Sound Devices 302 Three Channel Portable Mixer user manual
Contents
1. 21 Q Cy PHONES 19 19 Transformer Balanced Inputs NOTE Use T Powering only for T Powered micro Can be used unbalanced by grounding pin 3 to phones pin 1 of the XLR connector Pin 1 ground pin 2 22 Phantom Voltage Selection hot pin 3 cold Selects between 48 V or 12 V phantom voltage 20 Mic Line Channel Switch for the input channels The three position switch Selects the input level of the adjacent connector uses two positions for 12 V there is no difference Mic level has 40 dB more gain than line level between these positions 21 Phantom DYNamic T Power Selection 23 Headphone Output Selects the microphone powering type of the adja 1 8 inch TRS stereo headphone output Can drive cent input DYN position turns off all microphone headphones from 8 to 2000 ohms to required moni powering Mic powering is selected per input toring levels Ourput PANEL DESCRIPTIONS L LINE mic R LINE uic 24 k SET UP FEAT SEE USER MANUAL FOR UNBALANCED XLR OUTPUT DO NOT GROUND PIN 3 IL RTNR CHa CH5 26 T Pin4 TAPEPUT pp 1a 29 30 27 25 28 24 XLR Master Outputs 27 Channel 4 5 Activation LED When illuminated indicates that the return connec Active balanced outputs Pin 1 ground pin 2 i i tor is now set as an input 4 and 5 connections hot pin 3 cold Can be unbalanced by using pin 2 for2. the audio signal overloading a circuit is usually far more objectionable For most applications the limit ers are a significant benefit and should be enabled Tone OSCILLATOR SLATE MicrRoPHONE A single 3 position switch controls both the tone oscil lator and the slate microphone The tone slate switch is located in the upper right corner protected from inadvertent engagement by the end panel When the tone oscillator or slate microphone is engaged program is interrupted to the master bus MIC 1K Tone is used to set gain structure between the 302 and the next device in the signal path The tone oscillator uses the locking position of the switch Tone Oscillator From the factory the tone oscillator is set to output a 1 kHz tone at 0 dBu to the outputs when the outputs are set to Line level In the Setup Menu the tone frequency and output level can be adjusted and tone can be de feated When engaged the 302 tone oscillator attenuates the headphone output by 20 dB to save the operator s ears This feature can be defeated in the Setup Menu sounn DEVICES Pressing the battery check button when the tone oscil lator is active sets the left output to cycle between 0 and 20 dB This is helpful to verify proper left and right channel connection Turning off the tone oscillator or pressing the battery check button again stops the out put cycling When adjusting the output attenuation in setup mode acti
3. bi polar regulated audio rails 2 4 6 V range internal batteries Isolated floating external DC input jack 5 18 V Locking 4 pin Hirose connector pin 4 pin 1 use Hirose HR10 7P 4P DigikKey HR100 ND for locking mating DC connector SOUND S DEVICES 302 Compact Production Mixer User Guide and Technical Information Power Consumption 130 mA 4 5 V internal batteries idle no phantom 55 mA 12 V external DC idle no phantom Metering 40 segment 2 x 20 sunlight viewable Selectable Peak VU or Peak with or without peak hold VU ballistics Weight 0 85 kg 1 8 lbs unpackaged with three alkaline AA batteries Dimensions 47 mm x 214 mm x 114 mm H x W x D 1 8 x 8 4 x 4 5 302 Compact Production Mixer page 15 User Guide and Technical Information WARRANTY amp APPROVALS Warranty Sound Devices LLC warrants the 302 Production Mixer against defects in materials and workmanship for a period of ONE 1 year from date of original retail purchase This is a non transferable warranty that extends only to the original purchaser Sound Devices LLC will repair or replace the product at its discretion at no charge War ranty claims due to severe service conditions will be addressed on an individual basis THE WARRANTY AND REM EDIES SET FORTH ABOVE ARE EXCLUSIVE SOUND DEVICES LLC DISCLAIMS ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
4. 7P 4P to mate with locking 4 pin DC power jack XL NPH with 302 442N 442 and MixPre NP type battery cup with 12 inch cable with Hirose 4 pin locking power jack at equipment end For use AppenpDIX B METERING amp GAIN MATCHING The 302 includes a unique output attenuator circuit which is adjusted via user setups This can be thought of as a master gain control which comes after the 302 s output meter This circuit allows the user to match the 302 s output level to any recording device When prop erly set dynamic range of the system is maximized and the 302 s meters will match the recorder s meters For simple interconnection the following three setting are identical to setting the output switch on the 442 mixer to Line Tape or Mic 0 dB Line 14 dB Tape 40 dB Mic However to tailor the 302 s outputs exactly to the re cording device the 302 s output can be attenuated from full line level in steps of 1 dB from 0 to 16 dB line tape levels then 40 to 56 dB mic levels So if 40 dB of at tenuation is too hot for a given device s mic input the attenuator could be set to 50 dB or more When interconnecting the 302 to any recording device the best way to set the level between them is to match the 302 s output clipping level with the recorder s input clipping level When this is done and the recording device s input gain controls are kept fixed two things will hap
5. PARTICULAR PURPOSE SOUND DEVICES LLC IS NOT RESPONSIBLE FOR SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING FROM ANY BREACH OF WARRANTY OR UNDER ANY OTHER LEGAL THEORY Because some jurisdictions do not permit the ex clusion or limitations set forth above they may not apply in all cases For all service including warranty repair please send the 302 along with proof of purchase date to Sound Devices LLC Service Repair 300 Wengel Drive Reedsburg WI 53959 USA FCC Statement This device has been tested and found to comply with the limits for a class B digital device pursuant to part 15 of the FCC rules These limits are designed to provide reasonable protection against harmful interference in a residen tial installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation CE Conformity Statement Declaration of Conformity According to ISO IEC Guide 22 Manufacturer s Name Sound Devices LLC Manufacturer s Address Sound Devices LLC 300 Wengel Drive Reedsburg WI 53959 USA declares that the product 302 Production Mixer is in conformity with Document No Description EN55103 1 1997 Emissions standard for product family audio devices for professional use EN55103 2 1997 Immunity standard
