American DJ Mix 44 User's Manual
Contents
1. U S Audio whirlwind Master 1 ais He Hy JG VOLUME Vouuue vowue VOLUME Aide Master 3 INTRODUCTION Thank you for selecting the US Audio Mix 44 The unique com bination of features in the Mix 44 offers a creative solution for countless audio mixing and distribution situations The four input by four output matrix design allows flexible routing of four line level signals to as many as four separate locations at the same time Applications include live sound monitor mixing industrial audio signal routing studio headphone cue mixing and teleconference mix minus generation Each mixer has four input volume controls and a master volume control with a clip LED Connections are made through actively balanced profes sion XLR jacks The high input impedance of the Mix 44 1 Meg Q allows bridging any balanced audio line without load ing The Mix 44 represents an excellent value delivering pro fessional recording quality audio wherever discrete mixes are needed Other features include a headphone monitoring cir cuit loop thru jacks and switches to convert the Mix 44 into two four by two matrices In3 hs DEPOLO VOLUME e Voume voue VOLUNE Aine o fo vorune VOLUME YOLUME VOLUME VOLUME e youune Yorum Souume OPERATIONS MANUAL MIK 44 MATRIX MIXER MATRIX MIXER oe U S Audio C orn VOLUME METERMEADPNONES MIX MONTOR COT to t o 3 VOLUME VOLUME UNPACKING US Audio has m2. Mix Monitor Select Switches apply the output of each of the four mixers to the VU meter and the headphone circuit Outputs may be monitored individually or in any combination 5 LED VU Meter displays the exact level present at the out put XLR connectors measured in dBm Meter readings will be higher with multiple monitor select switches activated 6 Headphone Circuit monitors the signals going to the Mix 44 outputs Any combination of mixer outputs can be moni tored simultaneously It is a mono circuit which drives both earpieces in stereo headphones that have an impedance greater than 20 ohms The volume control has a gain range of 60 to 13dB to accommodate a wide range of audio levels The jack is a standard 1 4 TRS type 7 Power Switch connects AC to the transfornmer primary and the LED indicates that the unit is working Both sides of the AC line are switched and a mains fuse is located on the cir cuit board inside the unit Ina Master 2 MIX 44 D ka O 8 Input Female XLR Connectors are actively balanced dif ferential amplifiers providing over 75dB of common mode rejection The input impedance is factory set at 1Meg ohms which eliminates loading of the source signal Pin 2 is positive pin 3 negative and pin 1 is connected to audio ground 9 Loop thru Male XLR Connectors serve two purposes depending on the position of the input select s
3. operation Pin 2 is positive pin 3 is negative and pin 1 is audio ground for all connections Next to each male XLR there is an input select switch which determines how matrix 3 and matrix 4 are fed input signal With the channel input select switch set to the normal loop thru in position the female and male XLR are parallel wired for in and thru connections With the channel input select switch in the out position the female XLR becomes the input for matrix 1 and matrix 2 only and the male XLR becomes the input for matrix 3 and matrix 4 This config uration eliminates the thru connection but increases flexibility by completely separating mixers 1 and 2 from mixers 3 and 4 Female to female XLR adaptors can be used to change the sex of the male connectors All the gain controls on the Mix 44 Channel gain and Master have a range of 60 to 13dBm Total gain of the unit is 26dB With both the channel and master volume controls at the same position unity gain is at the 12 O Clock knob position The 60dB of attenuation in the off position allows the Mix 44 to adequately turn off line level signals Maximum signal level through the Mix 44 at clipping is 28dBm balanced and 22dBm unbalanced The same figures apply to both the input and the output and individual clip LEDs are provided which illuminate at 3dB below actual clipping With THD n typical ly lees than 02 in the entire audio spectrum and a unity gain signal tp noise ratio
4. Q 9 O i OO gt gt 2 oF o a POWER ON GROUND I LIFT v aval LA HEADPHONES 10 SEGMENT VU METER SEGMENT VU METER Block Diagram Matrices 3 and 4 can be separated from matrices 1 and 2 via the Frequency Response Input Impedance Max Input Level Output Impedance Max Output Level Total Gain T H D n Rise Time Phase Shift Intermodulation Distortion EIN loop thru switches providing even more flexibility SPECIFICATIONS 3dBm 20 to 20KHz 1M Q balanced 22dBm unbalanced 28dBm balanced 100Q balanced 22dBm unbalanced 28dBm balanced 26dB 007 at 1kHz lt 02 20Hz 20kHz 8ps lt 01 degree at 1kHz 01 at unity gain 90dBm Working S N Ratio 22dB headroom at unity gain at 18 dB gain P O Box 12692 Rochester NY 14612 716 663 8820 85dBm 79dBm C M R of Inputs LED Clip Threshold Range of Level Pots Range of Headphone Volume Control Power Consumption AC Dropout Voltage Internal Mains Fuse gt 75dBm 60Hz 19dBm unbalanced 25dBm balanced 60 to 13dBm 60 to 13dBm 3 Amps Max A C 120VAC 3 Amps Max A C 230VAC 105 V A C 120Vac 205 V A C 230Vac 25 Amps Slo Blo 3AG Size Single Space Standard E I A Spec Shipping Weight Unit Weight 19 0 482 6mm Width 6 0 152 4mm Depth 3 5 88 9mm Height 11 Ibs 4 99kg 9 0 lbs 4 08kg U S Audio whirlwind
