MX422 Field Mixer - Rolls Corporation
Contents
1. www rolls com 62. R316 10K RIS R216 10K R115 R116 g 10K R415 10K 9 R313 UF 10K P100K 40K P10 P100K P100K P100K a P9 H B R311 51 R306 10K 40K G R29 18K vec Q2 MPSA05 SWI3B yy 5 Kt LORR 4 LDRR www rolls com 10 HEADPHONE EARPHONE MONITORING PLEASE NOTE The MX422 has very loud headphone and earphone circuitry Be sure to turn down the Phones level control before selecting the Source and putting your headphones or earphones on to prevent accidental hearing damage HEADPHONE EARPHONE SOURCE SELECT When monitoring for recording you typically will listen to the signal from the Main Outputs Leave the SOURCE button in the out position to monitor the Main Output signal Occasionally you ll need to listen to an alternate signal i e a remote truck or record ing engineer Their signal is generally connected to the Monitor Input jack Press in the SOURCE button to listen to the signal on the Monitor Input OUTPUTS The MX422 is a two bus mixer with two individual balanced male XLR output jacks Each output is isolated providing excellent signal connectivity and noise performance These outputs are generally connected to a recording device or other input looking for a line l
3. Auxiliary Input Switchable 48 Volt Phantom Power for each input Switchable 100 Hz Low Cut filters for each input Two sets of battery compartments never lose power Level and Pan controls for each channel Built in Limiter with variable Threshold control 20 Hz Slate tone with Slate Microphone included Switchable 1 kHz setup Tone Calibrated VU meters 1 4 and 1 8 3 5mm Headphone Earphone Outputs with selectable Source Input Main mix buss or Monitor input and Level control Canvas case included 6 hour battery life with 2 condenser mics using phantom power and head phones attached constant use Rolls PS27 external power supply included SPECIFICATIONS Input Impedance Mic 10K Ohms XLR balanced Source 22K Ohms RCA Limiter Threshold 5 dB to off fully clockwise No Limiting Setup Frequency 1 kHz Slate Frequency 20Hz Output Attenuator 30 dB Self Noise 57 dB maximum 90 cB typical Max Gain 65 db S N Ratio 115 dB THD 05 Frequency Response 20 Hz 30 kHz 0 3 dB Low Cut 100 Hz Trim Range Oto 38 dB Max Input 0 dBV Current Draw 45 mA with no Phantom Power or Signal Phantom Power 48 VDC Typical Batery Life 6 Hrs 2 mics phan on 1 headphone Connectors 4 ea Female XLR 2 ea Male XLR 3 ea 1 4 1 ea 1 8 3 5mm 1 Center Negative power jack Power VDC 200 mA min Size 9 5 W x 7 25 D x 2 375 H Weight 4 Ibs www rolls com 2 QUICK START GUIDE For tho
4. Output when it is pressed IN the sound heard will be that of the Monitor Input HEADPHONE EARPHONE OUTPUTS 1 4 Tip Ring Sleeve and 1 8 3 5 mm Tip Ring Sleeve jacks containing either the Main Output signal or Monitor Output signal depending on the setting of the Headphone Source Select Switch www rolls com 4 DESCRIPTION CONT REAR PANEL MONITOR LEFT INPUT INPUT INPUT INPUT INPUT OUTPUT QUIPUT INPUT LJ POWER ROLLS 30 pia phan lowcut phan lowcut MODEL MX422 LINE EN c m NUMBER n pur gt VDC Power input connector Connects to the optional Rolls PS27s Power Adapter POWER Button turns the MX422 on and off MONITOR INPUT 1 4 Tip Ring Sleeve jack for connection to a stereo signal source to be monitored This signal connects directly to the Phone Level control and the Head phone Outputs LEFT RIGHT OUTPUT Balanced XLR jacks containing the main mix signal Pin 2 is con figured hot pin 3 is neutral and pin 1 is conntected to chassis ground OUTPUT LEVEL 30 dB LINE When pressed in this button pads the Output signal by 30 dB BATTERY SELECT This switch selects which set of battery compartments are being used When the switch is to the left the left side with the back panel facing you battery compatments are being used When the switch is to the right the right side battery compartments are being used AUX INPUT 1 4 Tip Ring Sleeve jack for connection to an auxiliary line level stereo sig