6. Stereo Link 26 MS Link 24 Links inputs 1 and 2 as a stereo pair either X Y or Channels 1 2 MS stereo 22 Input Limiter Defeat OFF 30 ON 26 When ON input limiters remain OFF at all times 20 RTN L to Channel 4 OFF 30 L only 26 R only 24 L R 22 Routes RTN Left signal to the master bus with the Input set pan assignment 18 RTN R to Channel 5 OFF 30 L only 26 R only 24 L R 22 Routes RTN Right signal to the master bus with Input the set pan assignment 16 Tone Oscillator 1000 30 400 26 100 24 Hz Selects the frequency of the sine wave tone Frequency oscillator 14 Tone Oscillator Level OFF 30 20 dBu 26 10 dBu 24 1 dB Selects the output level of the tone oscillator in increments to 8 0 dBu is default dBu at LINE level 12 Slate Mic ON OFF ON 30 Tone Slate 26 OFF 24 Activates the slate mic Tone and slate offers a 400 Hz tone preceding the slate mic 10 Metering Source ST amp PFL 30 Follows headphone switch posi Selects the metering source PFL levels are show tion 26 STereo only 24 on the left meter 8 VU Reference Level 0 dBu 30 4 dBu 26 8 dBu 24 Selects O VU to dBu reference level 6 Split Ear Monitor OFF 30 ON 26 Program Mix 24 Assigns summed mono RTN signal to left head phone output and R program to right headphone output Active in RTN position 4 Headphone ON 30 OFF 26 Reduces the headphone level by 20 dB when Attenuati
7. V As the mics draw the same current no matter what the phantom voltage operating at 48 V consumes four times the power as 12 V with no performance gain This excess power draw can make a significant difference in battery life and is the reason the 302 allows the user to select the phan tom voltage It is generally good practice to turn off phantom power when not using a phantom powered mic as phantom power can capacitively couple noise into the mic inputs with poor mic cables Also turn phantom power off when using ribbon microphones since an improperly wired cable can permanently damage the microphone The DYN dynamic position applies no voltage to the microphone input The 12 V 48 V phantom voltage switch sets the overall phantom voltage selection It does not apply this volt age to an input only sets the phantom voltage avail able DYN PH Tl 7 T Powering T powering is a microphone powering scheme used by several European condenser microphone manufactur ers Today T powered microphones are not as common as phantom powered microphones but many are still in regular use Unlike phantom power T power resistively applies 12 V between the signal pins 2 and 3 T power can be selected for each input The 302 provides positive T power where pin 2 on the XLR 3 connector has 12 volts relative to pin 3 When using red dot T powered microphones reverse polarity T power use a polar ity reversing adap
8. for product family audio devices for professional use EN55022 1995 Radiated and Conducted emissions Class B CISPR 22 1997 EN61000 4 2 1995 ESD 6kV contact 8kV air discharge 1EC1000 4 2 1995 EN61000 4 3 1995 Radiated RF Immunity 3 V m 80 1 kHz amplitude modulation 1EC1000 4 3 1995 EN61000 4 4 1995 EFT Burst I O lines 0 25 kV to 1 0 kV 1EC1000 4 4 1995 EN61000 4 6 1996 Conducted RF Immunity 3 V 80 1 kHz amplitude modulation 1EC1000 4 6 1996 Tested by L S Compliance Inc Cedarburg Wisconsin March 26 2003 Matthew Anderson Director of Engineering sounn G DEVICES page 16 302 Compact Production Mixer User Guide and Technical Information APPENDIX A ACCESSORIES Several high value accessories are available for the 302 mixer including a carry case cables and power accessories For a full list of Sound Devices products and accessories visit our web site www sounddevices com products CS 302 Carry case designed exclusively for the 302 mixer Features a bottom side pouch that accepts an NP type battery and leather shoulder strap Accepts Portabrace RM multi and RM deluxe accessories and AH 2 har ness not included XL 1 TA3 F to TA3 F link cable for 302 to 302 and 302 to 442 linking 6 inch XL 3 3 5 mm to TA3 F link cable for MixPre MP 2 Tape Output to 442 Mix In 12 inch XL 4 Bag of four 4 TA3 F type connectors XL H Bare Hirose connector Hirose p n HR10
9. only peak only combo peak VU peak hold VU Mic Tone Switch Two position switch activates either the slate mi crophone in the left momentary position or a tone oscillator in the right latched position Additional options available in the User Setup Menu Headphone Selector Sets the signal source sent to headphones Options include channel PFL 1 2 3 left output bus right output bus Mono summed left and right STereo master RTN stereo monitor return MS mono MS stereo RTN MS Headphone Volume Adjusts the overall volume of the headphones NOTE the headphone output is capable of ear damaging levels Take care when adjusting among signal sources Headphone LED Indicates overload of the headphone circuit and RTN circuit Power Switch LED Three position switch selects between internal battery power or external DC sources Power LED illuminates when power is on LED flashes when voltage reaches low limit see Powering Battery Check Button Depressing indicates both internal and external battery levels on the output meter Battery level is shown for two seconds after button pressing 302 Compact Production Mixer page 5 User Guide and Technical Information Input PANEL DESCRIPTIONS Q siDE 3 IC LINE DYN MIC LINE DYN MIC LINE PH a DYN
10. 02 s Output Attenuator via the up down buttons until the recorder is just shy of clipping as indicated on its meter If the 302 s Output Attenuator is at 0 dB and the recorder is not to its clip level increase the recorder s gain control until it is to the clip level Fix the recorder s gain controls with tape so that they do not get bumped Exit the 302 s setup menu by pressing the PK VU switch until the startup sequence happens Note The setup menu must be exited in this manner or else the setting will not be saved It is recommended that the 302 s limiters be turned on at all times as they will not activate until just before clipping 302 Compact Production Mixer User Guide and Technical Information page 17 AppenDIx C Serup Menu v 1 Below is the chart of setups for the 302 See Setup Menu on page 12 for instructions on how to enter and navigate the setup menu Meter Setting value on R meter Pos Setup factory default bold underlined Description 30 XLR Attenuation Level Line level 0 add the indicated values on left Selects the amount of attenuation from Line level and right meter for attenuation amount on the XLR outputs 26 Output Limiter 1 dB increments from 4 to 20 dBu level Sets the output limiter threshold in dBu see page Threshold Adjustment shown on meter 12 in User Guide for more details 24 Stereo Link OFF 30