5. ade every effort to ensure that your equipment is received in the same perfect condition it was in when it left the factory Please inspect your product for any signs of dam age during shipping and report them to your dealer so that he can present a claim to the shipper We recommend that you save your packaging material for use in the unlikely event that you need to return your equipment for service THEORY OF OPERATION The Mix 44 combines four separate mixers into one unit pro viding a versatile method of line level audio signal mixing and distribution The four input by four output matrix design allows flexible routing of four input signals to as many as four sepa rate locations at the same time A typical use for the Mix 44 is as an outboard four channel matrix with four buss audio con soles to provide multiple feeds All inputs and outputs are active electronically balanced circuits accessed through XLR connectors The input section and all critical gain sections of the Mix 44 use the same IC chips as top professional mixing boards The inputs are instrumentation grade differential amplifiers which yield exceptionally high Common Mode Rejection CMR The C M R of the Mix 44 is greater than 75dB 20 to 20KHz The Mix 44 has a 1 Meg Q input imped ance allowing it to tap onto any balanced audio line without loading it l Each of the 4 inputs is connected through a female XLR and is parallelled to a male XLR thru jack for normal
6. greater than 85dB with 22dB of headroom the Mix 44 delivers excellent sonic performance An internal provision has been made for a direct input to the sum buss of each mixer The Mix 44 can be individually customized to take advantage of this feature if required The male output XLR connectors on the Mix 44 are actively balanced with pin 2 being positive pin 3 being negative and pin 1 being audio ground For unbalanced operation use pins 1 and 2 leaving pin 3 UNCONNECTED The Mix 44 has a monitoring section consisting of channel select switches an LED VU meter a headphone volume con trol and a 1 4 TRS headphone jack Selecting any combina tion of the 4 channel select switches routes those channels audio signals to the headphone circuit and the LED VU meter allowing the user to monitor the output of the mixers The VU LEDs display in dBm the exact level that is at the XLR output The headphone circuit is a mono type which drives both left and right stereo earpeices The circuit works with any head phones of greater than 20 ohm impedance The headphone vol ume control also has a gain range of 60 to 13 dB to accom modate a wide range of audio levels The Mix 44 utilizes two dual primary power transformers which can be configured with internal jumpers for 120 VAC 60Hz or 230 VAC 50Hz operation There is an internal fuse on the hot side of the AC cord and the power switch makes and breaks both the hot and neutral legs of the AC co
7. rd A ground lift switch is provided which can disconnect the audio circuit ground from the AC chassis ground CO int In2 In3 Ing Master 1 COGO OHO VOLUME VOLUME VOLUME VOLUME Sue VOLUME Youuwe 7 4 B Ai Int In2 In3 In4 Master 3 Int 7 s 9 GOGO VOLUME VOLUME VOLUME VOLUME TO VOLUME ng ind 5 8 2 ig g RIK MIXER 7 7 3 7 OHO O E a a g Voume Voume TaI Headphones Ing Master 4 in2 8 8 ONG HOO 1 MITT 1mm MX MONTOR g i l T VOLUME VOLUME PIN 1 SHIELD LOOP JACK BIN 2 POS 4 PIN 3 NEG SWITCH RELEASING THE swites BREAKS o o MARKON AND 4 MATRIX 2 OUT MATRIX 1 OUT MADEN USA BY 100P JACK tisaovac rigi cout anu MATRIX 4 OUT MATRIX 3 OUT soso He A DIVISION OF WHIRLWIND INC ROCHESTER NY USA aiD OH AUDIO GROUND TO EARTH eon ie asa MFT CONTROLS AND CONNECTIONS 1 Channel Volume Pots control input signals feeding the master volume over a range of 60dBm attenuation at full off to 13dBm of gain at full on 2 Master Volume Pots determine the amount of signal from the summing amps that is fed to the output drivers and the headphone monitor circuit These have a gain range of 60 to 13dBm 3 Clip LEDs on each of the four master outputs indicate sig nal overload conditions within the circuitry The red clip lights illuminate at 3dB below actual clipping the unit clips at 28dB balanced so the LEDs come on at 25dB 4
8. witch The first function is as actively balanced differential inputs providing over 75dB of common mode rejection for mixers 3 and 4 The other purpose is to act as loop thru connectors for signals applied to the corresponding female input Input impedance is also 1Meg ohms with pin 2 positive pin 3 negative and pin 1 connected to audio ground Female to female XLR adaptors can be used to correct gender when used as inputs 10 Input Select Switches determine the source of input sig nal for mixers 3 and 4 In the loop thru in position the male XLRs are parallelled to the female inputs above them With the switch out mixer 3 and 4 inputs are accessed through the male XLR connectors 11 Output XLRs on the Mix 44 are actively balanced with pin 2 being positive pin 3 being negative and pin 1 being audio ground For unbalanced operation use pins 1 and 2 leaving pin 3 UNCONNECTED 12 Ground Lift Switch connects the audio circuit ground to AC ground and the chassis of the unit if desired 13 Power Cord has a standard 15 amp plug for 120Vac and has no plug on the Mix 44X 230Vac model Black is line white is neutral and green is earth pA 5 No OL0OP TOJOTHRU 1 ok Le gt y Py fo oLoar OOJO THRU 2 Ree gt Let EKD CH 1 OUT ED CH 2 OUT CHASSIS GROUND owo o0 0 4 Oo oO
Download Pdf Manuals
Related Search