9. Fuse
– 40 Amp ATC type fuse for
the GTS300 and two 40 amp fuses
for the GTS600.
10. Gain Control
– Use this control
to adjust the input sensitivity of
the amplifier. See the “Adjusting
the Gain” section for tips on
proper setup.
11. Preamp-Output Crossover
Switch
– This switch controls the
built-in crossover that is directed
to the preamp-output connectors.
Set the switch to “Flat” for full
band operation. Set this switch to
“Low-Pass” to activate the low-
pass filter on the preamp output
(for subwoofer use). Set the switch
to “High-Pass” to activate the
high-pass filter for use with
satellite speakers.
12. Speaker Output Crossover
Switch
– This switch controls the
built-in crossover that is connected
to the power amplifier circuitry.
Set the switch to “Flat” for full
band operation. Set this switch to
“Low Pass” to activate the low
pass filter on the amplifier (for
subwoofer use). Set the switch to
“High Pass” to activate the high
pass filter for use with satellite
speakers.
13. Input Mode Selector
– This
switch is used to set the input
mode for both preamp and
speaker-level inputs.
Set this switch to Stereo for
normal operation using both left
and right inputs. Set this switch to
R to drive both the left and right
output channels with only a single
input on the right channel. Set this
switch to “L+R” to sum the left
and right inputs for a mono output
on both amplifier channels.
Power Indicator LED (on chassis
top)
– LED steadily illuminates for
normal operation. LED blinks
when protection circuitry or
muting is engaged.
14. Bass Boost Switch
– This
activates a built-in Bass Boost
circuit used to increase low-bass
output.
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