11. Frequency Response 20 Hz 30 kHz 0 2 0 5 dB 1 dB 5 Hz and 50 kHz typical Equivalent Input Noise 126 dBu 128 dBV maximum 22 Hz 22 kHz band width flat filter trim control fully up Common Mode Rejection Ratio 120 dB minimum at 80 Hz mic input 100 dB minimum at 10 kHz mic input Input Clipping Level 0 dBu minimum trim control fully down L R Gain Matching Mic In to Line Out g Aa 0 1 dB Line Output Clipping Level 1 THD 20 dBu minimum 18 dBu minimum with 600 ohm load High Pass Filters Switchable 80 Hz or 160 Hz 12 dB oct Mic Powering each mic selectable Dynamic no power applied 12 V Phantom though 680 ohm resistors 10 mA per mic available 48 V Phantom through 6 8k resistors 10 mA per mic available 12 V T Power through 180 ohm resis tors 10 mA per mic available Dynamic Range 115 dB minimum trim fully down THD Noise 0 007 typical 1 kHz 4 dBu at Line out 0 009 max 50 Hz to 20 kHz 18 dBu at Line out fader fully up sounn DEVICES page 14 Input Limiters 18 dBu threshold 20 1 limiting ratio 1 mS attack time 200 mS release time Temperature Operating 20 C to 60 C 0 to 95 relative humidity non condensing Storage 40 C to 85 C Output Limiters Affects the outputs of the mixer Threshold selectable from 4 dBu to 20 dBu 1 dB steps 20 1 limiting ratio 1 mS attack time 200 mS release time Power supply Internal 16 V
12. P Monitor Selection Interconnection Headphone Level and Overload LED Setting Output Gain Structure Ballistics Setting Input Levels Power Switch and LED Monitoring Internal Batteries Front Panel Descriptions 4 External DC Sources Input Panel Descriptions 5 POWEPING 6 ee eee ee eee eee eee 11 Output Panel Descriptions 5 lluminatior Intensity Ch l 6 Power Metering Input annels os eee eee eee eee Power Consumption Mic Line Level Selection Entering the Setup Menu Gain Trim Setup Example Faders The Setup Menu 202000e 12 User Default Output Limiter Adjustment Microphone Powering Phantom Power Basics T Powering High Pass Filters Specifications 0 cee eee eee 13 Input Channel Limiters Warranty amp Approvals 15 Peak and Limit LEDs Warranty Polarity Reverse Channel 2 FCC Statement Stereo Linking of Channels 1 and 2 CE Conformity Statement Outputs cies wa EE E ei Se 8 Appendix A Accessories 16 XLR Outputs Appendix B Metering amp Gain Matching 16 Inputs Zea Appendix C Setup Menu v 1 17 Output Limiters 0005 9 Link Stereo Operation Tone Oscillator Slate Microphone 9 Tone Oscillator LIM Dual Mono Slate Microphone Headphone Monitoring 10 Source Scale SOUND G DEVICES 302 Compact Production Mixer page 3 User Guide and Technical Information Quick START CHECKLIST P
13. are used for the inputs Stereo linking is selected in the User Setup menu X Y Stereo Link Input channels 1 and 2 can be linked as a stereo pair to simplify control with stereo micro phones X Y stereo linking is set in the User Menu When in X Y stereo link operation channel 1 and 2 pan controls still control signal routing Channel fader 2 con 302 Compact Production Mixer User Guide and Technical Information trols the overall level of both inputs The channel gain and high pass controls still function on each channel In X Y Stereo linking the input limiters for channels 1 and 2 are linked to operate identically on each signal MS Stereo When MS stereo linking is set in the User Menu input channels 1 and 2 are linked as an MS mid side stereo pair MS is a popular stereo configuration because of its good spatial placement mono compat ibility and surround compatibility The 302 s MS matrix uses the channel 1 input as the Mid signal and channel 2 as the side signal The channel 2 fader controls overall gain Channel 1 fader and channel 2 pans are disabled The Gain Trims and high pass filters still act individually The Gain Trim controls for inputs 1 and 2 can be used to vary the Mid and Side levels re spectively Using the channel 2 gain trim is an effective way to control stereo spread O ENABLE Inputs 4 amp 5 RIN When additional input channels are needed such as when multiple wireless receivers ar
14. ary switch selects the signal PFL 1 PFL solo monitoring of the channel one input signal Channel is monitored in mono Pre fade post limiter post high pass Useful for setting the channel gain PFL 2 same as above but for channel 2 input PFL 3 same as above but for channel 3 input L Left output bus monitored dual mono R Right output bus monitored dual mono M Summed mono of left and right output bus ST Stereo monitoring of master output bus This is the primary monitoring path RTN Stereo return from the RTN monitor input path M MS Monitoring of the mono signal of an MS stereo signal ST MS Monitoring of discrete MS signals in head phones as decoded stereo signal RTN MS Monitoring of discrete MS return signal in headphones as decoded stereo signal Headphone Level and Overload LED The headphone level knob controls overall headphone level to the phones The adjacent LED indicates that the headphone circuit is overloading The LED will also illuminate with an overloaded RTN signal THE METER The meter on the 302 provides a great deal of audio signal information for the operator The ability to view peak level PPM average levels VU or a combination of both is unique to Sound Devices LED based meters In addition to the flexibility to provide multiple meter bal listics the meter does not have the inherent limitations of LCD and mechanical meters sluggish indic
15. ations in cold temperature with LCD s and fragility with mechani cal meters The 302 meters share the same technology and software programmability used in Sound Devices larger 442 field mixer Bate pi Source ot Ole LTP a C j Niin mee The meter can display mS D levels of the output bus lt S eo the PFL levels or levels from the RTN inputs Default operation is always the output bus except when PFL s are selects via the rotary switch This operation can be altered via the setup mode Scale The 302 s numerical meter scale is calibrated for dBu in peak operation and for VU in VU operation The 302 s scale is designed for today s quiet recording devices providing maximum resolution between 30 to 0 dBu 50 to 20 dBFS This allows the user to record with a full 12 to 20 dB of headroom while in the fine resolu SOUND S DEVICES tion green colored part of the meter Additionally the meter color changes to orange at 0 dBu and then red at 8 dBu These color changes correspond to 20 dBFS and 12 dBFS respectively which are commonly used record ing levels for today s recording devices Ballistics The 302 output meter can indicate several different selections of ballistics The available choices that are selected with the front panel meter ballistics button can be selected via a User Setup To move from one setting to the next depress the meter ballistics button Settings include VU calibrated to show av
