User’s Guide MVC 121 Mic/Line Mixer and Volume Controller 68-793-01 Rev.
Precautions Safety Instructions • English This symbol is intended to alert the user of important operating and maintenance (servicing) instructions in the literature provided with the equipment. This symbol is intended to alert the user of the presence of uninsulated dangerous voltage within the product's enclosure that may present a risk of electric shock. Caution Read Instructions • Read and understand all safety and operating instructions before using the equipment.
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Quick Start Guide — MVC 121 Step 1 Disconnect all power prior to installing the MVC 121. Step 2 Mount the MVC (if applicable) or affix the rubber feet to the bottom of the MVC for tabletop use. The MVC can be mounted in a rack shelf, under furniture, or to a projector mount. See chapter 2, “Installation and Operation”, for details.
Quick Start Guide — MVC 121, cont’d Step 3 Attach the cables and set the DIP switches. 4 6 MVC 121 MAIN 3 FIXED INPUTS 12V 0.5A MAX LINE 48V LEVEL POWER L R L MIC 2 L R ON ON MIC 1 MIC 1 2 3 VARIABLE 1 2 Tx Rx 3 MUTE 5 7 1 2 3 8 Power connector — Connect the 12 VDC external power supply. CAUTION 2 RS-232 4 1 2 1 2 OFF 1 R OUTPUTS MIXER/VOLUME CONTROLLER When connecting the power supply, voltage polarity is extremely important.
5 Variable output connector — The balanced/unbalanced stereo output is controlled by the Master volume control knob on the front panel. 6 Fixed output connector — The balanced/unbalanced stereo output is set at a fixed level for input to a recording device. Signal level can be adjusted at the recording device. 7 RS-232 connector — Connect an RS-232 device (control system or PC) for two-way RS-232 communication. 8 Mute connector — Connect a contact closure device to mute the inputs.
Quick Start Guide — MVC 121, cont’d QS-4 MVC 121 • Quick Start Guide
Table of Contents Chapter 1 • Introduction .......................................................... 1-1 About the MVC 121 ............................................................... 1-2 Features ...................................................................................... 1-2 Chapter 2 • Installation and Operation .......................... 2-1 Mounting the MVC 121 ....................................................... 2-2 Tabletop use .......................................................
Table of Contents, cont’d All trademarks mentioned in this manual are the properties of their respective owners. 68-793-01 Rev.
MVC 121 Mic/Line Mixer 1 Chapter One Introduction About the MVC 121 Features
Introduction About the MVC 121 The Extron MVC 121 is an audio mixer and volume controller in the Extron VersaTools™ product line that mixes up to two mic inputs (mono, balanced/unbalanced) with one main line level input (stereo, balanced/unbalanced). Each mic input and the main line level input have their own gain control knobs, and the mixed output also features a volume control knob. Volume adjustment interval varies with the speed of knob rotation, i.e.
MVC 121 Mic/Line Mixer 2 Chapter Two Installation and Operation Mounting the MVC 121 Application Diagram Rear Panel Features and Cabling Front Panel Features
Installation and Operation Mounting the MVC 121 The one rack unit high, quarter rack wide MVC can be set on a table, mounted on a rack shelf, mounted under a desk or tabletop, or mounted on a projector bracket. Tabletop use Each MVC comes with rubber feet (not installed). For tabletop use, attach a self-adhesive rubber foot to each corner of the bottom of the unit. UL rack mounting guidelines The following Underwriters Laboratories (UL) guidelines pertain to the safe installation of the MVC 121 in a rack.
Rack mounting For optional rack mounting, do not install the rubber feet. Mount the MVC on a VersaTools® 19" 1U rack shelf (Extron RSF 123, part #60-190-20; Extron RSB 123, part #60-604-20), or a standard Universal 1U or Basic rack shelf (Extron RSU 129, part #60-190-01; Extron RSB 129 or #60-604-01). On the standard rack shelf, the MVC mounts in one of four locations to the rear of the rack or in one of four locations to the front of the rack. 1.
