Whirlwind MIX61 User's Manual
Contents
1. 60 TO 18 n FEMALE XLR AAA na 1 2 5 ENE OPEN m HEADPHONE J NC iB o NAVV By JACK Y S BUSS HEADPHONE i MIC CLOSED VOLUME 60 TO 18 VPH MIC PRE 25dB GAIN VOLUME 60TO 18 Y e VPH J14 1 POWER LED 18 VDC NEUTRAL 18 VDC S MIC LINE CHANNEL CHANNEL 2 0 9 VOLUME SPECIFICATIONS Frequency Response Line mode Mic Mode Maximum Input Level Line mode Mic mode Input Impedance Line mode Mic Mode Maximum Output Level Output Impedance Rise Time Common mode rejection Total Harmonic Distortion Noise Line Mode at unity gain Mic mode at 40dBm gain Minimum Headphone Impedance Size Weight Shipping Weight Unit Weight CHANNELS CHANNEL 4 4 E CHANNEL D j 4 23 or 3dB 6Hz to 44kHz 2dB 20Hz 7dB 20kHz or 3dB 13Hz to 43kHz 1 5dB 20Hz 7dB 20kHz 22dBm 3dBm 20k ohms 1064 ohms 22dBm 100 ohms 8uS gt 55dBm at 50Hz 00596 0496 50 ohms Single Space Standard 19 0 482 6mm Width 6 0 152 4mm Depth 1 75 44 45mm Height 7 3 40kg 6 0lbs 2 75kg SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE SAUCIO 99 Ling Road Rochester New York 14612 Phone 716 663 8820 Fax 716 865 8930 Email Sales whirlwindusa com Http www whirlwindusa com2. U S Audio whirlwind e INTRODUCTION The Mix 61 is a mono 6 mic or line input to 1 line level output audio mixer with headphone monitoring Housed in a single space rack enclosure with XLR connectors the Mix 61 delivers professional quality audio with phantom power on all inputs and a user selectable voltage Switch for international power THEORY OF OPERATION Each of the 6 inputs of the Mix 61 is a female XLR with a mic line selection switch In the stock configuration 18 volt phantom power is present on all XLR connectors Phantom power can be disabled by switching jumper J14 from pins 1 2 to pins 2 3 See Controls and Functions On each channel a mic line switch attenuates the gain by 25dBm After the input circuits each input channel is applied to a level potentiometer circuit The potentiometer has an audio like taper from the 9 o clock to 3 o clock range providing incremental adjustments with the 12 00 o clock position providing unity gain in line operation Below the 9 o clock position the potentiometer attenuates the signal in larger increments and fully counter clockwise the attenuation is 60dB which will adequately mute most audio inputs Above the 3 00 o clock position the level control has larger increments of gain with 18dB when turned fully clockwise After the input channel circuitry the 6 channels are summed together and presented to both the master output and headphone circuits The master output level control and h
3. eadphone level control have tapers exactly the same as described above with the input section After the signal has left the master level circuits it is balanced and delivered to the male XLR output jack The output XLR drive circuit is designed such that if either pin 2 or 3 is shorted to ground it will not affect the other pin The signal going to the headphone level circuit is pre fader in that the master level control will not affect the headphone volume at all The headphone section is designed to accept headphone impedances of 50 to 600 ohms With low impedance headphones the Mix 61 s current amps will provide signal to the headphones that is loud enough to hear in noisy environments The headphone jack is TRS with tip and ring connectedto provide a mono outputto stereo headphones Power is connected to the Mix 61 via a standard universal power inlet AC cord provided and a 120 230 volt mains switch on the rear panel When the Mix 61 s power switch is activated the LED will light The Mix 61 s earth ground from the power inlet is connected to the chassis of the unit and also connected to the audio ground via jumper JMP5 This jumper can be removed to separate audio ground from earth See Controls and Functions UNPACKING U S Audio has made every effort to ensure that your equipment is received in the same perfect condition it was when it left the factory Please inspect your product for any signs of damage during shipping and r
4. eport them to your dealer so that a claim can be made to the shipper We recommend that you save your packing material for use in the unlikely event that you needto return your equipmentfor service s CHANNEL CHANNEL 2 VOLUME 120 Vac at 60 Hz 1 VOLUME CHANNEL CHANNEL 4 CHANNEL 5 CHANNE VOLUME VOLUME WARNING TO PREVENT ELECTRIC SHOCK DO NOT REMOVE COVER NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL CAUTION TO REDUCE THE RISK OF FIRE KD ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO ANY TYPE OF RAIN OR MOISTURE lt gt n VOLTAGE ATTENTION DEBRANCHER AVANT D OUVRIR 230 Vac at 50 Hz 25 watts MAX n U S AUDIO A DIVISION OF WHIRLWIND INC ROCHESTER NY USA BU 7 CONTROLS AND FUNCTIONS 1 INPUT VOLUME CONTROLS 1 6 vary the amount of signal sent to the master buss through a range of 60dBm attenuation at full off to 18dBm of gain full on 2 MASTER VOLUME CONTROL determines the amount of signal from the summing amp that is fed to the output This also has a gain range of 60to 18dBm 3 HEADPHONE VOLUME CONTROL varies the signal at the headphone jack The signal going into the headphone circuit is pre master fader and independent ofthe master volume pot 4 HEADPHONE JACK drives stereo headphones with impedances greater than 50 ohms and is wired mono with the tip and ring connected 5 POWER LED indicates thatt
5. he unit is turned on 6 POWER SWITCH connects AC to the transformer primary and the front panel LED indicates that the unit is working Both sides of the AC line are switched and the main fuse is located on the circuit board inside oftheunit 7 POWER CORD INLET for connection of a standard universal power cord SUPPLIED 8 VOLTAGE SWITCH for selecting between 120Vac at 60Hz or 230Vac at 50Hz 9 XLR OUTPUT controlled by the front panel master volume pot and provides balanced output 10 XLR INPUT for each of the 6 inputs provides a balanced XLR connection either mic or line level 11 MIC LINE SWITCH for switching between mic and line input levels 9 10 11 For JUMPER modification remove the top cover by removing 6 screws 2 ontop of each side 1 in front and 1 in back top center See Arrows To disable PHANTOM POWER switch jumper J14 from the default pins 1 and 2to pins 2and3 To remove EARTH GROUND from the unit remove JMP5 using a pair of wire clippers being careful not to disturb surrounding components PHONES VOLUME FRONT 0 FACTORY PHANTOM A DEFAULT DISABLED lt PN 13 f 2 CLIP AND REMOVE ee MASTER PHONES Q BE PHONES VOLUME SCREWS 2 f 3 4 5 6 5 INPUTS 18v PHANTOM POWER PRESENT ON ALL INPUTS SWITCHABLE INTERNALLY LINE Bl LINE MIC LINE E i OUTPUT MALE XLR BLOCK DIAGRAM MASTER VOLUME
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