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MODE CONFIGURATIONS

Bridge Mode

Amplifier channel A and B may bridged together to make a single output with a power rating equal to the
sum of both channel power ratings at twice the load rating of a single channel. In other words, bridging two
amplifiers rated for 200 watts into 4 ohms will produce 400 watts into 8 ohms. In Bridge Mode, the channels
operate at opposite polarity from each other so that one channel “pushes” and the other “pulls” equally. This
mode sends the input signal to channel A and the same signal with its polarity reversed to the channel B.
Connect the input signal to channel A input connector only and set the DUAL/BRIDGE Mode Switch (14) to
BRIDGE. Both channel level controls (A and B) MUST be used to control the signal level, and

both

MUST be

set at the same position. The input level controls are detented so you can match these settings precisely.

The  loudspeaker  load  is  connected  only  to  the  designated  positive  (+)  output  terminals  of  the  bridged
channels.  For  proper  signal  polarity,  connect  the  positive  (+)  terminal  of  the  loudspeaker  system  to  the
positive  (+)  terminal  of  OUTPUT  A;  subsequently,  connect  the  negative  (-)  terminal  of  the  loudspeaker
system to the positive (+) terminal of OUTPUT B.

NEVER ground either side of the loudspeaker load cable when the amplifier is in Bridge Mode,
as both sides are “hot.”

If an output patch panel is used, all connections must be isolated from each

other and from the panel. Using the LOW-Z output configuration, the minimum nominal load impedance in
Bridge Mode is 8 ohms; this is equivalent to driving both bridged channels at 4 ohms. Using the 70V output
configuration, the bridged output is 140V and the minimum nominal load impedance in Bridge Mode is 50
ohms; this is equivalent to driving both bridged channels at 25 ohms. Driving loads of lesser impedance may
activate the protective muting system. See OUTPUT MODES below.

NOTE:

Regardless of operating mode,

NEVER connect the amplifier outputs together

CAUTION:

Output voltages greater than 120 volts rms are available between the bridged terminals.

Class 3 wiring must be used in accordance with national and local codes to connect the loudspeaker
system.

WARNING:

The loudspeaker output connections of this amplifier are hazardous when live and present a shock

hazard when they are energized. Take the following precautions:

1. Do not touch any bare wires that are connected to the loudspeaker output connectors.
2. Use insulated loudspeaker cables and touch-proof connectors on the loudspeakers.
3. Do not attempt to make connections to the output connectors or to loudspeaker connectors when the
amplifier is turned on.
4. Double check all connections and make sure there are no exposed wires or connectors before turning the
amplifier on.
5. Make sure there are no frayed cables or wires and that all connections are tight and secure every time before
turning the amplifier on.
6. External wiring connected to these terminals requires installation by an instructed person or the use of ready-
made leads or cords.