Rockford Fosgate 250.2 Operation & Installation page 28

Level Setting the BLT
8.0
VAC
+
–
• Disconnect Speaker(s) from the 250.
• 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.
Gain Overlap
+0dB*
+5dB
+10dB
*Absence of gain overlap will reduce SPL and may not permit amplifier to reach full output power due to various CD
software.
AUD
DISC
AMFM ST LD RDM
VOL PWR
® ®
1kHz Test Tone @ "0dB"
2
BLT Output (AC Volts)
2.5 VRMS
4.5 VRMS
8.0 VRMS
– 25 –
SEL
CLOCK
AUTO ILLUM
Ch
DSPL P.SCN LOUD
RPT
TUNE
D.SCN SCAN RPT RDM DIM PAUSE
1 2 3 4 5 6
® ®
BALANCED LINE TRANSMITTER
L
R
L
R
Performance Characteristics
Best S/N Ratio, Reduced SPL
(Used for Optimum Sound Quality)
Good S/N Ratio & SPL
(Use for Audiophile Listener)
Best Compromise between S/N Ratio & SPL
(Used for Average Listener)
R
a
O
p
d
e
v
r
a
a
n
t
c
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