Signal Input Connections; Output Connections And Channel Linking With The Flexipower Function - Ecler HZA4-120F Bedienungsanleitung

3.3. Signal input connections

The amplifier HZA4-120F features 4 balanced and line level analog signal inputs (one per
amplification channel) on its rear panel.
Signal input connectors are 3 position
screw terminal block (40, 41, 43, 45). The wiring
is:
HOT or direct signal
COLD or inverted signal
GROUND
For unbalanced connection short-circuit
pin  to pin -.
STACK outputs (42, 44) available for inputs 1 and 2 are parallel to the input and serve to re-send
the signal of these inputs (INPUTS, CH1 / CH2) to other input channels, amplifiers or sound systems.
The input impedance is 20K (balanced) with a nominal input sensitivity of 0dBV(1V). This
impedance makes possible to parallel several amplifiers without loosing audio quality.

3.4. Output connections and channel linking with the FLEXIPOWER function

The rear panel OUTPUTS section is fitted with two position screw terminal block (35, 36, 37, 38)
for each amplifier channel. Always respect the relative polarity for outputs (0 and 100 on each output
connector), wiring and speakers.
The FLEXIPOWER Function: a MERGE switch is installed between each pair of output
connectors:

When the switch is in the top position, the pair of channels has an independent behaviour; the
FLEXIPOWER function will not be active

When the switch is in the lower position (MERGE), the two channels will be linked and their
individual power will be added:
o The two outputs of the pair of channels and the speaker lines connected to these
channels will be connected in parallel
o The MERGE LED (6, 11, 16) light on the front panel, between the pair of channels, will
be lit
o The audio content of the pair of channels becomes the sound source connected to the
input of the channel with a lower number (input 1 for channel pair 1&2, input 2 for
channel pair 2&3, input 3 for channel pair 3&4)
o The active front and remote volume control (if used) of the channel pair becomes that
of the channel with a lower number (controls on channel 1 for channel pair 1&2,
controls on channel 2 for channel pair 2&3, controls on channel 3 for channel pair
3&4)
2, 3 or 4 adjacent channels can be linked (with a resulting double, triple or quadruple power), with the
following sound source and volume control arrangement:
Independent
CHANNEL 1 IN 1
CHANNEL 2 IN 2
CHANNEL 3 IN 3
CHANNEL 4 IN 4
6
> Pin +
> Pin -
Pin 
>
FLEXIPOW ER inputs routing and associated volum e controls
M ERGED CHANNELS
1 & 2 2 & 3
IN1
IN1
IN2
IN3
IN4 IN4
3 & 4 1 & 2 & 3
IN1
IN2 IN1
IN3
IN4
2 & 3 & 4 1 & 2 & 3 & 4
IN1
IN1
IN2