Marani MDA-KDM Series User manual

1
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MDA-KDM series digital
power amplifier
Digital power amplifier
MDA-KDM series

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Important Use Safety Introduction
Firstly, thank you for purchasing and using our company's products. In this user manual, you will have a detailed understanding of the
functions and usage of this device. Before you power on, it is necessary to read the following content.
Safety instructions
1. Please do not expose this machine to damp environments. Any container containing liquid, such as a vase, should not be placed on
the machine.
2. Do not use this machine near heat sources or in enclosed spaces. It should be kept in a well ventilated and heat dissipating
environment for use.
3. If necessary, use a clean cloth dipped in water to clean, do not use any organic solvents to clean the body, and do not block any
ventilation openings.
4. During thunderstorms or when not in use for a long time, please unplug the power plug of this product.
When the device is damaged, such as the power cord or plug being damaged, liquid spilling or objects falling into the device, or the
device being exposed to rain or moisture for a long time, please immediately turn off the machine and disconnect the power, and take
it to the dealer for maintenance.
6. This device is only installed inside the cabinet.
7. Only accessories/accessories specified by the manufacturer can be used.
8. Use the power plug provided by this product correctly. The standard power plug provided by this product can provide you with
more safety assurance.
9. Warning: If the grounding is damaged, the machine or the system connected to it may cause the casing to become live. If the casing
and ground are touched simultaneously, it can cause serious injury or even death.
10. Before use, please confirm whether the load system parameters match the machine, such as impedance, maximum power, etc.
1 Installation
1.1 The input AC power supply of this machine can be adapted to 90-240V, 50-60Hz. The third pin (grounding pin) on the power cord
included in the packaging is a necessary safety component. Do not attempt to disable this grounding connection by using an adapter or
other methods.
1.2 This machine provides analog and digital balanced input card holder. Please connect to the correct signal source according to
relevant regulations. 1
2 +
3 -
Digital power amplifier
MDA-KDM series

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①②
③④ ⑤
⑥
⑦⑧ ⑨
⑩
Note:
① 4.3 inch capacitive touch screen, which can quickly manage input source switching, channel link, network settings, local
information, etc.
② Multi-function button, press or rotate, you can confirm or modify the selected parameters.
③USB interface, use Type-B2.0 cable to connect the power amplifier. (Note: The following systems in WIN7 require manual
installation of drivers. Address: www.marani-proaudio.com)
④ Analog signal input interface. Before connecting to the signal, please ensure that the amplifier is in a mute or minimum volume
state. (Factory default analog input)
⑤ Digital signal input interface. You need to select a digital signal input source in the software.
⑥ TCP/IP network interface, supporting STATIC and DHCP modes, capable of remote control of devices, firmware upgrades, and
more.
⑦Dante network audio interface, support daisy chain connection. https://my.audinate.com/support/downloads/download-latest-dante-
software
⑧⑨A/B/C/D output interface, A/C port is a combined output. +1/-1 is the A/C output channel and +2/-2 is the B/D output channel.
⑩⑪Power input interface and power switch, connected using PowerCON plug, connected to 90-240V 50/60Hz AC power.
⑪
Box Contents:
AMP*1 warranty card*1 Network cable*1 Power Cord*1
Output connection: Use the SpeakON plug to connect. A/C is the
combined output, for example, interface A +1/-1 is the A output
channel, and interface 2/-2 is the B output channel.
Audio Connections:
Panels：
Input connections: Analog signal, Dante (Optional), AES
digital signal. (The input signal line should have an
independent shielding layer to maintain a distance of 50CM or
more from other interference sources)
Digital power amplifier
MDA-KDM series

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Digital power amplifier
MDA-KDM series
Control software connection interfaces:
The MDA-KDM series has two connection interfaces: TCP/IP (recommended) and USB.
TCP/IP connection: use a Category 5/Category 6 network cable to connect the TCP/IP port of the power amplifier to the
network adapter interface of the computer.