5. Tone oscillator is set to output a 1 kHz sine wave to the Main Right and Left outputs with the Output Level switch set in the out or LINE position Note this tone is also sent to the Headphone outputs when the Headphone SOURCE button is in the MAIN position It would be a good idea to remove your head phones or earphones when the Tone button is pressed in When levels are set press the Tone button again to disengage the Tone oscillator www rolls com 8 OPERATION INPUT CHANNELS The inputs to the MX422 consist of four full featured microphone preamplifiers Each channel has a wide gain range to accommodate nearly all signal types The unit accepts signals ranging from low sensitivity ribbon and dynamic microphones to me dium level wireless and condenser mic outputs up to the hot line levels The MX422 input channels can be used as wither balanced or unbalanced connec tions When unbalancing ground pin 3 to pin 1 There is no change in gain between unbalanced and balanced connections into the MX422 The AUX INPUT jack is provided for recording stereo sources such as CD players MP3 players DVD etc TRIM CONTROL Like traditional mixing consoles the MX422 microphone preamp gains are set via the trim control This control adjusts the input sensitivity of the channel input so that the channel fader can be set to operate in a usable range Once set the trim is typically kept at the set level and all mixing is done on the channel
6. front panel Level control INDIVIDUAL CHANNEL LEVEL CONTROLS While both the trim and channel Level controls adjust the gain of a given channel the Level is the primary channel volume control The trim can be thought of as a course gain adjustment to be adjusted during setup and the Level control is a fine gain adjustment used while recording With a properly set up trim control the Level can be set to a nominal level around 12 O clock providing the maximum amount of variance and headroom PHANTOM POWERING The MX422 can provide up to 10 mA of current to each input at 48 Volts sufficient for the most power hungry condenser microphones The MX422 Phantom Power utilizes a fixed 48 Volts DC which is resistively applied to pin 2 and pin 3 of an XLR input con nector relative to pin 1 there is no voltage difference between the signal on pins 2 and 3 a dynamic microphone may or may not operate normally in the presence of phantom power It is generally a good practice to turn off phantom powering when not using a con denser microphone as it can capacitively couple noise into the mic inputs with poor mic cables Also be sure to turn off phantom powering when using ribbon micro phones since an improperly wired cable can permanently damage the microphone LOW CUT FILTERS Each channel of the MX422 features a switchable Low Cut filter set at 100Hz These Low Cut sometimes called High Pass filters are useful for removing exc
7. 6 MX422 Field Mixer 75889 00422 MX422 Field Mixer PHONES right wang n MONITOR SOURCE THRESH TONE aC ED D riero wixen ROLLS trim trim trim trim MONITOR LI INPUT INPUT INPUT INPUT Gal RIGHT AUX INPUT OUTPUT OUTPUT INPUT u u t u POWER E phan lowcut phan lowcut phan lowcut phan lowcut MODEL MX422 rt r SERIAL NUMBER 4 3 2 1 Er IX c NOTE THIS MANUAL ASSUMES THE USER HAS A WORKING KNOWLEDGE OF AUDIO ELEC TRONICS BALANCED AND UNBALANCED CONNECTIONS AND PROPER SIGNAL LEVEL SETTINGS ROLLS ROLLS CORPORATION SALT LAKE CITY UTAH 4 12 Quick Start Guide INTRODUCTION Thank your for your purchase of the Rolls MX422 Field Mixer Professional ENG mixer Please read and review this manual carefully as it contains important information regarding the proper use and care of the MX422 INSPECTION 1 Unpack and inspect the MX422 box and package If obvious physical damage is noticed contact the carrier immediately to make a damage claim We suggest saving the shipping carton and packing materials for safely transporting the unit in the future 2 Please visit our website at www rolls com and click on the Register Your Warranty Here button or complete the Warranty Registration Card and return it to the factory TABLE OF CONTENTS Introduction 1 Inspection Table of Contents Hearing Safety Warnings Features 2 Specifications Quick Start Guide 3 Descripti