16. e used the Return connector can be set as the channel 4 and 5 input con nector This functionality is set in the User Menu see User Menu Several options are available for channels 4 and 5 Either or both inputs 4 and 5 can be sent to the left right or left and right output bus The input sensitivity of channels 4 and 5 are controlled by the trim control adjacent to the connector Note this unbalanced input is suitable for aux or line level devices only There are no microphone preamps on channels 4 and 5 To indicate that the Return connector is now input channels 4 5 the 4 5 Input LED on the output panel illuminates OUTPUTS The 302 is a two bus mixer Since each input can be hard panned between the left and right output bus the 302 is easily used in either stereo or dual mono operation Because dialog is often recorded in mono each output connector can be used to feed a separate camera or recorder XLR Outputs and Tape Outputs are both sent from the master output bus and share the same program content The 302 has no master level control The master bus is factory set to unity gain or 0 dB XLR Outputs The master XLR outputs are active balanced connec tions each capable of driving long lines The master SOUND G DEVICES output level from the factory is set at unity gain where 4 on the meter peak viewing corresponds to 4 dBu signal level at the master XLR output The 302 features a uni
17. ement and on board microphone filtering Many microphones have on board high pass filters and the high pass filters on the 302 can be used in conjunction with the microphone s filters to increase the filter s slope The high pass filter can be removed by placing it in the center position LCR The pan switches assign an input channel s audio signal to the outputs Inputs can be sent to the left right or both outputs equally The 302 features excellent off attenuation of the channels in the left and right positions Pan Switches Input Channel Limiters The input channel limiters act solely as safety limiters and are enabled when the output limiters are enabled via the LIM switch on the front panel See Setup Menu to defeat Channel Limiters entirely In normal operation with a properly set gain structure the thresh old of the channel limiter will rarely be reached If ex tremely high input signal levels are approached such as in high SPL environments or with misadjusted settings the channel limiter s will activate to prevent the input channel from clipping Without a channel limiter hot signals could overload the channel and cause distortion It is recommended that the channel limiters be used at all times Below the factory set threshold just below clipping the limiter has no effect on audio There is no user adjustments to the channel limiter thresholds When input channels 1 amp 2 are lin
18. erage loudness of audio signals Useful when connecting to analog recorders or in combination with peak readings VU meters are too slow to be used as the sole metering with digital devices Peak important setting used to know the absolute peak signal level to prevent overload of down stream devices Peak only is commonly used in Europe but is being replaced by the PPM VU combi nation metering Peak with VU combination a very informative setting which for many users is the default used with the 302 Indicates the absolute peak level as well as the loudness of the signal 302 Compact Production Mixer User Guide and Technical Information Peak Hold with VU similar to Peak VU combination but with the peak level being held for 1500 ms Useful when a peak signal is encountered while the operator is not viewing the meters peak held long enough to know if signal exceeded desired levels page 11 Illumination Intensity The output meter can be set for comfortable viewing in all lighting conditions Four levels of brightness are available by depressing the meter intensity button POWERING The 302 can be powered from either internal batter ies or from external DC The power efficient 302 can operate from three AA alkaline batteries for nearly a production day without phantom powering While many users prefer external DC sources supplying both their mixer and wireless receivers the use of internal batteries i
19. fuse is reset when the voltage is removed In addition the external DC sup ply is isolated floating from the circuitry to minimize sounn G DEVICES ground loop and interaction among devices sharing the same DC source The DC connector is a Hirose 4 pin female This lock ing connector mates to Hirose P N HR10 7P 4P Sound Devices p n XL H Pin 4 is the positive voltage and pin 1 is negative Power Metering The battery check button indicates battery voltages of internal and external power supplies on the output meter The left meter shows the internal battery voltage and the right meter shows the external battery voltage Since many different battery types are available for ex ternal use the external DC metering can be customized for a given battery in the Setup Menu The power meter is read from left to right with the highest voltage indi cated with LED s lit all the way to the left green Power Consumption The 302 can vary in the amount of current it draws Sev eral functions of the 302 directly affect current draw in different ways The following list highlights the larger current drawing functions listed from highest to lowest current draw e Microphone powering the main source of current be yond the idle current draw See Phantom Power 48 V phantom can draw copious amounts of current out of the batteries depending on what model microphone is used Two phantom powered microphones draw twice as much curren
20. g power Condenser microphones require power for various parts of their operation including impedance converters preamplifier circuitry and in some cases to polarize mi crophone capsules The 302 can provide either phantom power or T power to each channel and is selected per channel If neither phantom or T power are required for in stance with dynamic microphones it is good practice to turn off microphone powering DYN PH fl T Phantom Power Basics Phantom powering is a fixed DC voltage between 12 and 48 volts This voltage is resistively applied to pin 2 and pin 3 of an XLR connector relative to pin 1 Note that as there is no voltage difference between the sig nal pins 2 and 3 a dynamic mic can operate just fine in the presence of phantom powering When phantom is selected the 302 can provide up to 10 mA to each input at 48 V sufficient for the most power hungry condenser microphones When acceptable using 12 V phantom is recommended to extend battery 302 Compact Production Mixer User Guide and Technical Information runtime Many microphones do not require 48 V phan tom and can be properly powered from 12 V phantom power The phantom voltage level is globally selected for all inputs either 12 V or 48 V Microphones draw differing amounts of current based on their design Many phantom powered mics will operate at 12 V with no difference in performance as compared to operating off of 48