The MDA-KDM series supports two IP addressing modes: STATIC addressing or DHCP mode (default). The amplifier
addressing mode has to match the computer network settings. For DHCP mode connections, the IPv4 address option of the
computer network adapter has to be Dynamic (Automatic); on the contrary, when the amplifier is set in STATIC addressing
mode, the computer network card has to use a STATIC (manual) IP address in the same network mask of the amplifier (e.g. if the
amplifier IP is 192.168.0.100 with a Netmask 255.255.255.0, the computer IP should be in the range 192.168.0.XXX).
The amplifier implements an automatic device discovery service, allowing to easily connect the PC control software: it is enough
to open the control software, wait for the discovery message to appear and click OK to connect.
Open software Automatic discovery Connected Device
Common issues with theTCP/IP connection:
1. The automatic discovery message doesn’t appear.
Solution:
Click on the settings icon on the amplifier screen to enter the IP settings page and view the current IP mode of the amplifier. Open
the computer's wired network card network adapter and ensure the IP mode of Internet Protocol Version 4 (TCP/IP v4) matches the
amplifier IP settings, as described above.
If the IP settings of the computer has been properly set and the discovery message still not appear, it can be due to the computer
firewall that filters the broadcast announce messages from the amplifier. To solve the issue, the firewall has to be disabled or a
firewall exception for the control software has to be manually added in the Windows firewall settings (Note: the first time the control
software is run, a firewall exception prompt appear to automatic add the software in the firewall exception list).
2. After opening the software, the software prompts a message like “Found [email protected] (UDID:
437F8D4ACB68) The device is UNREACHABLE! Please check your network settings”. It means the amplifier is correcly
connected to the network, but the IP settings of the computer doesn’t match network settings of the amplifer.
Solution:
Check the computer settings and ensure the network card uses the same addressing mode of the amplifier and, if STATIC mode is
selected, set the IP address of the computer in the amplifier Netmask range.
Network cable connection diagram:
Network cable

USB connection: use a Type-B2.0 cable to connect the computer to the power amplifier and open the control software. Then,
click the Add Device button, choose USB connection and select the right power amplifier model. Finally, Click the “Offline”
label to connect.
Add Device Connected Device Successfully connected
Common issues with the USB connection
The message “Device not found” appears when trying to connect the amplifier.
It means the control software can’t recognize the amplifier, due to a model mismatch or an issue related to the USB COM port driver.
Solution 1: be sure the model of the added device match the amplifier model.
Solution 2: open the computer device manager to check whether the COM port and SUB driver are correctly installed. In the case the
COM port number is greater then 72, manually change it to a free COM port in the range 1...72. If the amplifer USB driver cannot be
properly recognized, please try using another USB port of the computer or reinstall the driver. Download address: www.marani-
proaudio.com (Note: Drivers below WIN7 need to be manually installed)
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Digital power amplifier
MDA-KDM series

The MDA-KDM series power amplifier has a 4.3 inch capacitive touch screen, by which users can easily recall presets, switch input
source, set input gain/mute as well as channels linkage or network settings, and monitor the main amplifier status information.
1.0.Turn on the power switch of the amplifier >>> Data loading
Recall presets >>> You can retrieve presets that have
been saved in the amplifier
Settings menu
Channel Mute and Volume Adjustment
Input and output signal display
Standby Switch
1.1.Power amplifier Home screen
2.0.Settings menu
Channel Source Settings >>> Selectable from Analog, Digital,
Dante, Signal Generator
Channel linkage >>> Supports multi-channel linkage
Network Settings >>> Can view local IP settings information,
supports STATIC and DHCP modes, and can set IP addresses as
needed
Local information >>> You can view the main information of this
device, such as device name, current IP address, firmware version,
etc
Display screen management:
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Software management:
① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨ ⑩ ⑪
①New Project
②Load project Files from a Computer
③Save project files to computer
④Add a device (you can choose USB or TCP/IP connection)
⑤Search for new devices (both for USB and TCP/IP
connections)
⑥Connect all offline devices in the device list
⑦Disconnect all currently connected devices
⑧Set all devices in operational mode (exit standby)
⑨Set all devices in standby mode
⑩Add a group (It can control the Gain, Mute, InputEQ,
Delay of multiple devices at the same time...)
