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CHAMP Series owner‘s manual © Zeck Audio 2000
K000001A01
3.2 CHAMP 4.120
The CHAMP 4.120 has four totally independent channels which
can be used to produce two stereo signals or four monaural
signals, e.g. to supply different rooms with sound.
In Bridge mode, channels 1+2 plus channels 3+4 are
internally re-configured to work in push/pull configuration. In
this mode, the amplifier works as a two-channel amplifier but
with more available output power than in stereo mode.
3.2.1 Connection of inputs
In Stereo mode (switch (10) in “Stereo” position), each amplifier
input can be connected to an output of the audio source.
In Parallel mode (switch (10) in “Parallel” position) and
in Bridge mode (switch (10) in “Bridge” position), the input
signals must only be connected to inputs 1 and/or 3.
3.2.2 Connection of speakers
Each channel is equipped with binding post terminals for
connection of the speakers.
In Bridge mode, the speaker must only be connected to
the red terminals of channels 1+2 and 3+4 and without any
connection to ground. The total impedance of the connected
speakers must not be below 8 ohms per output in bridge
mode.
3.2.3 Volume controls
In Stereo mode, the volume of each channel can be adjusted
individually with the assigned level control.
In Parallel mode, channels 1+2 (3+4) carry identical signals.
The volume of each output can be individually adjusted with
the level controls. If outputs 1+2 (3+4) must have the same
output level, the volume controls of channel 2 (4) must be in
their full clockwise position. For non-uniform output levels,
rotating volume control 2 (4) counterclockwise attenuates the
output level of this channel in comparison to channel 1 (3).
In Bridge mode, the volume of the monaural output signal
1+2 (3+4) is adjusted with level control 1 (3).
3.3 CHAMP 4.250X
The CHAMP 4.250X has four totally independent channels
which can be used to produce two stereo signals or four
monaural signals, e.g. to supply different rooms with sound.
In Bridge mode, channels 1+2 and 3+4 are internally
re-configured to work in push/pull configuration. In this mode,
the amplifier works as a two-channel amplifier but with more
available output power than in stereo mode.
In addition to that, the CHAMP 4.250X features an X-OVER
mode for driving an active 2-way stereo speaker setup. In
this configuration, a set of integrated active crossover circuits
provides the required frequency separation (see chapter 3.3.3
for details)
3.3.1 Connection of inputs
In Stereo mode (switch (10) in “Stereo” position), each amplifier
input can be connected to an output of the audio source.
In Parallel mode (switch (10) in “Parallel” position) and
in Bridge mode (switch (10) in “Bridge” position), the input
signals must only be connected to inputs 1 and 3.
In active 2-way mode mode (both switches (17) in “X-OVER”
or “X-OVER x 10” position), the stereo input signal must be
connected to inputs 1 and 2.
3.3.2 Connection of speakers
Each channel is equipped with a 4-pole Speakon output
connector.
In Stereo mode, the Speakon connector for channel 3 (4) is
wired so that the output signal of channel 1 (2) also appears
at pole 2+. This feature allows to use 4-pole speaker cables
that carry both channel signals for a versatile and convenient
speaker wiring.
In Parallel mode, channels 1 and 2 (3 and 4) carry identical
signals (Signal 1/2 and Signal 3/4):
Fig.9: Required Speakon plug wiring for CHAMP 4.250X in
Stereo mode
Fig.10: Required Speakon plug wiring for CHAMP 4.250X in
Parallel mode
2
2+
2-
1-
1+
Signal
Channel 2
Signal
Channel 4
1
Ground
Ground Ground
Ground Ground
Ground
2+
2-
1-
1+
Signal
Channel 1
Signal
Channel 1
Signal
Channel 2
4
2+
2-
1-
1+
3
2+
2-
1-
1+
Signal
Channel 3
2
2+
2-
1-
1+
Signal 1/2
Signal 3/4
1
Ground Ground
Ground
2+
2-
1-
1+
Signal 1/2
Signal 1/2
Signal 1/2
4
2+
2-
1-
1+
3
2+
2-
1-
1+
Signal 3/4
Ground
Ground Ground
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