Installation and Operation, cont’d AUT O SW ICH MO DE 1 NO RM AL DIS 2 AU TO TR IBU VOL 3 TIO N AM PL IFI ER 4 A/V SW ITC HE R MI C 1 MI C 2 MA IN 3 MA MI XE R/V OL UM E CO ST NT ER RO LL ER DIS MD A IBU SE R TIO N AM IES TR PL IFIER Mounting the MVC on a standard 1U rack shelf 3. Install blank panel(s) or other unit(s) on the rack shelf.
VOL MIC 1 MIC 2 MA IN 3 MA ST ER MIX ER /VO LU ME CO NT RO LL ER Mounting the MVC to furniture 7a. Slide the MVC slightly forward or back, then tighten all four screws to secure the MVC in place. Projector mounting 3b. Secure the MVC to a projector mount or other surface by inserting the mounting bolt through the bracket’s slotted hole, as shown below. PMK 100 Mounting Bolt 1 2 ON 3 1 2 1 2 LINE MIC MVC 121 4 ON OFF INPUTS 48V MIXER/VOLUME CONTROLLER POWER 12V 0.
Installation and Operation, cont’d Application Diagram OTE REM 6AV SW S B PUT L OUT R R A L 6 R L 5 R L UTS L INP R 4 R 3 L C SYN S PUT OUT 2 R L IN A B 1 R L OUT D UTS INP 3 4 0.3A LISTE 1T23 I.T.E. US C 1 2 40V 100-2 Extron SW 6AV 5 6 Hz 50-60 Audio Recorder Switcher Extron MVC 121 R ED FIX L L 121 ME MVC VOLU R/ ER LEVEL IN MIXE ROLL NT CO WER POV 12 MAX 0.
Rear Panel Features and Cabling 4 6 MVC 121 MAIN 3 FIXED INPUTS 12V 0.5A MAX LINE R L MIC 2 L L 48V LEVEL POWER R ON ON MIC 1 MIC 1 2 3 VARIABLE R OUTPUTS MIXER/VOLUME CONTROLLER 1 2 1 2 OFF 1 2 RS-232 MUTE 4 Tx Rx 3 5 7 1 2 3 8 Power connector — Connect the included 12 VDC external power supply into the 2-pole 3.5 mm captive screw connector. Be careful to observe the correct polarity.
Installation and Operation, cont’d Use the supplied tie-wrap to strap the power cord to the extended tail of the connector. Your MVC 121 may have shipped with a blue captive screw connector. This blue connector can be plugged into either a blue or an orange power receptacle. The ideal length of exposed (stripped) copper wire for the blue connector is 3/16" (5 mm). The blue connector does not have the extended tail or the included tie-wrap.
Never set an unbalanced dynamic microphone to 48V, doing so may damage the microphone. For condenser mics, verify that the mic will safely operate at 48 VDC. CAUTION 3 Mic 1 and Mic 2 input connector — Up to two mono microphones, balanced and/or unbalanced, may be connected to this 5-pole 3.5 mm captive screw connector. See the following diagram. Mic inputs will be evenly mixed into both left and right outputs.
Installation and Operation, cont’d R Balanced Input Unbalanced Input 5 R L Tip Sleeve Tip Ring Sleeve (s) Tip Ring L Tip Sleeve Variable output connector — The balanced/unbalanced stereo output to an amplifier from the 5-pole 3.5 mm captive screw connector (see the diagrams below) is controlled by the Master volume control knob on the front panel (see “Front Panel Features” in this chapter). Adjust the speaker volume by using the following sequence: 1.
6 Fixed output connector — The balanced/unbalanced stereo output from this 5-pole 3.5 mm captive screw FIXED connector is output at a fixed volume level for input to a recording device. Volume level can R L be adjusted at the recording device. The Master volume control knob on the front panel operates independently from the fixed output. The Fixed output connector is wired the same as the Variable output connector.
