Field Mixer CH. 1 CH. 2 CH. 3 CH. 4 MASTER HEADPHONE MX442 3 10 MIC VU 0 10 LEVEL 0 10 LEVEL 0 10 LEVEL 0 3 10 VU 10 LEVEL 0 10 LEVEL 0 10 LEVEL R PAN L R PAN L R PAN L R PAN L POWER MX442 400 Hz TONE SLATE + - OWNERS MANUAL Thank you for your purchase of the Rolls MX442 Field Mixer. The MX442 is a breakthrough in price/performance for the broadcast engineer, remote sound engineer etc. This unit was researched and devoloped by industry professionals. You told us what you wanted, and we built it. Please read through the following manual to ensure proper operation of this unit. FEATURES · Large calibrated VU meters for easy monitoring in any light · +48 volt phantom power on each input · Panning · Slate Mic with a 20Hz tone · 400Hz setup tone · Low Cut switches · Trim controls on each channel · Uses 2: 9-volt batteries or 12-volt ac adapter · 5-position Headphone Monitor switch · Battery test switch and indication on meters · Remote mix input · Low or high level output (-25 or +4 dB) · Mono or stereo operation · Built-in adjustable limiter INSPECTION 1. Unpack and inspect the MX442 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 complete the Warranty Registration Card and return it to the factory. TABLE OF CONTENTS Introduction ................................................................................................................................ 1 Features ................................................................................................................................ Inspection ................................................................................................................................ Description ................................................................................................................................ 2 Front Panel ................................................................................................................... Left Panel ................................................................................................................... Right Panel ........................................................................................................................ Rear Panel ........................................................................................................................ 3 Connection Operation Specifications Schematic ................................................................................................................... 3 ................................................................................................................... 3 - 4 ........................................................................................................... ........................................................................................................... 4 4 Rear Cover Block Diagram and Warranty ..................................................................................................... 1 DESCRIPTION FRONT PANEL CH. 1 CH. 2 CH. 3 CH. 4 MASTER HEADPHONE 3 10 3 10 MIC VU VU 0 10 LEVEL 0 10 LEVEL 0 10 LEVEL 0 10 LEVEL 0 10 LEVEL 0 10 LEVEL LEFT RIGHT R PAN L R PAN L R PAN L R PAN L POWER MX442 400 Hz TONE FIELD MIXER SLATE LEFT/RIGHT VU Meters: Indicate the level of signal that is being monitored, or the signal present at the Headphone Output. The meters also indicate battery voltage. MIC: This is the Slate Mic. When the SLATE button is pressed, this mic picks up signal at its input and sends the signal via the Master Level control to the Right and Left Outputs. SLATE: Engages the Slate Mic as well as a 20Hz tone. CH1 - CH4 LEVEL: Varies the signal level of the indicated channel to the mix bus. CH1 - CH4 PAN: Controls the amount of relative signal sent for the indicated channel to either the Right of Left bus. Limiter Adjust: This screwdriver adjustable potentiometer (not labeled on the panel) adjusts the amount of signal limiting by the MX442. MASTER: varies the overall signal from the MX442 Right and Left Outputs. HEADPHONE: Controls the level of signal sent to the Headphone Output. Power LED: Indicates that the MX442 is on. 400Hz TONE: When pressed, sends a 400Hz 0 dB reference sine wave signal to the Right and Left Outputs. LEFT PANEL MIC 1 - 4: Balanced XLR connectors for connection to dynamic or condenser microphones. +48 volts of phantom power is available for each input. TRIM 1 - 4: Adjusts the input gain to the indicated channel. 