Rockford Fosgate 250 sERIES Installation & Operation Manual page 28

Level Setting the BLT
8.0
VAC
+ –
• Disconnect Speaker(s) from the 250x
• 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 BLT Output (AC Volts)
+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
CLOCK
DISC
Ch
DSPL
AM FM ST LD RDM RPT
VOL
PWR
D.SCN
1
® ®
1kHz Test Tone @ "0dB"
®
BALANCED LINE TRANSMITTER
L
R
2
2.5 VRMS
4.5 VRMS
8.0 VRMS
– 24 –
R
SEL
AUTO ILLUM
P.SCN LOUD
TUNE
SCAN RPT RDM DIM PAUSE
2 3 4 5 6
®
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)
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