8. ceiving signal from the MX422 HEADPHONE MONITORING 1 Connect stereo headphones or earphones to the HEADPHONE outputs on the front panel NOTE THESE MUST BE STEREO HEADPHONES OR EARPHONES USING MONO PHONES WILL DAMAGE THE MX422 2 Select the Phones signal SOURCE monitor either the Main signal switch out or Monitor Input switch in 3 Set the PHONES level to 0 4 Verify signal in the phones by slowly bringing up the PHONES level control 5 Set the PHONES level control for a comfortable level METERING 1 View the Main RIGHT and LEFT output signal levels on the ref 4 dB VU meters 2 To check the available battery voltage press the BATT TEST button LIMITING 1 For no limiting at all turn the LIMITER THRESH control completely clockwise 2 To set a limiting point send signal through the MX422 and slowly turn the LIMITER THRESH control counter clockwise until the desired amount of limiting is acheived 3 www rolls com PAN CONTROL The Pan control routes an input channel signal anywhere between the Left and Right outputs The MX422 uses constant loudness pan controls meaning that the signal is 3 dB louder at the full right or full left position relative to the center position Usually the channel is either panned full left full right or center The pan potentiometer has a detent in the center position for easy location and it is calibrated for a maximum difference of 0 1 dB between the left and right output in
9. ess low frequency energy in audio signals Wind noise is a common unwanted low frequency signal and a low cut filter is effective for reducing wind noise For several audio ap plications engaging the Low Cut filter is beneficial since little usable audio information exists below 100 Hz especially for speech recording T www rolls com DESCRIPTION FRONT PANEL PHONES right wing BATT MONITOR TEST THRESH TONE revomixer ROLLS GD GD GD GB LEVEL 1 2 3 and 4 Adjust the level of signal from the corresponding Mic Input PAN 1 2 3 and 4 Adjusts the relative Right Left signal level to the mix bus SLATE MIC When the Slate Button is pressed and held in the sound at this microphone is sent to the main outputs along with a 20Hz sine wave signal SLATE BUTTON Engages the Slate Mic COMP THRESH Sets the level at which the compressor will compress or lower the signal level 1 kHz TONE When pressed this button sends a 1 kHz signal to the main outputs BATT TEST When pressed this button will indicate the approximate battery voltage on the VU meters Proper battery voltage will be indicated with the meters moving to the red region of the field If the meters are below the red region battery replacement is necessary HEADPHONE LEVEL Adjusts the level of signal from the Headphone Outputs HEADPHONE SOURCE SELECT SWITCH When this button is OUT the sound heard at the Headphone Outputs will be that of the Main
10. evel signal In the event you need to connect the MX422 output to a mixer s Mi crophone Input press in the Output Level select switch to 30 dB This way the MX422 output is attenuated by 30 dB and will be more compatible with an input looking for a microphone level signal MASTER LEVEL CONTROL The front panel Master Level control adjusts the overall output level of the Left and Right outputs The gain range of the Master Level is from complete attenuation no output signal to 12 dB of gain Ideally the Master Level should be set as close to the detent as possible providing you with the maximum amount of variance and head room POWERING The MX422 features a unique and useful battery scheme Two separate battery com partments have been provided on each side of the unit In the event of battery voltage loss during recording the rear panel BATTERY SELECT switch may be moved to the other position to select the second set of batteries This is achieved without any signal loss We recommend using 9V alkaline type batteries however Lithium or NiMH batteries work as well To check the status of the selected battery set press and hold the front panel BATT TEST button For AC power Rolls provides the model PS27s VDC supply to power the MX422 9 www rolls com FEATURES Four servo balanced XLR Inputs Two transformer balanced XLR Outputs Switchable Output Level Line level or 30 dB pad 1 4 TRS Stereo Monitor Input and
11. nal such as the output of another mixer AM FM tuner CD player etc INPUTS 1 4 Balanced XLR jacks for connection to dynamic or condenser microphones or to a balanced line level signal TRIM Adjusts the input signal gain to the corresponding channel PHAN 1 4 When pressed in this button applies 48 volts of phantom power to the cor responding Input LOW CUT 1 4 When pressed in this button reduces the low frequency 100Hz and below of the corresponding Input signal r s S _ 5 www rolls com CONNECTION Zf To recorder or another mixer input Connect to the Rolls Z PS27 Power Adapter REAR PANEL CONNECTIONS Connect your microphones to the MX422 using balanced XLR cables Connect the MX422 Outputs to the next device in your signal chain usually a recording device of some kind also via balanced XLR cables For monitoring external signal Tis input does nat sources connect a stereo eris ay m Tip Ring Sleeve plug to the monitoring on source such as another mie Connect to a mixer AMIFM tuner etc Monitor Input talkback for example FRONT PANEL CONNECTIONS Connect your headphones or earphones to the MX422 front panel as shown below IMPORTANT NOTICE DO NOT PLUG MONO Tip Sleeve PLUGS INTO EITHER PHONES JACK DOING SO WILL DAMAGE THE MX422 Carefully adjust the Phones Level control for a comfortable listening level