Installation and Operation, cont’d VOL Front Panel Features MIC 1 MIC 2 MAIN 3 MASTER 1 MVC 121 MIXER/VOLUME CONTROLLER 2 1 3 4 5 All front panel control knobs are speed sensitive. Turn the knob quickly to make coarse gain/volume adjustments or slowly to make fine adjustments. When the Mic 1, Mic 2, and Main 3 maximum gain setting is reached (+12 dB), the top LED flashes three times.
The gain level is indicated by the Gain/Volume level LEDs (see 1 ). 3 Mic 2 input volume control and on/off status LED — Turning the knob clockwise increases the gain setting, and turning the knob counterclockwise decreases the volume setting. The on/off LED indicator lights whenever Mic 2 is on or not muted, but the LED goes off after the minimum volume setting has been reached. The gain level is indicated by the Gain/Volume level LEDs (see 1 ).
Installation and Operation, cont’d On/off status LEDs If no adjustment of the front panel has occurred for 5 seconds, the Gain/Volume level LEDs goes off. All the on/off status LEDs next to each knob are active to indicate the current setting (LED on indicates that the channel is on, LED off indicates that the channel is muted or off). Mute/unmute channel A channel that has been muted by an SIS command can be unmuted by turning the front panel knob clockwise.
MVC 121 Mic/Line Mixer 3 Chapter Three Remote Control RS-232 Programmer’s Guide Windows-based Program Control Contact Closure Mute
Remote Control RS-232 Programmer’s Guide The MVC 121 can be remotely controlled via a host computer attached to the rear panel’s 3-pole captive screw RS-232 connector. The protocol is 9600 baud, 1 stop bit, no parity, and no flow control. RS-232 Tx Rx The RS-232 control device (host) can use either Extron’s Simple Instruction Set (SIS) commands or the graphical control program for Windows. Windows control software is included with the MVC.
is invalid or it contains invalid parameters, it returns an error response to the host.
Remote Control, cont’d = Input or output to be adjusted (1 – 4) 1 = mic 1 2 = mic 2 3 = main line level 4 = master output = On/off status 0 = off (mute) 1 = on (unmute) 2 = mute by contact closure = Input audio gain/attenuation value ( -79 through +12) = Audio gain (per input) (0 – 12) = Audio attenuation (per input) (1 through 79) = Controller firmware version (listed to two decimal places, i.e., x.
MVC 121 • Remote Control 3-5 ASCII Command Response X3 Out4* X3 X3 In X2 * X3 Set output to X3 where X3 = 0/off or 1/on. Show the status X3 of master output where the status is 0/off or 1/on. Set input X2 to X3 where X3 = 0/off, 1/on, 2/ mute by contact closure. An input, while muted by contact closure, is not affected by SIS commands or front panel operations. See Note below. Show the status X3 of input X2 where the status is 0/off or 1/on or 2/mute by contact closure.
3-6 ASCII Command Response (host to controller) (controller to host) MVC 121 • Remote Control N/n Vol X1 60-572-01 X9 X8 Exe X8 X1 Vol X1 Vol X1 In X2 •Gain X4 In X2 •Gain X4 In X2 •Gain X4 In X2 •Gain X4 X4 G g X2 +G/g X2 G/g X2 -G/g X2 * X6 X2 * X5 X4 . Increment the gain of input X2 in 1 dB steps. Decrement the gain of input X2 in 1 dB steps. Show the gain X4 of input X2 . Set the gain of input X2 to X4 . Set the attenuation of input X2 to Show the MVC 121 part number.
MVC 121 • Remote Control 3-7 ASCII Command Response Esc Upload Go UPL (host to controller) (controller to host) See Note below. See Note below. Additional description Esc ZXXX Q/q Zpx X7 .. .. Vol 51 Vol 51 Vol 52 Vol 52 Vol 53 51.0 51.5 52.0 52.5 53.0 .. .. SIS Message to Host .. .. Volume Change .. .. Note: factory default should be as follows: Master output volume: X1 = 50 (-30 dB). All input volume: X5 = 0 dB. Show the MVC’s firmware version.