21. ing from the rest of the circuitry Input CHANNELS The inputs of the 302 consist of three full featured microphone preamplifiers Each channel has a wide gain range to accommodate nearly all signal types The 302 easily accepts signals from low sensitivity ribbon and dynamic microphones medium level wireless and con denser mic outputs and hot line level signals 302 input channels are transformer balanced The isola tion characteristics of transformers are superior to other balancing techniques for the hostile and uncontrolled environments of field production Transformers pro vide galvanic isolation from the driving source mean ing there is no direct electrical connection Signals are transformed magnetically The input transformers in the 302 use premium magnetic core material to achieve high signal handling capability especially at low frequencies while keeping distortion to a minimum Because of their inherently high common mode imped ance transformers are unrivaled by any other type of input for common mode noise rejection The inputs of the 302 can be used balanced or unbal anced When unbalancing ground pin 3 to pin 1 of the XLR connector There is no change in gain between unbalanced and balanced connections into the 302 MIC LINE The Mic Line switch on the input panel is used to select the input level for each channel Taking into account all gain stages the 302 has up to 75 dB of available gai
22. input driven with 150 ohm source Outputs measured with 100k ohm load Temperature at 25 C Maximum Gain typical trim fader master phones RTN fully up Ohms Actual XLR Input XLR Input RTN Mic Setting Line Setting ch 4 5 XLR output factory line setting 75 dB 35 dB 20 dB XLR output attenuated 0 16 dB 40 to 56 dB 25 41 dB 2 dB steps 2 dB steps 2 OB steps Tape output TA3 type 61 dB 21 dB 6 dB Headphones 1 4 in and 1 8 in 95 dB 55 dB 30 dB Inputs impedance Type For use with Max Input Level XLR mic setting 2 5k transformer balanced lt 600 ohm mics 0 dBu 0 78 Vrms XLR line setting 16k transformer balanced lt 2k ohm outputs 40 dBu 80 Vrms Mix In 4 2k unbalanced stereo 302 442 Mix Out 1 8k 6 dBu 1 5 Vrms Return amp ch 4 5 10k unbalanced lt 2k ohm outputs 30 dBu Outputs Impedance MPN Ohms Actual Type For use with Max Output Level XLR factory Line setting 150 active balanced gt 600 ohm mics 20 dBu 7 8 Vrms XLR mic lowest setting 150 active balanced lt 2k ohm outputs 36 dBu Tape out mix out TA3 1 8k unbalanced stereo gt 6k ohm inputs 6 dBu 1 5 Vrms Headphones 1 8 inch 200 unbalanced stereo 8 2k ohm phones 20 dBu 7 8 Vrms Output Noise 100 dBu 102 dBV maximum 22 Hz 22 kHz band width flat filter master gain fully up faders fully down
23. ked as a stereo pair their channel limiters also link to perform the same gain reduction to both channels equally Each channel has an orange limiter LED which illuminates in proportion to the amount of limiting If the orange LED for a channel comes on regularly it is recommended to turn down the Gain page 8 Peak and Limit LEDs ee Each channel has an indication of peak signal activity When a channel approaches 3 dB below its clipping level the red Peak LED illuminates If the red Peak LED for a channel comes on often it is recommended to turn down the Gain The channel limiter LED will illuminate when the input limiter is active Polarity Reverse Channel 2 OFF Engaging the polarity reverse switch inverts the polarity of channel 2 Polarity reversal is often used to quickly reverse the stereo field in MS recording The normal position is OFF with polarity reversal occurring when the switch is in the position NOTE Be advised that an audible pop occurs when the polarity switch changes states Stereo Linking of Channels 1 and 2 Stereo linking allows input channels 1 and 2 to be controlled as a single stereo input This is useful when stereo microphones or stereo line level signals are used with the 302 and the operator wants a single knob for controlling the overall signal There are two modes of operation for stereo linking X Y link and MS stereo In both cases input channels 1 and 2
24. meras or recorders The tape output is isolated from the main output devices connected to the tape out have no effect on the master outputs The Tape Out is also used when linking the 302 to an other 302 mixer or Sound Devices 442 Field Mixer Using the XL 1 cable supplied with the 442 connect the 302 Mix Output to the 442 Mix In connection All three of the 302 inputs appear at the 442 master outputs Ourpur LIMITERS In addition to the limiters on each input channel the 302 has a software controlled limiter for the output buses Output limiters are used to prevent overload of recorders cameras and wireless transmitters connected to the 302 The output limiter on the 302 is a optoisola tor based peak limiting circuit Its threshold of opera tion is set in the User Menu The output limiter can be set in one of two positions Link or LIM OFF LIM LINK Link Stereo Operation When set in the link position the output limiter acts identically on each output bus If one output makes the limiter engage the other bus will follow suit This is very useful when using the 302 in stereo limiter opera tion will not affect the stereo image LIM Dual Mono When using each output bus separately the output limiter should be set to the ON position This position engages each output limiter separately They will act on each respective output bus independently of the other While all dynamics processing distorts
25. mp DEVICES lt factory setting sounD DEVICES
