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MM-4220T/C
STEREO MIXER + CF RECORDER
FOR PROFESSIONAL USERS

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 for 16-24 bits @ 48 kHz, PPM metering with 2 x 8 multicolor 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 latest version now also offers a highly accurate real-time clock and a time code sync input.

Read the User Report from well-known audio/video technician Eric Spitzer-Marlyn after using MM-4220 for a production with Mr. Werner Herzog.

The front panel holds all controls for the mixer. On top of the panel are toggle switches for Power, Test Tone and Battery Test. Each of the four inputs 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 bass-cut.
On the upper part of the front panel is the PPM bar graph with 16 multicolor LED's covering the range 0 to -50 dBu 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. Recording is uncompressed BWF (Broadcast Wave Format) on FAT32 formatted cards. Recordings are stereo, 24 or 16 bits @ 48 kHz, selectable in setup menu by a PC connected to the USB port, or by front panel switches.

The backside panel holds all sockets for input and output plus external power supply.
There are four input sockets (XLR-3F), for the input channels. Each input has its corresponding toggle switch for enabling 48 V phantom power. There are two sockets (XLR-3M) for the main outputs L and R. A 3.5 mm stereo socket is intended for headphones of most kinds, 32 - 2000 ohms impedance. There is also an AES3id* coaxial output and a USB socket for software updates.

The internal real-time clock uses a very accurate crystal, +- 2 ppm. It can easily jam sync to an external LTC time code signal. Time code is put in the header of the BWF file.

External power supply can be used for prolonged up-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 about 2.5 hours.

*AES3id is a newer standard allowing for transmission of AES3 pro format signal over a 75 ohms coaxial wire at distances up to 1000 meters. It is, in most cases, compatible with both AES/EBU and S/PDIF inputs.

	MM-4220 Stereo Audio Mixer data sheet
	MM-4220 Stereo Audio Mixer manual

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© Copyright 2011
MARENIUS, Sweden

MARENIUS
ELEKTRONIKUTVECKLING AB
P.O. BOX 5086
SE-42605 V FROLUNDA
SWEDEN
Phone +46 31 691610
Fax +46 31 693188
Mail info@marenius.com