zapco Reference 1000.4, User Manual

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18
Signal Mode Switch
The Signal Mode Switch determines how the amplifier will treat the
input signal. You’ll notice that this is a three-position switch. The left position
is the “Stereo” setting. The center position is the “Bridged R Ch In ” setting.
The right position is the “L+R Sum Mono setting.
The Stereo setting is the most common. This is the position you will
use when the amplifier is going to drive both left and right speakers in a
stereo system. While this will account for 90% of our users, ZAPCO has
provided the Mode switch so the Reference Series amplifiers may also be
used in more advanced systems.
The second most common setting is the far right position, “L & R
Sum Mono”. In this position, the input stage will combine the left channel
and right channel information into a single mono channel, and feed that
information to both sides of the amplifier. You can then bridge the outputs
into a single bass channel or a single center channel. In both uses you will
have a single channel with the information from both channels of input.
NOTE: Left & Right Sum Mono is the position you will always use to drive
woofers only.
The third (center) position is “R Bridged”. This is the least common
setting, and is used primarily in large competition systems. This setting
takes information from the right input channel only and sends it to both sides
of the amplifier. This allows you to completely eliminate crosstalk between
channels by having separate right and left channel amplifiers. NOTE: This is
only used with separate right and left channel amplifiers and is NOT the
setting for woofer use.