⑪ Level monitoring and mute of all power amplifiers
程
① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨ ⑩
Navigation Bar - At the top of all amplifier user interfaces.
① Recall/Save presets from/to the computer, Store/Recall presets to/from the amplifier and copy channel settings
② Amplifier settings, including LAN, name, group reset, preset recall mode, amplifier gain, user and admin password
③ Firmware upgrade (for TCP/IP connection only)
④ Admin Login: Admin mode has the highest management permissions for the device, which can lock or hide processor data and
functions. Default password: 111111
⑤ User interface lock, panel lock (default password: 000000), device identification, data backup, and data recovery
⑥ Routing interface, which can be directly accessed by clicking on the function module
⑦ Channels level display, level adjustment, mute switches and amplifier status information
⑧ A/B/C/D input channels, click the corresponding number to quickly open the channel processing page.
⑨1/2/3/4 output channel, click the corresponding number to quickly open the channel processing page.
⑩ Standby switch, red on, blue off
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Input source selection and input source hot backup switch:
The MDA-KDM series power amplifiers support analog, digital, and Dante signal inputs. They also support the input
source hot backup function, allowing users to specify backup signals for the primary source. When the autoswitch
function is enabled (“ON”), the amplifier detects any signal loss on the primary (first) source, due for example to a
cable disconnection, and automatically switches to one of the backup sources, following the priority set by the user.
When the primary signal is restored, the system automatically switches back to the primary source. The User can set
the source priority and adjust the level of each source in the “AUTOSWITCH EDIT” window. When the autoswitch
function is disabled the device uses the primary (First) Source.
Note: only the First Source can be selected in the main windows. To select the Second and Third Source the user has to
open the “AUTOSWITCH EDIT” window
Software routing interface：
Input Mute
Gate
Input Gain
Loudness Filter
Input Delay
Input PEQ
Input compressor
FIR
Output Gain
X-OVER
Output Delay
Output PEQ
Output compressor
Output Mute
Output compressor
Output load impedance
selection
Amp
calibration
Note: Click on the corresponding
function module for quick access.
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Noise generator
The noise generator allows to feeds all the input channel with a white or
pink noise. Noise Level can be adjusted within the range 0 ~ -40dBu.
Attention: Before turning on the noise generator, the level should be at the
minimum value (-40dBu) to ensure the safety of the system and on-site
workers.
Signal Routing
The MDA-KDM series power amplifiers have a 4X4 input/output routing matrix (with the exception of the MDA2-
8KDM, that has a 2x2 matrix), allowing users to mix, with a suitable level, any input signal into one or more output
channels. The mixing level can be adjusted within the range 0...-30dB.
It supports any input channel linkage, or A&B / C&D pairs
linkage. Once the links are set, any settings change in the
current channel will be applied on the linked channels too.
It supports any output channel linkage, or 1&2 / 3&4 pairs
linkage. Once the links are set, any settings change in the
current channel will be applied on the linked channels too.
It shows the processing latency of each input/output
channel. Clicking the latency labels of 2 or more channels,
will enable the autolatency function, that allows to
automatically align the selected channel latency.
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Level monitoring interface
The Vu-Meter section shows the level of the inputs (before gain “BG”) and of the outputs (after process “AP”)
The level monitoring interface shows input and output channels level meter, as well as the main amplifier status
information. It also allows to set channels gain and mute.
Input and output channels level can be adjusted within the
range -12dB~+12dB with a 0.1dB step. Double click the
fader’s thumb to quickly return to the 0dB position.
