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Amplifier Operation
The Ci amplifier is an eight channel amplifier. It can be configured in combinations
of bridged and single (stereo) channels. For instance, channels 1, 2, 7 and 8 can be
independent (stereo) channels while channels 3 and 4 are bridged and channels 5
and 6 are bridged. Each channel pair (1 & 2 or 3 & 4 or 5 & 6 or 7 & 8) has an
associated Mode switch for Stereo or Bridged operation. When in stereo mode
the channel pair act as independent amplifier channels. When in bridged mode, the
channel pair is setup to run as one more powerful channel.
Stereo
For stereo operation, turn the amplifier off and set the Mode Select Switch to the
stereo position. In this mode, both channels operate independently of each other,
with the input attenuators controlling each channel's level. Thus, a signal at Channel
2's input produces an amplified signal at Channel 2's output, and the same for other
stereo channels.
Parallel Mode
To send the same signal to both channels, connect the input signal to Channel 1
via the Input Barrier Strip. Run jumpers from the positive and negative terminals
of Channel 1 Input Barrier Strip to the respective terminals of Channel 2. Both
channels then share Channel 1 input signal, but will operate independently. Speakers
are connected as in Stereo Mode.
Bridged Mono
For Bridged operation, turn the amplifier off and set the Mode Select Switch to
Unbalanced
the Bridge position. This Mode straps the two adjacent amplifier channels together,
Connection
making a very powerful single channel. One channel "pushes" and the other "pulls"
+
equally, effectively quadrupling the power of either channel alone. When in bridged
2 cond
sheilded
mode, the odd chaneel controls act as the master controls for both channels. Signal
Gnd
cable
is connected to the odd channel only (1, 3, 5, or 7). The level is set using the odd
channels attenuator. The even channel attenuator should be set to off
The speakers are connected only to the designated "+" output terminals for
that channel pair. Use extreme caution when operating in the bridged mode, as
potentially lethal voltage may be present at the output terminals.
Unlike the stereo mode, in which one side of each output is grounded, both sides
are hot in bridged mono mode. Channel A's side is the same polarity as the input.
Never ground either side of the speaker cable when the amplifier is in bridged
mono mode; both sides are "hot. " If an output patch panel is used, all connections
must be isolated from each other and from the panel.
Note: Use extreme caution when operating in bridged mono
mode.
-
Never ground either side of the speaker cable when the amplifier is in bridged
mono mode; both sides are "hot. " If an output patch panel is used, all connections
+
must be isolated from each other and from the panel. For Ci Series amplifiers, the
recommended minimum nominal load impedance in bridged mono mode is 8
Dual (stereo)
ohms, the equivalent to driving both channels at 4 ohms. Driving loads of less than
the recommended minimums will activate the IGM circuitry, resulting in a loss of
power, and may also cause a thermal protect condition.
Regardless of operating mode, NEVER connect amplifier outputs
together!
SPST Momentary Switches
Shield
-
+
+
-
Bridged
Unbalanced
Connection
+
2 cond
sheilded
Gnd
cable
Shield
6
dB 0
-
-
+
+
Ch 1 Ch 2
Dual (stereo)
SPST Momentary Switches
On
Off
Ci
owner's manual
TM
6
dB 0
+
-
Bridged
6
dB 0
Ch 1 Ch 2
Off
Com
6
dB 0
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