Switch Settings - Alpine 3554 Service Manual

Switch Settings
Input Mode Selector Switches @ and ©:
a) Set to the "ST" position (center) when the amplifier is
used as a 4-channel stereo system.
ro
L(MONO) ST L+R
b) Set to the "L (MONO)" position when the amplifier is
used for one channel of a stereo or bridged system.
a
L({MONO) ST L+R
c) Set to the "L+R" position when the amplifier is used
for the subwoofer system which uses the right
channel and left channel signals summed.
—
L(MONO) ST L+R
Active Dividing Network Selector Switches @ and ©
a) Set to the "LP" position when the amplifier is used for
the low-pass (sub-woofer) system. The frequencies
higher than 80 Hz will be cut (at a rate of 18 dB per
octave).
b) Set to the "HP" position when the 3554 is used for
the high-pass (tweeter/midrange and subwoofer)
system. The frequencies lower than 80 Hz will be cut
(at a rate of 18 dB per octave).
TS
OFF HP LP
3554
c) Set to the "OFF" position when the 3554 is used for
the regular stereo system with full-range speakers.
The full bandwidth will be output without cutting the
high or low frequencies.
pe,
OFF HP LP
Fixed/Variable Input Selector Switches @ and ©:
a) Set to the "FIXED" position when connecting the
3554 to other Alpine products. This position sets the
input sensitivity to 500 mV which corresponds to the
pre-amp output of Alpine products.
r— L_
VARIABLE FIXED
b) Set to the "VARIABLE" position when connecting the
3554 to a non-Alpine product with an output voltage
other than 500 mV. This position should also be used
when adjustment of input sensitivity is required to
obtain certain imaging requirements or to
compensate for different speaker efficiencies.
ane |
VARIABLE FIXED
Input Gain Controls ® and ©:
After setting the Input Select Switches @ and © to the
"VARIABLE" position, rotate the Input Gain Controls 4 and
5 with a #0 screwdriver and adjust the input gain to the
point where there is maximum volume with no distortion.
Status Monitor:
This indicator lights green when the power is on. The 3554
has built-in protection circuitry. If, for some reason, this
protection circuit is activated, the indicator turns orange.
If this happens, turn the system off, find the cause of the
problem and remedy the situation. This includes checking
all your connections and wiring. If the indicator remains
orange when the system is turned on, consult yourauthor-
ized Alpine dealer.
Note: The indicator will illuminate in orange for a iew
seconds when the power is turned on as the
protection circuit will be activated. This is normal.