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SPEAKER DRIVE: it shows the current selected load for each output channel.
Power amplifier load status, MDA-KDM series amplifier supports 100V, 70V
constant voltage and 8 Ω, 4 Ω, 2 Ω loads (please refer to the specific amplifier
model parameters for the supported load list).
Note: before unmuting an output channel, please be sure the speaker drive selection
in the routing page matches the current load connected to the amplifier.
TEMPERATURE: it shows the temperature of each output channel, with a
maximum display value of 85℃. When the temperature reaches 85 ℃, the power
amplifier will trigger the temperature protection, and the corresponding channel red
light will turn on. (Please use this device in a well ventilated and heat dissipating
environment, and do not block or cover any air inlet and outlet)
MASTER GAIN: gain acting on all the inputs channel (range -12dB~+12dB).
MASTER VOL: volume acting on all the output channel (range -80dB~0dB).
MASTER MUTE: mute all output channels
Input channel view
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Click to change the PEQ type
PEQ Gain: enter the value
in the textbox and press
Enter to confirm.
PEQ gain: drag the thumb
fader to adjust the value, or
click it and adjust the value
with the arrow keys of the
keyboard
PEQ frequency, enter the value
in the textbox and press Enter
to confirm.
Range 20Hz-20kHz; step 1Hz. Q value can be adjusted by
arrows or typing the value
in the textbox and pressing
Enter to confirm. The Q
range depends on the
selected PEQ type
PEQ Enable or disable
The PEQs can be also adjusted directly in the plot area by cursors. To enable this function click on
the button (the equalizer and PEQ filter has to be enabled to show the corresponding
cursor).
In the plot view, it’s also possible to Zoom In/Out the curves with the buttons,
select the plot type (magnitude or phase) and import an impulse response provided by third party
sw
PEQ
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Channel gain: enter a value
and press Enter to confirm,
or drag the thumb fader, or
select the fader by cliking the
thumb and use the keyboard
arrows to adjust the value.
Gain range: -12dB ~ +12dB
step 0.1dB.
Input channel Vu-Meter. The
user can observe the input
signal in real time. BG
represents the signal before
gain, BC represents the
signal before compressor,
and AP represents the signal
after channel process.
Input channel polarity
switch
Input channel mute switch
Delay adjustment in
millisecond [ms] / meter [m].
Delay range: 0-300.989ms /
0-102.336m.
Step fine: 0.01ms/0.003m.
Dynamic Loudness filter
The dynamic loudness filter boosts the low and high frequencies of an adjustable amount when the
sound pressure level is low, in accord to the human hearing curve. The boost effect automatically
decreases when the signal level approaches the maximum value.
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In the “Noise Gate” frame, the main parameters can be set:
NOISE GATE
The noise gate is the first process in the input signal path. To enable the process, click "OFF"
/ ”ON” button.
Threshold: it represents the signal level below which the noise gate “close” (mute) the input
channel. Once the noise gate is active (gated), an average signal above the threshold (+5dB of
hysteresis) will “open” (unmute) again the input channel.
Available thresholds are: -85dBu, -75dBu, -70dBu, -65dBu, -60dBu, -55dBu
Release Time: it represents the “speed” in exiting the Gated signal condition, when detected a
input signal peak exceeding the Threshold level.
Release times range is from 1ms up to 1sec.
Attack Time: it represents the “speed” in entering the Gated signal condition,
when detected an average input signal peak belowing the Threshold level.
Attack times range is from 1ms up to 1sec.
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Each input channel of MDA-KDM amplifier has 12 PEQs, that can be set as Bell, High-Low shelving,
High-Low pass (Butterworth -12dB/Oct), notch and all-pass (1st/2nd order)
Output Channel View
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Each output channel can be set to use IIR, FIR or MIR Xover mode.
The conventional IIR has the magnitude slope of the analog filter,
but produces a significant phase deviation especially close to the
cutoff frequency. The higher the order, the more the phase shift.