20 dB PAD (CH 1 - 4): When in, attenuates that channel's input level by 20 dB. LOW CUT (CH 1 - 4): When in, attenuates that channel's frequency response below 100 Hz. RIGHT PANEL + - HEADPHONE SELECT: Selects which signal is being sent to the Headphone Output as well as the front panel meters; Stereo, Mono, Right, Left, or the Monitor signal. BATT TEST: When pressed in, indicates the current battery condition via the front panel VU meters. Use the black percentage scale. HEADPHONE Output: 1/4" TRS stereo jack for connection to any standard pair of headphones. MONITOR IN: 1/4" TRS stereo input jack for connection to a cue or monitor mix. AUX IN: 1/4" TRS stereo input jack for joining two units together, or adding a stereo line-level signal. LEFT OUT: Main Output - Balanced XLR jack containing the left portion of a stereo signal, for connection to a recording device, mixer, or amplifier. 2 RIGHT OUT: Main Output - Balanced XLR jack containing the right portion of a stereo signal, for connection to a recording device, mixer, or amplifier. -25/+4 dB Switch: Sets the output level of the Main LEFT and RIGHT Output jacks to -25 dB or +4 dB. POWER: Toggle switch, when positioned towards the power jack; applies power to the MX442. 12 - 16 VDC: Input connector for connection to an auxiliary power source such as a Rolls PS27. REAR PANEL BATTERY COMPARTMENT: Holds two 9V Alkaline batteries to power the MX442. DIP SWITCH: Switch 1 activates and bypasses the internal limiter. Switch 2 selects the MX442 Output Mode; Mono or Stereo. Switch 3 through 6 activates the phantom power for the indicated microphone channel. NOTE: The switch is "ON" when in the DOWN position. CONNECTION Connect XLR microphone cables to the Microphone inputs and to the microphones. If necessary, apply phantom power to any condenser microphone. Connect the Right and Left Master Outputs to the recording device or amplifier via XLR cables. Stereo headphones are to be connected to the Headphone Output, the Auxiliary input may be connected to another MX442 or other stereo signal source, the Monitor input may be connected to the master mixing board for a monitor or cue mix. OPERATION · Setting the Mic Levels Begin by plugging in the microphone(s). Set the channel Level controls at 3 O'clock, and the Master Level control at approximately 12 O'clock. Speak into the microphone and adjust the Trim control until the average meter reading is 0 VU. For recording in stereo, adjust the Pan control to place the signal in the stereo field. · The Slate and Mic switch Press the Slate button and speak into the Slate Microphone to send the 20Hz slate tone and message to the main outputs and the recording device. · The 400 Hz Tone switch Press in this switch to send a 400 Hz reference tone to the output for setting system levels. · The 20 dB Pad switch Some condenser microphones put out a high amount of signal which makes it difficult to set the Trim and Level controls easily without overloading the gain circuits. The 20 dB Pad switch is pressed in if the microphone is "too hot" or putting out a very high level signal. · The Low Cut switch The Low Cut switch, when pressed in, rolls off the low frequencies starting at 100 Hz. This is used for removing unwanted "rumble". · The Headphone Select Switch There are many instances where different portions of the signal need to be monitored. When microphones are panned to different areas of the stereo field, sometimes one mic may be completely right and another completely left, it may become necessary to monitor each side individually. To monitor the signal present at the Right Main Output, select the "Right" setting. Similarly, set the Headphone Select to "Left" to monitor the Left Main Output. To hear both sides in stereo, select "Ster"; to hear both signals summed together in mono, select "Mono". Finally, hear the stereo signal present at the Monitor Output, select "Monit". · The Monitor Input jack This input