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4
IN
3
4
OUT
2 IN 1
2
1
-10 dBV
button. Keep pressing the button until the 'Signal' LED lights up in
white and release. All three state LEDs will flash in green, indicating
that automatic standby has been disabled. To re-enable automatic
STATUS
RESET
CAL
standby, repeat the process. The three LEDs will flash in blue,
NETWORK
70V
25V
SIGNAL
100V
indicating that auto standby has been enabled. It is important to
4
IN
3
2
IN
2 IN 1
release the button while the 'Signal' LED is still on in white for the
operation to be successful.
2
1
-10 dBV
DSP and matrix configuration
The amplifier comprises a comprehensive range of functions that
can be setup in two ways.
• Automatic - without the use of any app or software.
• Advanced - via the software ArmonìaPlus or third-party API.
Automatic configuration
STATUS
RESET
CAL
This is a very easy way to configure the amplifier that doesn't require
NETWORK
70V
25V
SIGNAL
100V
any software.
4
IN
3
4
OUT
The automatic setup will set limiters so that a channel reaches the
2 IN 1
maximum capacity of the power supply, with a 4 dBu balanced analog
2
1
-10 dBV
input (or -6 dBFS for Dante/AES67). This means that it also adjusts the
gain so that the amplifier has the gain needed for all channels. The
way to "assign power" is then simply done by adjusting the level of the
STATUS
RESET
content to the different channels.
CAL
NETWORK
70V
25V
It will also set the high-pass filters automatically. The cutoff will be
SIGNAL
100V
4
IN
3
2
IN
selected so that frequencies below the resonance frequency, as well
2 IN 1
as frequencies that saturate transformers in Hi-Z loudspeakers, will be
2
1
-10 dBV
attenuated.
Note! Automatic configuration is only possible, and repeatable, when
no amplifier settings and parameters have been manually altered. In
the case of manual changes, it will still be possible to trigger the auto
configuration, but for verification and monitoring purposes only. The
new measured values will not be saved until settings and parameters
are set back to their initial values or a factory reset is done.
Factory Reset
To perform a factory reset, start by unplugging the mains cable. Press
and hold the push button on the amplifier's rear panel and reconnect
the mains cable while still pressing the button. Keep holding the button
(for about 10s) until the 'Signal' and 'Status' LEDs light up in red and
release. The 'Signal' and 'Status' LEDs will flash in red three times
NETWORK
confirming the factory reset. It is important to release the button while
4
IN
3
the 'Signal' and 'Status' LEDs are still on in red and to see the flashing
LEDs that confirm the reset.
2
1
Step 1 - Select the maximum voltage
NETWORK
4
IN
3
4
3
2
1
No channel will ever be assigned limiters that exceed the power of the
power supply. The main reason for selecting the maximum voltage is
to ensure that 25/70/100V loudspeakers will get the power selected
on their tapping, if a channel is using less power than it can deliver.
If the application is 25V or 70V, then there is a risk that the limiters
get set too high if the connected load isn't requiring full power. The
maximum voltage can be selected with short presses on the push
button on the amplifier's rear panel. The selected voltage will be
displayed as follows:
70V
100V
Max Peak
Max RMS
LED
LED
Voltage
Voltage
Unlit
Lit
141.4 V
100 V
peak
Lit
Unlit
100 V
70.7 V
peak
Lit
Lit
35.4 V
25 V
peak
Unlit Unlit
Custom Settings
Please note that for low-impedance loads, it is not necessary to select
the maximum voltage.
ETH
3
I4 I3 I2 I1 5V
3s
6s
ETH
1
I4 I3 I2 I1 5V
3s
6s
ETH
3
I4 I3 I2 I1 5V
3s
6s
ETH
1
I4 I3 I2 I1 5V
STATUS
SWITCHED
CAL
70V
25V
3s
6s
SIGNAL
100V
CTRL +
CTRL +
4
OUT
3
CTRL
2 IN 1
I4 I3 I2 I1 5V
-10 dBV
STATUS
SWITCHED
CAL
70V
25V
3s
6s
SIGNAL
100V
CTRL +
CTRL +
2
IN
1
CTRL
2 IN 1
I4 I3 I2 I1 5V
-10 dBV
Description
Also works in mixed configurations of 100V
and Lo-Z speakers
rms
Also works in mixed configurations of 70V
and Lo-Z speakers
rms
Also works in mixed configurations of 25V
and Lo-Z speakers
rms
Cannot be selected from the rear panel.