26. n from mic input to line output When in the LINE posi tion the input channel sensitivity is reduced by 40 dB Gain Trim Like traditional mixing consoles the 302 s microphone preamp gains are set via the gain control The gain or trim adjusts the input sensitivity of a channel input so that the channel fader can be set to operate in a usable range Once set the gain is typically kept at the set level and all mixing is done on the channel fader The gain adjustment features a pop up knob so that it can be ad justed easily and then hidden from the mixing surface Mic Line Level Selection SOUND S DEVICES While both the gain and the fader control the gain of a given channel the fader is the primary channel level control used in operation The gain can be thought of as a coarse gain adjustment to be adjusted during setup and the Fader is a fine level adjustment to be adjusted while recording With a properly set gain control the fader can be set to a nominal 0 unity level With the fader at unity the dynamic range of the mixer is maximized There is a wide range of control for the input allowing for smooth level changes with adequate control of attenuation and gain Faders Microphone Powering Phantom powering and T powering are methods of providing power to microphones by applying a voltage using the same wires that carry the audio signal The 302 produces phantom or T power for microphones requirin
27. nu To adjust values the meter brightness button left and the battery check button right allow selection among setup values Some setups have multiple values while others have only two values Setup Example The following steps show how to change the tone oscil lator frequency from the factory default of 1 kHz to 100 Hz 1 Enter the setup menu by holding down the PK VU button while powering the mixer 2 Press the PK VU button six times until the left meter LED is at the 16 position see Appendix SETUP MENU 3 To move among parameter values press the bright ness LED and battery check LED until the 100 Hz position is selected 24 LED 4 Press the PK VU button multiple times until the meters perform their scrolling dance This saves all parameter into memory SOUND S DEVICES To save new values to memory the PK VU button must be repeatedly pressed until the last setup is reached At that point the meters will scroll and the new values will be saved to memory User Default A memory location is available to store user defined de fault settings The user default is helpful to save a new baseline of settings different than the factory default settings To save a user default perform the following 1 Hold down both the meter brightness button and battery check button while powering the mixer 2 The current settings will be saved as the user de fault The user default settings can be recalled f
28. on w Tone tone oscillator is activated 2 External Battery 1 30 2 26 3 24 4 22 5 20 6 18 Selects the external DC range of the voltage Voltage Reference see voltage metering chart below check function and power LED flash point 0 Meter Ballistics Select VU PPM VU PPMHold VU PPM 30 Selects meter ballistics choices selected when tog PPM VU PPMHold VU PPM 26 gling the front panel meter ballistics switch VU VU PPM Hold VU PPM 24 PPM VU PPM 22 VU VU PPM 20 4 Master Peak LED 1 dB increments from 4 to 20 dBu level Sets the signal level where the 20 LED illumi Threshold Adjust shown on meter nates Used to set an alternate peak level 8 Slate Tone Switch Normal 30 reversed 26 tone only 24 Changes the functionality of the slate tone slate only 22 switch Switch can be defeated by engaging setup 14 and setup 12 12 Default Restore OFF 30 User Default 26 Factory 24 Resets setup menu to either the stored default or the factory values x High LED Flash Low Setting i Power Source r Voltage Point Voltage 8 4 5 3 4 3 0 Internal batteries S U 1 13 0 11 5 11 0 12 V NiCad NiMH Li etc ic D 2 17 0 11 5 11 0 Expanded range of setting 1 Or 3 8 5 5 75 5 5 6 V NiMH Li etc gt g 4 14 0 11 4 10 12V Lead Acid s 5 7 0 5 7 5 0 6V Lead Acid Full range of DC input with 6 12 0 13 5 0 cutoff iar 12V Ned etc sounnG a
29. pen 1 The dynamic range of the recording is maximized 2 All level metering can be done via the 302 s meter The recorder s level meter can be ignored since the only way for the recorder to clip is for the 302 to clip The 302 s meters match the recorder s meters in that the clip points match Because most recorder s meter ballistics and scale are different it is impossible to make the 302 meter exactly match a given recorder s meter However this is irrelevant if the clip levels match To facilitate matching the clipping levels of the 302 s output to the recorder s clip level the 302 includes a full scale tone output function Full scale is the same as clipping level To activate this full scale tone turn on the tone switch while in setup mode 1 Be ex tremely careful when doing this as a full scale tone is extremely loud and can hurt the operator s ears Make sure to turn down the headphone level and the level going to any amplifiers etc from the 302 The failsafe way to set proper levels is as follows 1 2 Connect 302 s XLR outputs to recording device Enter setup mode 1 see Setup Mode section 3 Turn down headphones and any amplifiers connect ed to the 302 s other outputs Turn on the tone oscillator via its switch 5 Turn the recording device s input gain control to its 10 SOUND S DEVICES detented point or half way if no detent Adjust the 3
30. que master output level adjust ment This can be thought of as a master level control which is placed after the output meters With this it is possible to make the 302 s meter correspond directly to the recorders meters By adjusting the attenuation level in the setup menu see Setup Menu for adjustment the output level of the 302 can be adjusted to anything from line level to microphone level Output levels are set depending on the device camera recorder trans mitter etc that the outputs are connected This control is ideal since the gain structure can be precisely set for a given piece of equipment 302 Compact Production Mixer User Guide and Technical Information When the output level is set to a level different than the factory default of Line the Output Attenuation LED on the output panel illuminates This is a quick reminder that the XLR output is not line level See Appendix C for more information on output attenuation and meter matching Tape Out Mix Output lt The 302 has an unbalanced two channel tape level out put on a single locking TA3 type connector Tape output program is identical to XLR output program although they are isolated from each other The 302 tape output page 9 is typically used to interface the 302 mixer with con sumer type inputs such as MiniDiscs DATs and compact cassette recorders The tape output is also used to feed wireless transmitters when the masters are connected to ca