receives a 1/4" Tip-Ring-Sleeve stereo signal, and is typically used for monitoring another mixing board at a master location. For example, the Right and Left mix from the MX442 is sent to a master console where a mixing engineer is controlling the audio sent to a main television or radio station. This engineer may need to send cues and other instruction to the person operating the MX442. A mix of the signals sent from the MX442 and the mixing engineer's voice may be sent via a 1/4" TRS stereo line to the MX442 MONITOR IN and the person operating the MX442 can hear both his mix and the mixing engineer. · The Aux Input jack This 1/4" TRS stereo jack joins the main mix just before the Master and Headphone Level controls. This input is used whenever other signals need to be mixed with the MX442 signals, and sent to the MX442 Main Outputs. · The Output Level -25/+4 dB switch Some master mixing boards will need to receive line level (+4 dB) signals, and others may have preamplifiers that cannot by bypassed and therefore will need to see mic level (-25 dB) signals. Most recording devices are designed to receive line level signals. 3 · The DIP switches The 6-DIP switch located on the rear panel provides phantom power for each individual microphone input, selects mono or stereo output operation, and activates the internal limiter. The limiter is used to compress the overall MX442 signal to a level which will not exceed +4 dB. Note that this limiter may be adjusted by the screwdriver potentiometer located between the Channel 3 and Channel 4 Pan pots. If the MX442 is being used in an area where there is a wide dynamic range of sounds (the sound varies from very quiet to very loud), the limiter is used to keep the signal within a certain manageable range. The Mono/Stereo switch, when in the Mono (down) position, both the Right and Left outputs are summed together. Finally, switches 3 through 6 provide the indicated channel with +48 volts of phantom power to power condenser type microphones. SPECIFICATIONS Input Impedance: Output Impedance: Max Input Level: Output Level: Max Gain: Phantom Power: Slate Tone: Level/Setup Tone: Low Cut switch: EIN: THD: 10k ohms bal./unbal. 50 ohms +14 dBm +20 dBV max 70 dB +48 VDC (Individually switchable) 20 Hz 400 Hz 100 Hz -128 dB <.003% SCHEMATIC TP50K TP1 SW 12. C 103 503 R 101 6 .8 K 3 8 C33 .0 4 7 SLATE R8 R22 1M R21 100K R12 R11 10K 2 3 U4A 4560 1 22K V+ V+ PHAN R 108 R 107 4 .7 K C 104 470P. 2 Q 101 30 C 105 470U 2N 5087 G A IN R 110 4 .7 K C 10K 33K R 111 6 U1B R 113 33K 7 R 102 6 .8 K 8 R 103 10K SW 1A DPDT C 1 0 13 NP 1 R1 22K P9 P100K R2 22K 3 VTL5C 3 4 R6 100 C1 47P. V+ 6 2N 3904 Q3 C32 .0 4 7 1K C2 R13 1K 10U C3 10U C12 .0 1 C13 .0 1 2 C14 .0 1 2 R49 1M R78 S L A T E M IC 2 1 HD1A HD2 2 SW 16A 4PDT 3 1 3 1 2 D IP 6 5 5 C 111 120P. V+ TL062 R3 100K V+ 1 R72 100K 2 U9 4 P14B P100K X2 R20 22K HD1B HD2 P IN 2 "H O T " J5 X LR JA C K M P1 2N5087 Q 102 +VB C 106 102 1K 1% P5 P100K +VB R71 100 J1 1 470 R79 10K 4 5 6 SW 16B 4PDT C8 .1 5 C9 .1 5 C10 .1 5 R45 100K V+ R51 22K R44 1M 2N 3904 Q1 10U . 2 C 1 0 21 0 U . XLR . PC B A L IN NP4 6 SW 1B R 105 1K 1% 5 +VB R 106 2K R 112 R 109 2K C 110 470P. C 107 120P. +VB C 109 10U C 211 120P. 6 R5 22K 5 C21 47U Q 404 2N 3904 R18 470K R19 470K 2 1 4560 U4B 7 C 108 .0 4 7 3 1 SW 2A DPDT 2 R10 10K R4 22K MONO R 104 10K SW 12E DPDT PHAN SW 12B D IP 6 +VB THRSH TP50K R65 R9 10K C20 10U SW 12A D IP 6 R81 10K R80 470 V+ G A IN 33K R 210 4 .7 K C 10K R 211 4 +VB R46 22K R47 22K R48 22K C15 .0 1 2 R41 47K Q2 J113 SW 10 R42 47K R43 47K C11 .1 5 C 203 503 R 201 6 .8 K J2 1 3 D IP 6 R 203 10K SW 3A DPDT 3 1 SW 3B R 207 4 .7 K C 204 470P. 2 R 208 30 C 205 470U 2N 5087 3 2 U1A R 213 1 R14 P10 P100K 22K R15 22K P6 P100K 1 3 TL062 400H Z R 202 6 .8 K C 201 10U . N P P2 2N5087 R 212 +VB C 206 102 1K 1% Q 201 R 205 1K 1% Q 202 R 209 2K R55 47K 2 C 207 120P. +VB C 2 0 21 0 U . N P 4 XLR . PC B A L IN 6 R 204 10K SW 12D C 303 503 R 301 6 .8 K 3 5 +VB DPDT V+ PHAN R 308 R 307 4 .7 K C 304 470P. 2 R 305 1K 1% 5 +VB DPDT PHAN V+ R 206 2K C 208 .0 4 7 3 1 10U 8 SW 4A DPDT 2 +VB R16 22K R17 22K VTL5C 3 U3 R3 100 P100K X2 P14A 2 2 33K C4 .0 4 7 4 CR4 1N 4148 R 415 10K SW 11A DPDT SW SPST R ...