Stereo Audio Mixer MM-4220 T/C | Manual | Version 1.03 T/C 6/18/2009 www.marenius.
Table of contents 1. GENERAL DESCRIPTION 1 2. CONNECTIONS 2 2.1 POWER SUPPLY 2.2 AUDIO INPUTS 2.3 AUDIO OUTPUTS 2.4 PHONES OUTPUT 2.5 DIGITAL OUTPUT 2.6 USB SOCKET 2 2 2 3 3 4 3. USER INSTRUCTIONS 5 3.1 AUDIO MIXER 3.2 AUDIO RECORDER 3.2.1 16 / 24 bits mode selection 3.2.2 Checking recording buffer state 3.3 SETTING THE INTERNAL CLOCK 3.4 TIME CODE SYNCHRONIZATION (JAM) 3.5 POWER SUPPLY 4. TECHNICAL SPECIFICATIONS 6/18/2009 5 6 6 7 7 8 8 9 www.marenius.
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.
2. Connections 2.1 Power supply The 2.1 mm power jack on the back of the unit accepts a clean DC voltage for powering and/or charging. The polarity can be switched without damaging the mixer. Input voltage: 18 VDC Minimum input current: 1000 mA ! Caution: Voltages above the recommended supply voltage can damage the device. 2.2 Audio inputs The mixer has four balanced XLR3 female sockets for mic or line level signals. The pin configuration of the analog inputs is shown in table 2.1. Table 2.
For an unbalanced line level output signal connect in accordance with table 2.4. Table 2.4 Unbalanced analog audio output Connector type Ground Signal Do not connect! XLR Male Pin 1 Pin 2 Pin 3 2.4 Phones output The headphones output is a 3.5 mm 3-pole socket for standard headphones with an impedance equal to 32 - 2000 ohms. Table 2.5 Phones output Connector type Ground Left Right 3.5 mm, 3-pole sleeve tip ring 2.5 Digital output The digital audio output conforms to the AES3-id format.
2.6 USB socket The mixer has a mini-USB socket for connection to a PC for setting the internal real-time clock. This is used for adding a time-stamp to each recording. Instructions for setting the clock are described in chapter 3.3 in this manual. The USB socket is also used for setting 16 or 24 bits recording resolution. 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.
3. User instructions 3.1 Audio Mixer The audio mixer functions are very straight-forward. Connect desired number of microphones and/or line level input signals to the XLR sockets INPUT1 - 4 on the back panel. If required, connect the output signal from the XLR sockets OUTPUT LEFT and RIGHT. If required, connect a headphone to the phones socket. If required connect the digital output to an external unit with a suitable digital input.
3.2 Audio Recorder The Compact Flash Recorder is located close to the left edge of the front panel. Before use a formatted CF card is required. Uses a suitable CF card adapter connected to a PC (or Mac) and format the card according to the FAT32 standard. Any other formats will be useless in MM-4220. Suitable CF cards have a capacity between 2 GB and up. High-speed cards are preferred. For 24 bits recordings this is required.
3.2.2 Checking recording buffer state The recording buffer is an on-board memory that holds enough samples for compensating for the periodically slower CF card. With some CF cards and, in particular, in 24 bits mode there may be risqué for buffer overrun. To see the buffer status, press both keys >> >> and << << while in recording mode. The bar graph will show a low level for a good state and a higher level for buffer problem. In case of buffer overrun recording mode is cancelled. 3.
3.4 Time code synchronization (jam) The internal clock is driven by a highly accurate clock oscillator. It is possible to synchronize the clock with an external LTC time code signal. Note that only hh:mm:ss:ff will be synchronized, yy:mm:dd (year/month/date) will not be affected. Perform the following steps for correct time code synchronization: 1. Follow the steps outlined in 3.3 to enable time code mode and also set the clock to correct date. 2.
4. Technical specifications MM-4220 T/C Frequency range THD Max. gain Signal-to-noise ratio Crosstalk at full pan Equiv. input ref. noise Input sockets Audio input impedance Audio input level max. High-pass filter Output sockets Audio output impedance Audio output level max.