3-8 View volume range lower limit View volume range upper limit View volume range limit Set volume range lower limit Set volume range upper limit Set volume range limit Command ASCII Command Response X1 X1 4*21# 4*22# 4* 4* *21# *22# X1 X1 Vll4 * Vul4 * X1 X1 (host to controller) (controller to host) Show the volume range lower limit Show the volume range upper limit Set the volume range lower limit to Set the volume range upper limit to Additional description X1 . X1 . X1 . X1 .
Windows-based Program Control The Extron Audio Products Control Program is compatible with Windows 2000 and Windows XP, and provides remote control of the input gain/attentuation, output volume output adjustment, and other features. Updates to this program can be downloaded from the Extron Web site (http://www.extron.com). Installing the software The program is contained on the EXtron Software Products CDROM, disk B. Install the software as follows: 1. Insert the CD-ROM into the drive 2.
Remote Control, cont’d Using the software To run the software: 1. Double click the Audio Products Control Program icon in the Extron Electronics program group. 2. Click the comm port that is connected to the unit’s remote connector. 3. Click OK. The Audio Products Control Program main window displays the input gain/attenuation settings for each channel and allows the user to adjust them. The user can also adjust the volume setting for the output channel.
From the Master output volume range indicator, set the upper and lower range limits by moving the arrowhead indicators. After setting the limits, the output volume can only be set within the specified range limits, as shown below.
Remote Control, cont’d Using the help system For information about program features, you can access the help program in any of the following ways: 32 • From the Extron Electronics program group, double-click the Audio Products Help icon. MUTE 1 2 3 • From within the Audio Products Control program, click Help on the task bar. • From within the Audio Products Control program, press the F1 key. Updating the firmware Firmware updates will be available on the Extron Web site.
Contact Closure Mute For contact closure mute, connect a contact closure remote control device to the rear panel’s female 6-pole captive screw connector. The pin assignments for the MVC’s contact closure mute connector are shown in the following table.
Remote Control, cont’d 3-14 MVC 121 • Remote Control
MVC 121 Mic/Line Mixer A Appendix Specifications, Part Numbers, and Accessories Specifications Included Parts Optional Accessories
Specifications, Parts, and Accessories Specifications Audio Gain from mic input to both fixed and variable outputs at default settings Mic DIP switch = line level .......... Unbalanced output: +20 dB; balanced output: +26 dB Mic DIP switch = mic level .......... Unbalanced output: +50 dB; balanced output: +56 dB Gain from main input to both fixed and variable outputs at default settings Unbalanced output: 0 dB; balanced output: +6 dB Master volume range ..................
Input level sensitivity (mic inputs) DIP switch = line level ..... -42 dBV (8 mV) for nominal output DIP switch = mic level ..... -72 dBV (0.25 mV) for nominal output Input level sensitivity (main input) -22 dBV (79 mV) for nominal output N 0 dBu = 0.775 Vrms, 0 dBV = 1 Vrms, 0 dBV H” 2 dBu Audio output Number/signal type ................... Connectors ................................... Impedance .................................... Gain error ..................................... Nominal level ........
Specifications, Parts, and Accessories, cont’d Rack mount ...................... Yes, with optional 1U, 9.5" deep rack shelf (RSU 129, #60-190-01; RSB 129, 60-604-01); 1U, 6" deep rack shelf (RSU 126, #60-19010; RSB 126, 60-604-10); or VersaTools® 1U, 3.5" deep rack shelf (RSF 123, #60-190-20; RSB 123, 60-604-20) Furniture mount .............. Yes, with optional VersaTools mini underdesk mounting kit, part #70-212-01 (MBU 123) Pole mount .......................
Included Parts These items are included in each order for an MVC 121: Included parts Replacement part number MVC 121 60-572-01 3.5 mm, 5-pole captive screw connectors (4) 10-319-10 3.5 mm, 2-pole captive screw connector 10-319-15 3.
Specifications, Parts, and Accessories, cont’d MVC 121 • Specifications, Parts, Accessories
Extron’s Warranty Extron Electronics warrants this product against defects in materials and workmanship for a period of three years from the date of purchase.
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