Parameters have been manually set for
all channels via software and automatic
configuration is not available
MAINS
MEZZO 602 AD
2
Step 2 – Calibrate
MAINS
MEZZO 604 AD
4
3
2
Press the push button until the 'Signal' LED turns purple and release
while the LED is still on. This will trigger an automatic impedance
measurement for each channel.
between Lo-Z and Hi-Z loads and will automatically set high-pass filters,
limiters and gain for each channel. Please note that it may generate an
SPL exceeding 95 dB if the loudspeakers are sensitive enough.
Following the measurement procedure, the 'Signal' and 'Status' LEDs
will flash in green, indicating that the calibration was successful. Other
colours indicate different measurement results, such as detection of
open loads or output short-circuits in the outputs. A dedicated LED chart
MAINS
with the list of possible results is available further down in this manual.
MEZZO 602 AD
2
Network Reset and Operation Mode
MAINS
MEZZO 604 AD
4
3
2
Press the push button until the 'Network' LED turns cyan and release
while the LED is still on. This will reset the amplifier's network
configurations and put it in DHCP mode. In AD models, this operation
will also change the operation mode of the ethernet ports as indicated
by the 'Switched' LED:
• Lit: The default "switched mode" configuration. The two ports
are connected and will both work for Dante/AES67 and control/
monitoring of the amplifier's DSP. It means that only one Ethernet
cable is necessary for control and Dante audio. It also means that the
product can be inserted in a daisy chain of other Gigabit Ethernet
products as long as there is enough bandwidth.
• Unlit: The internal ethernet switch is disabled. The two ports are not
connected and the port on the right-hand side is assigned to Dante/
AES67 only. The port on the left is only for controlling/monitoring
the amplifier's DSP.
Routing and control via GPI
I/O Routing - 4-Channel models
All 4-channel models allow straight 4-in/4-out analogue routing,
where analogue inputs labelled 1 and 2 are a summation of balanced
and unbalanced inputs. When using unbalanced inputs only, these
will get a 12dB boost so that normal unbalanced sources will deliver
enough level to drive the amplifier to full power. When using both
balanced and unbalanced inputs simultaneously, the latter will get a
further -30dB reduction, so that priority is given to balanced sources.
I/O Routing - 2-Channel models
All 2-channel models have mixed two unbalanced inputs (labelled
1 and 2) and two balanced inputs (labelled 3 and 4), meaning that
balanced and unbalanced sources can be used.
I/O Routing - Dante/AES67 (AD models)
In AD models, additional four Dante/AES67 inputs and outputs are
available. For these models, the source selection strategy is enabled
by default, with Dante/AES67 inputs having a higher priority over the
corresponding analogue inputs when audio signal is coming from
both source types simultaneously. The source selection and priority
settings can be configured from ArmonìaPlus or a third-party API.
VCA Operation via GPIs
In 4-channel models, the four GPI terminals located on the amplifier's
rear panel can be connected to 10kOhm passive potentiometers to
attenuate the output levels. Each GPI connector (I1, I2, I3, and I4)
corresponds to one output channel (1, 2, 3, and 4 respectively).
In 2-channel models, the output levels of channels 1 and 2 can be
attenuated with via GPI connectors I1 and I2, respectively.
4
IN
3
4
OUT
3
2 IN 1
1
-10 dBV
STATUS
SWITCHED
CAL
NETWORK
70V
3s
25V
6s
SIGNAL
100V
4
IN
3
2
IN
1
2 IN 1
1
-10 dBV
The amplifier will differentiate
STATUS
SWITCHED
CAL
NETWORK
70V
3s
25V
6s
SIGNAL
100V
4
IN
3
4
OUT
3
2 IN 1
1
-10 dBV
STATUS
SWITCHED
CAL
NETWORK
70V
3s
25V
6s
SIGNAL
100V
4
IN
3
2
IN
1
2 IN 1
1
-10 dBV
CTRL
EN
I4 I3 I2 I1 5V
CTRL +
CTRL +
CTRL
I4 I3 I2 I1 5V
CTRL +
CTRL +
CTRL
I4 I3 I2 I1 5V
CTRL +
CTRL +
CTRL
I4 I3 I2 I1 5V
MEZZO Series | 5
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