31. rom the setup menu by applying the user default restore see setup menu Output Limiter Adjustment Output limiter thresholds are adjustable between 4 dBu and 20 dBu in 1 dB increments The threshold level is shown on the lower right meter string by illuminat ing LEDs Because LEDs are spaced every 4 dB a com bination of flashing and solid adjacent LEDs indicate limiter levels between the numbered LEDs Factory default is 20 dBu Each press of the battery button or meter brightness control changes the threshold by 1 dB Three possible LED indications show threhold value e Single solid LED actual value indicates threshold e Flashing LED next to a solid LED indicates that the threshold is one dB above or below the solid LED value e Two solid LEDs threshold value is even number value between the two indicated values Two examples are shown below a setting of 10 dBu and 11 dBu thresholds 4 8 12 16 29 4 8 12 16 29 ui ii both 8 and 12 LEDs 8 flashing and 12 solid indicates 10 dBu solid indicates 11 dBu limiter threshold limiter threshold 302 Compact Production Mixer page 13 User Guide and Technical Information SPECIFICATIONS Measurement settings unless otherwise specified Gain controls for the channel being measured at mid point all other channels gains fully down pan switches centered low cut off inputs in mic position outputs in line posi tion Mic
32. roper setup of sound sources and input devices is quick and easy with the 302 Follow the steps outlined below for basic interconnection Powering 1 Insert three AA batteries with side first into the mixer battery tube 2 Switch on the mixer power by sliding the power switch to INT The power LED will illuminate solid green with good batteries Interconnection 1 Connect the output XLR connectors of the 302 to the destination recorder camera or other input 2 Connect microphones or other signal sources to the input XLR connectors 3 Switch phantom or T power on as required by the microphones Setting Output Gain Structure 1 Determine the required input level of the destination If a line level connection is required no further output level adjustment is needed on the 302 If the input level requires less than line level such as microphone or a 10 dBu level adjust the master output level accordingly see Output Level Control 2 Turn on the 302 s tone oscillator Adjust the input sensitivity on the destination device so that the 302 output is at an average level with sufficient headroom to accommodate signal peaks For many digital cameras and recorders this is often a range between 20 and 12 dBfs as read on the recorder or camera s peak meter With analog devices running nominal levels near 0 VU is typical Setting Input Levels 1 Select the overall level mic or line for the input channel 2 Set the channel fader to
33. s perfectly feasible for both operation and backup with the 302 Power Switch and LED The 3 position power switch selects between internal batteries external DC or off Because of the power sup ply design of the 302 the unit takes approximately 10 seconds to fully stabilize its power supply after power up Additionally there is sufficient capacitance in the circuit to toggle between internal and external without disruption in audio The power LED illuminates solid green to indicate good power When the power source falls below the thresh old voltage see chart below the power LED begins to flash Once flashing changing the power source is recommended Internal Batteries The 302 uses a unique battery tube to hold 3 AA bat teries This robust tube is sealed to prevent any battery leakage from ruining the internal circuitry The thread ed nickel cap extends beyond the panel to make battery changes easy and quick In normal operation the battery compartment extends no farther than adjacent XLR con nectors Note Remove batteries when the unit is stored External DC Sources For extended mixer runtime use an external DC source The 302 can be powered from any DC source with a voltage range of 5 V to 18 V If using an AC DC trans former make certain its voltage falls in the 5 18 V range and can supply at least 4 watts If an over voltage is applied to the mixer an internal poly fuse is opened to prevent mixer damage The
34. signal and pin 1 for ground 28 Tape Out Mix Out 25 Output Attenuation LED Unbalanced stereo output on TA3 type connector When illuminated indicates that the XLR output Same program as master output Pin 1 ground connectors are set for a level other than the fac pin 2 left pin 3 right Also used to link to the tory default of line level See User Menu to set XLR Mix In of a 442 or 302 output levels 29 Return Channel 4 5 Input 26 Return Level Channel 4 5 Level Control Unbalanced stereo 1 8 inch input connector for Adjusts the gain of the return feed to balance pro return monitor audio 1 8 inch wired tip left ring gram and monitor signals in headphones right sleeve ground Connection used for inputs 4 amp 5 when selected in Setup Menu sounn G DEVICES page 6 30 Mix In An input to the master bus designed exclusively to link the Tape Out Mix Out of 302 442 MixPre or MP 2 to the 302 for additional inputs Pin 1 ground pin 2 left pin 3 right Shell of TA3 con nector must be grounded to pin 1 to open connec tion 31 Battery Tube Holds three AA batteries for internal powering 302 Compact Production Mixer User Guide and Technical Information Accepts alkaline and lithium cells or NiHM recharge able cells 32 DC Input Accepts DC voltages from 5 18 V for mixer power ing Four pin Hirose connector wired pin 4 positive pin 1 negative Ext DC is completely isolated float
35. sounn DEVICES popi mL i a m Que S 302 Compact Production Mixer User Guide and Technical Information Sound Devices LLC 300 Wengel Drive Reedsburg WI 53959 USA tel 608 524 0625 fax 608 524 0655 www sounddevices com info sounddevices com page 2 302 Compact Production Mixer User Guide and Technical Information he 302 is the essential portable mixer for production companies and camera operators wanting to take control of their audio The 302 is stunning in size flexibility control and performance it is the most compact and cost effective battery powered professional audio mixer in its class With important features to accommodate nearly any over the shoulder production the 302 can interface with any professional microphone wireless system or camera recorder input Its microphone inputs share the same superb circuitry of all Sound Devices field production tools With many of the controls of the flagship 442 mixer the 302 has a complete feature set in a compact functional design All controls are accessible on its three main surfaces The high efficiency power circuitry runs the mixer from either three internal AA batteries or external 5 18 VDC The 302 is part of Sound Devices family of field production audio tools which includes mixers preamplifiers com puter interfaces recorders and accessories TABLE OF CONTENTS Quick Start Checklist 3 The Meter asics 6 44502 aS 10 Powering H
