[Edit: I changed the title of the thread to reflect that we're talking about all current Marenius gear]
Just launched in January 2009, this looks like a contender to the R44 for the smallest 4-channel all-in-one unit.
Cheaper than the SD 744T but more expensive than the R44, the currency slump of the Swedish Krona made it more affordable.
Selling in Sweden for 13600 SEK (excl tax), this translates to $1550, provided you find a way to import it without customs.
The biggest drawback is the bitrate: recordings are restricted to 16/48 only.
Maybe their developers will listen to the market and release a 24bit version later on?
I like the form factor.
Size W x H x D approx. 140 x 60 x 136 mm
Compared to R44:
Dimensions 157(W) x 61(H) x 183(D) mm
Compared to SD 744T:
209 mm x 45 mm x 125 mm (H x W x D)
http://www.marenius.se/products/mm4220.html
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 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 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 8 GB cards. Recording is uncompressed WAV format on FAT32 formatted cards. Recordings are stereo, 16 bits @ 48 kHz, while the internal A/D and D/A converters use 24 bits for higher precision. You will then be sure to get a full 16 bits resolution onto the CF card.
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.
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.
Technical Data
Frequency range 25 Hz -22 KHz (-3 dB)
THD <0,004% @ 1 kHz, +12 dBu
Max. gain 72 dB (48+12+12)
Signal-to-noise ratio >94 dB @ 0 dB gain, A-weighted
Crosstalk at full pan <-50 dB
Equiv. input ref. noise <-122 dBu, A-weighted @ max gain
Input sockets XLR-3F
Audio input impedance 2 K ohms(mic), 20 K ohms(line)
Audio input level max. +12 dBu
Output sockets XLR-3M
Audio output impedance 2 x 100 ohms balanced
Audio output level max. +12 dBm (600 ohms)
Phones socket 3.5 mm 3-pole
Phones output 2.0 Vrms into 300 ohms
Phones impedance 32 - 2000 ohms
Test tone 1000 Hz +/-0,001% @ -12 dBFS
Phantom power 48 V+-6 V, max 5 mA @ 90%
Power supply: internal NiMH
or ext. 18 V DC @ 1 A
Current drain <220 mA
Charge current 650 mA
Size W x H x D approx. 140 x 60 x 136 mm
excl. sockets and knobs
Weight approx. 950 grams
Carrying case: optional