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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)
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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