MODE SWITCH OPERATION
LIMITER
A limiter is a circuit that prevents signal overload and distortion in an audio signal path. When engaged,
the internal limiter circuit will keep the audio signal from going over a preset level threshold, thereby
helping to prevent signal distortion within the amplifier and in the speaker system. The limiter also
serves to prevent speaker damage. The limiter function can be engaged by engaging
MODE
SWITCHES SW2
(for INPUT A) and
SW5
(for INPUT B) in the up “
ON
” position.
LO CUT
MODE SWITCHES SW3
,
SW4
(for
INPUT A
) and
SW6
,
SW7
(for
INPUT B
) provide the options of low
frequency filtering starting at the
30Hz
and
50Hz
frequency ranges and frequencies below those points.
These filters “roll off” the lower bass frequency range to help eliminate unwanted “boominess” in the
sound system with a -12dB per octave slope. MODE Switch
SW4
engages the “
LO CUT
” filter and
Switch
SW3
selects between the
30Hz
(in the up, “
ON
” position) and
50Hz
(in the down “OFF” position).
INPUT MODE
The
INPUT MODE
switches select the operating mode of the amplifier.
STEREO
mode allows the unit
to function as a two channel amplifier with each input (
INPUT A
&
INPUT B
) routed to a separate
amplifier output (
OUTPUT A
&
OUTPUT B
), respectively.
PARALLEL
mode sums the signals of
INPUT A
and
INPUT B
together and routes the combined signal
to both
OUTPUT A
and
OUTPUT B.
BRIDGE MODE
This mode allows you to combine the amplifier outputs for more power.
MODE SWITCHES #10, 11
and
12
control this function.
BRIDGE MODE
can provide nearly three times more power output than
operating the amp in
STEREO
mode.
When in
BRIDGE MODE
, only the controls on
INPUT A
are functional.
INPUT B MODE SWITCH
settings have no affect on the operation of the amplifier when in
BRIDGE MODE
and the volume control
for
INPUT B
should be set all the way down when operating in this mode.
BRIDGE MODE
provides a single 4
Ω
or 8
Ω
output for connection to an equivalent speaker impedance
load. Be aware of the increased power output that
BRIDGE MODE
provides and be sure that all
speakers have appropriate power handling capabilities before making connections otherwise speaker
damage may occur. Speaker wiring for
BRIDGE MODE
is made via the two middle output binding post
terminals. See pages
10
and
13
for
BRIDGE MODE
wiring details.
8
S-SERIES
Professional Amplifiers
