AUD
SEL
1 2 3 4 5 6
RDM
RPT
SCAN
PAUSE
D.SCN
DIM
AM
FM
Ch
RPTLD
RDM
DISC
ST
P.SCN LOUDDSPL
R
CLOCK
ILLUM
PWR
AUTO
® ®
VOL
TUNE
8.0