SI-125 Power Amplifier Manual
3
F.
FUSE
: Protects the amplifier if the maximum current draw is exceeded. If the fuse blows,
see the Troubleshooting section.
G.
AC Power Cord:
Connects the amplifier to a standard 120 V, 60 Hz grounded outlet.
H.
OUTPUT TERMINALS:
Terminals are provided for 70 V and 25 V speaker lines, as
well as 8
Ω
and 4
Ω
loads. Class 2 wiring may be used.
Ensure that the amplifier is OFF
before making, removing or handling any
input or output connections. The output cover must be in place when the
amplifier is operating.
I.
ACCESSORY MODULE SLOT (for optional accessories):
Several accessory
modules are available, which may be installed into the amplifier. If no accessory module
is installed, a blank cover plate covers the slot.
Please note that the
accessory modules are not user installable
. They must be
factory installed and ordered with the amplifier. Do not remove any modules or
the cover plate.
J.
INPUT LEVEL Switch:
The Input Level switch selects the range of the input level. This
switch works in conjunction with the GAIN Control on the front of the amplifier. The
Input Level switch should be set to match the level of the input in either the 1 V or 100
mV (-20 dB) range.
K.
LOW CUT Switch:
The Low Cut switch will reduce the low-end frequency response of
the amplifier as shown in Figure 3.
Figure 3: Relative Level (dB) vs. Frequency (Hz)
L.
INPUT TERMINALS:
The input terminals are electronically balanced with an input
impedance of 10 k
Ω
. The input signal level should be in either the 1 V or 100 mV range
with the Input Level switch set to the appropriate position. The GND terminal is
provided, if required, for grounding the cable shield.