12. on Front Panel 4 Rear Panel 5 Connection 6 Rear Panel Connections Front Panel Connections Operation 7 Schematic 10 HEARING SAFETY WARNINGS While special attention has been given to your safety and hearing protection the operator determines proper and safe operating levels Please note the following Always turn down the PHONES level control before plugging in your headphones Always operate your headphones at the lowest practical level Be especially cautious in unknown or widely varying environments 1 www rolls com SCHEMATIC pee W SPST 1 INSTT ATE TONE amp MIC SW15 RIGHT OUT LEFT OUT LR JACK M J H 9 PIN 2 HOT 5 ice uias swa R41 470 DPDT o RIS 10K wit SW SPST D 1 n 3 orrectness of this drawing Sheet 1 of 1 cz t Js T o DB pigs C37 PMB pipok x2 SW10A DPDT R23 10K R51 10 VILSCS ng u12 1 vec R34 1K 1NS2428 N IW 2N3904 2 Q4 THRESHOLD P15 AUXIN urs P100K PHONE 1 4 OTHR 1 2 OF PHAN SW N J8 D6 rt 42 4TU 15 R3 22K 10K ok R314 10K
13. se familiar with ENG or field mixers this guide highlights basic functionality to begin operating your MX422 POWERING To power the MX422 and get it ready for operation 1 Insert four 9 Volt alkaline batteries into the battery compartments Insert with the correct polarity NOTE Only one pair of batteries is being used at a time The other pair is a backup More on that later 2 Or connect external DC power the Rolls PS27s VDC to the MX422 DC Input connector 3 Press in the POWER button 4 Check battery life by pressing the BATT button INPUT CHANNEL SETUP To set up a gain level for an input channel 1 Connect a signal source microphone or line level signal to a channel input connector 2 Set the rear panel trim control at the 12 O clock position this is just a starting point 3 If you re using a condenser microphone activate the Phantom Power by pressing in the phan button 4 Set the LEVEL Control at the 12 O clock position again just a starting point 5 Set the channel PAN control for the desired signal position in the stereo field 6 Press in the rear panel low cut switch if needed 7 Verify there is signal present on the output meter s OUTPUT CONNECTION To connect to the MX422 main Outputs 1 Connect an XLR cable to the LEFT and RIGHT Outputs of the MX422 2 Set the output level switch to either LINE switch out or 30 dB switch in 3 Verify that the next device in the signal chain is re
14. this position LIMITER The MX422 Limiter acts as a safety limiter During normal operation with a properly set gain structure the threshold of the limiter will not be reached If extremely high in put signal levels exist such as in high SPL environments or with misadjusted settings the limiter will activate to prevent the channel from clipping Without a limiter high signal conditions would overload the channel and cause distortion Adjust the LIMITER THRESH control to a point above your normal operating levels but safely below levels causing distortion or pegging of the VU meters METERING The MX422 features two calibrated backlit VU meters VU Volume Units meter ballis tics correspond closely to how the human ear perceives loudness and provides a good visual indication of how loud a signal will be The attack and decay of the meter signal is 300 mS The indicated level on the meters is referenced to 4 dB SLATE TONE AND MICROPHONE The Slate Tone and Microphone circuit is used to notate scenes at the mixer location The Slate circuit uses the front panel momentary button When this button is pressed a 20Hz tone is sent to the Main Outputs and the Slate Microphone becomes active When notating a scene press and hold the Slate button speak into the four holed Slate microphone and release 1kHz TONE This oscillator is provided to set the gain structure between the MX422 and the next device in your signal chain The
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