36. t as one Microphones vary widely in their current draw depending on type and phantom voltage applied e Output drive level higher output drive levels into multiple low impedance inputs increases current draw e Headphone output circuit high headphone output levels increase current draw e Meter brightness current draw is slightly increased with higher illumination intensities Experimentation is recommended to determine battery life for each individual setup and application page 12 302 Compact Production Mixer User Guide and Technical Information THE Setup Menu The 302 has 18 available setup features see Appendix for Setup Chart Setups typically set and forget fea tures infrequently changed are easily accessed directly on mixer s the front panel Entering the Setup Menu Q oS Qe 2 D A Oz To access the setup menu perform the following steps 1 Turn off the mixer if already on 2 Depress and hold the Peak VU selection switch while switching power on 3 The setup mode is now enabled The mixer will not pass audio when in the setup menu When in the setup menu the left meter L position indicates the selected setup feature The right meter R position indicates the values selected for the setup Use the PK VU button advance from one setup to another If the intended feature is passed setup mode must be re entered since you can only step forward through the me
37. ter on the input otherwise damage to the microphone may occur Do not apply phantom power to T powered microphones NOTE Phantom and T powering are not interchange able Use T powering only for T powered microphones High Pass Filters 160 Each channel of the 302 has a two position high pass fil ter High pass or low cut low roll off filters are useful for removing excess low frequency energy in audio sig nals Wind noise is a common unwanted low frequency signal and a high pass filter is effective for reducing wind noise For most audio applications engaging the high pass filter is beneficial since little usable audio information exists below 80 Hz especially for speech reproduction sounnG DEVICES page 7 The 302 s high pass filters features a 12 dB octave slope with either 80 Hz or 160 Hz corner 3 dB frequen cies The 160 Hz settings can be used when aggressive filtering is required The 302 s high pass circuit is unique because of its placement before any electronic amplifi cation Most mixer s high pass circuits are placed after the mic preamp where all of the high energy low fre quency signals get amplified Because the 302 s circuit cuts low frequency signals before amplifying higher headroom is achieved in presence of signals with a lot of low frequency energy Where possible attempt to equalize at the sound source with microphone selection use of windscreens microphone plac
38. the channel limiter is operating and reducing channel gain to prevent overload 6 High Pass Filter Low Cut Three position switch engages the high pass shelv ing filter Used to reduce excessive low frequencies 12 dB per octave at 80 Hz or 160 Hz Center position is off 7 Polarity Reverse Switch Channel 2 When engaged the polarity of channel 2 is reverse 180 out of phase with respect to input channels one and three Useful to flip the stereo image when using MS stereo techniques 8 Stereo Link LED Channels 1 amp 2 Indicates that channels 1 and 2 are linked as a stereo pair Engaged via a user setup In L R stereo link channel 2 fader controls overall stereo level When in MS position channel 1 fader controls Mid channel 2 fader controls the amount of stereo side information 9 Limiter Switch Activates both input and output limiters ON is dual mono limiter operation LINK is stereo opera tion Output limiter threshold controlled in User Setup menu 10 11 12 13 14 15 16 17 18 SOUND S DEVICES 11 12 14 15 16 18 17 Output Meter Sunlight viewable 40 segment LED output meter indicates peak VU or combination peak VU output levels Calibrated in dBu when peak reading Meter Brightness Controls the brightness of the LED output meter Each push selects among four brightness levels Meter Ballistics Toggles among the available meter ballistic options VU
39. the unity gain position 3 Raise the gain control trim so that signal indicates on the mixer Monitoring 1 Connect headphones to the headphone connector located on the input panel 2 Set the headphone source to ST to monitor stereo program Raise the headphone volume level to the required level NOTE The 302 headphone output is capable of producing ear damaging levels Turn down levels before switching source 3 Monitor individual sources by moving the headphone selection switch to the 1 2 or 3 positions sounn G DEVICES page 4 302 Compact Production Mixer User Guide and Technical Information Front Pane DESCRIPTIONS 1 Gain Trim The coarse gain control Sets the input range so that fine gain control can be applied with the chan nel fader 2 Fader The primary control for adjusting gain during op eration Allows fine control over input levels 3 Pan Switch Assigns the input channel to the output bus Left only Center equal left and right or Right only 4 Peak LED When illuminated indicates that the channel is very near overload 5 Limiter LED When illuminated indicates that
40. vating the tone oscillator will output a full scale tone to aid in gain structure setup Slate Microphone The slate microphone is used to audibly notate scenes at the mixer location Its audio performance is not suitable for critical recording applications it should only be used for documenting scenes to tape The slate mic uses the momentary switch position In the Setup Menu a one second 400 Hz tone can be set to precede the slate microphone The slate microphone signal is sent to all outputs In the Setup Menu the slate microphone can be disabled to prevent unintended ac tivation Also the switch assignments of slate and tone can be reversed for convenience page 10 302 Compact Production Mixer User Guide and Technical Information HEADPHONE MOoniTORING The 302 has a flexible headphone circuit capable of selecting a variety of audio signals for listening in headphones Most professional headphones ranging in impedance from 8 ohms to 1000 ohms can be used with the 302 NOTE THE 302 IS CAPABLE OF PRODUCING EAR DAM AGING LEVELS IN HEADPHONES TURN DOWN THE HEADPHONE VOLUME BEFORE SELECTING A MONITOR ING SOURCE The headphone level control adjusts the overall volume sent to the headphones The level control adjusts both the left and right headphone outputs simultaneously M R ST HP 3 L RTN HP Monitor Selection O 1 Tent Ws Several signal sources can sent to the headphones The front panel rot
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