6/18/2009
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1. General description
MM-4220 includes:
4 low-noise mic/line inputs
Compact Flash recorder
Re-chargeable batteries
Heavy-duty metal case
Compact size
1 kHz test tone
48V phantom power
AES3-id digital out
LTC time code jam input
A highly accurate crystal oscillator
The MM-4220 is a true professional stereo Mixer for portable use, made by MARENIUS.
It offers four mic/line input channels, built-in Compact Flash card recorder, PPM
metering with
2 x 8 multicolored LED’s, low-noise amplifiers and power supply based on
re-chargeable NiMH cells for up to 8 hours use. All this is housed in a compact, all-metal
heavy-duty case.
The front panel holds all controls for the mixer. On top of the panel are toggle switches for
Power, Test Tone and Battery Test.
48V phantom power may be selected for 0, 2 or 4 inputs.
Each of the four channels has a gain control pot and a pan pot. In addition there is a gain
selector switch for 0, 24 or 48 dB gain. The gain pot adds up to 12 dB and the master pot adds
another 12 dB for a total of 72 dB gain, input-to-output.
There is also a toggle switch for inserting a HP-filter for wind and bass cut.
On the upper part of the front panel is the PPM bar graph with 16 multicolor LED’s covering the
range -50 to 0 dB in optimized step size.
You will also find the master pot and the headphones pot, as well as a switch for selecting 48V
phantom power for 0, 2 or 4 channels.
The CF card slot will accept up to 16 GB cards. Recordings are saved in uncompressed WAV
format on FAT32 formatted cards.
Recordings are stereo, 16-24 bits @ 48 kHz, selectable in setup menu by a PC connected to
the USB port, or by front panel switches during power-up.
The backside panel holds all sockets for inputs, outputs and external power supply.
There are four input sockets (XLR-3F) for the input channels and two sockets (XLR-3M) for the
main outputs L and R.
A 3.5 mm stereo socket is intended for headphones (32 - 2000 ohms impedance).
There is also an
AES3-id
RCA socket output and a USB socket for configuration of the mixer.
External power supply can be used for prolonged working time or when the mixer is used in a
non-portable mode.
The external power should be 18 V @ 1 A.
When powered from internal accumulator, expect a total working time of 6-8 hours, depending
on battery status and temperature.
A high-speed charger function is included for a charging time of about 2.5 hours.
Along with a specially made cable connected to the USB port a LTC time code signal may be
connected for jamming the internal clock to frame accuracy.