FIR Xover can provide a very sharp magnitude response and linear
phase function, but also brings an high amount of latency depending
from the numbers of the taps used.
To this end, Marani's proprietary MIR filters integrates advantages
of both IIR and FIR based Xover, since they provide the same
magnitude response of the IIR and a linear phase as the FIR, with a
low latency value.
IIR Xover. Four types of IIR filters are available: Butterworth, Linkwitz Riley, Bessel and NXF, with
slopes ranging from -6dB/oct to -75dB/oct.
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MIR Xover. Four types of MIR filters (High and Low pass) are available: Butterworth, Linkwitz
Riley, Bessel and NXF, with slopes ranging from -6dB/oct to -75dB/oct.
FIR Xover. It supports high/low/band pass linear phase
filters and offers a full set of parameters (number of taps,
stop-band attenuation, window type) to customize di filter
generation.
A third-party FIR filter file can also be imported (CSV, TXT
or SAF files are currently supported).
The maximum number of taps for the FIR filter is 512.
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MDA-KDM series

The MDA-KDM provides a low distorsion RMS
compressor on each output channel. It can be used as a
conventional compressor, using the threshold, ratio, knee,
atk/rel times and makeup parameters, but it also offers the
possibility to enable the AUTO compressor mode.
In AUTO mode, the compressor dynamically adjusts the
attack and release time according to the comparison of the
signal Crest Factor and the RMS value within a period of
time. The result is a more natural and smooth sound, rather
than the abrupt feeling caused by constant attack and
release times.
AUTO KNEE and AUTO MAKEUP functions are also
available.
A low distorsion peak limiter is provided with low
attack time to quickly suppress the burst signal.
lt can be used to limit the maximum displacement of
the speaker voice coil in conjunction with the max
voltage data given by the speaker manufacturer.
It can well protect the loudspeaker from harm.
Users can adjust the limiter threshold, attack and
release time.
The output section of the MDA-KDM amplifier provides
8 PEQ filters. Available filter type are: Bell, Hi-Shelving
1st order, Hi-shelving 2nd order, Hi-shelving Q, Lo-
Shelving 1st order, Lo-Shelving 2nd order, Lo-Shelving
Q, Low Pass 1st order, Low Pass 2nd order, Low Pass Q,
High Pass 1st order, High Pass 2nd order, High Pass Q,
Band Pass, Notch, All Pass 1st order, All Pass 2nd order
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Amplifier calibration
The MDA-KDM series includes a powerfull calibration function, allowing to optimize the amplifier response depending
on the current speaker connected to it. It processes a feedback signal at the output power connector and calibrate the
amplifier settings to provide a flat magnitude and linear phase response.
The calibration of the MDA-KDM series amplifier does not require any acoustic microphone or sound card.
Simply connect the amplifier to the speaker and follow the steps below to complete the calibration.
Note: it is recommended to mute any input signal when performing amplifier calibration.
To start the calibration, select the nominal impedance values in the output channel where the speaker is connected. Then,
click the speaker button of the same channel (in the picture below is “GENERIC“) to open the calibration page.
In the calibration view the current speaker library is shown. If the speaker model is already available, it is enough to
select and ASSIGN it to the current output channel. On the contrary the amplifier calibration for the new speaker model
has to be done. Enter the speaker name and click on CALIBRATE AMP button. The calibration process will start.
2
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1111 2

④
During the calibration, the power amplifier will emit a -18dBu sine sweep signal.
⑤
⑥
When the calibration is completed, the system adds the new amp calibration in the speaker library.
After calibration, the user can also verify the amplifier response, by selecting the speaker in the library and
clicking the VERIFY button. A new window will be open. Select the speaker type (FULL-RANGE,
WOOFER, MID-RANGE or TWEETER) and click the “VERIFY” button.
When the verification process completes, the amplifier response is shown, both in magnitude and phase.
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③