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MixPre Compact Mixer 

12

Battery Power  

For internal power the MixPre uses two AA (LR6) 1.5-volt batteries. Differ-

ent batteries have different power capacities depending on their chemistry, 

age, operational temperature, and amount of current being drawn. Alkaline 

cells are a popular and cost-effective battery type. Lithium cells have higher 

power per cell with higher current draws and yield significantly longer bat-

tery life, at a cost premium. AA carbon cells and AA nickel-cadmium cells 

are not recommended battery types in the MixPre since these batteries have 

lower power capacity than other types and will result in very short service 

life. Temperature has a significant effect on the life of batteries. Lithium bat-

teries are significantly better than alkaline batteries at lower temperatures.

Current Draw  

The MixPre can vary significantly in the amount of current it draws. Sev-

eral functions of the MixPre directly affect current draw in different ways. 

The following list highlights the larger current drawing functions (listed 

from highest to lowest current draw). 
1.  

Phantom power

: the main source of extra MixPre current draw. (See 

Phantom Power) 48V 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 current as one. 

Microphones vary widely in their current draw depending on type and 

phantom voltage applied. 

2.  

Headphone output circuit

 - high headphone output levels increase cur-

rent draw. 

3.  

Meter illumination intensity

 - higher meter brightness increases current 

draw. The meter can be switched to low for battery conservation. 

4.  

Output drive level

 - higher output drive levels into low impedance 

inputs increases current draw. 

Experimentation is recommended to determine battery life for each indi-

vidual setup and application. The chart below can be used as a starting 

point to estimate battery life. 

Battery Type

Microphone Type 

Battery Life 

Eveready AA No. L91 

(lithium) 

2 dynamic handheld microphones, low meter, no headphones

11 hrs. 

Duracell AA MN 1500 

(alkaline) 

2 dynamic handheld microphones, low meter, low headphones 

6 hrs. 

Duracell AA MN 1500   2 condenser, 12-volt phantom powered microphones, normal 

meter intensity, normal headphone drive level 

4 hrs. 

Duracell AA MN 1500   2 studio condenser, 48-volt phantom powered microphones, 

super bright meter intensity, cranking headphones 

2 hrs. 

(Test conditions: 70° F, 42 dB of gain with an acoustic music source, 600 ohm load, +4 dBu output) 

Содержание MixPre

Страница 1: ... 2004 Sound Devices LLC Sound Devices LLC 300 Wengel Drive Reedsburg WI 53959 USA Ph 1 608 524 0625 Fax 1 608 524 0655 www sounddevices com MixPre Microphone Preamplifier User Guide and Technical Information ...

Страница 2: ...le portable mixer The MixPre has impressive audio performance and com prehensive features making it ideal for the front end of any studio or field production system Radio television and film production engineers value its compact size and ability to withstand environmental extremes The MixPre combines rugged mechanical and electrical construction compact size and high quality components for no compr...

Страница 3: ...w distortion characteristics Discrete 6 transistor balanced output drivers Headphone Monitoring High current headphone monitor circuit Headphone level control and peak indicator Level Metering Sunlight readable seven segment GaN LED output meters 3 position LED brightness switch Two color clip limiter activity LEDs per input channel Audio Limiters Unclippable input peak limiters via two stage opto...

Страница 4: ...ontrolled by momentary Slate Micro phone Switch Slate Microphone output appears at all outputs 5 Tone Oscillator Slate Microphone Switch Toggle switch activates a 1 kHz tone oscillator when switched to the left position and activates the slate microphone when in the right mo mentary position Microphone inputs are muted when tone or slate are activated 6 Output Level Meter Indicates peak output lev...

Страница 5: ...phone circuit Also illuminates 3 dB before clipping of either channel of Tape Return audio 12 POWER Switch Three position switch selects the power source The unit is powered from internal batteries when in the left position powered from external DC source when in the right position Center position is off 13 POWER LED Two color LED illuminates green when the unit is powered and changes to red when ...

Страница 6: ...ts 80 Hz or 160 Hz corner frequency filters 6 dB per octave Filters affect both inputs Center position of switch re moves filters from the signal path 17 Tape Output 3 5 mm TRS stereo output unbalanced can be used to feed consumer level DAT MiniDisc and CD recorders Tip left ring right sleeve ground 18 Tape Return Level Control Recessed potentiometers adjust Tape Return level feeding the Head phone ...

Страница 7: ... be monitored in the MixPre Headphone circuit Tip left ring right sleeve ground 23 Left and Right Line Level Outputs Active balanced XLR line level outputs 22 dBu peak output level Pin 2 hot pin 3 cold pin 1 ground To unbalance use pin 2 as signal and pin 1 as ground pin 3 should not be grounded 24 BATTERY Compartment MixPre operates on two AA batteries Insert positive end of batteries first 25 Ext...

Страница 8: ...robust line driving capability To drive unbal anced inputs pin 3 should not be connected When unbalancing the con nection the output level will be reduced by 6 dB The Tape Output is designed to feed consumer level devices such as com puter sound cards DAT or MiniDisc recorders and cassette recorders A cable wired with 3 5 mm TRS to 3 5 mm TRS or 3 5 mm TRS to Left Right phono RCA connectors is use...

Страница 9: ...requency energy in audio signals This excess energy can be caused by multiple sources including wind noise vibration unidi rectional proximity effect or high ambient noise levels The 80 Hz position is appropriate when recording general speech music and ambient sound The 160 Hz position is useful to enhance speech clarity The MixPre high pass circuit topology is unique in that the filters are placed...

Страница 10: ...etting The three position Limiter switch can be set to operate in either dual mono or stereo linked operation Dual mono operation ON switch position al lows each input to limit independently responding only to its input signal Stereo linked operation LINK switch position connects both limiters ensuring that the limiters control both channels identically This linking is important for stereo operati...

Страница 11: ...imal current draw under all lighting conditions including direct sunlight The front panel Meter Bright ness switch controls the meter brightness low normal or super bright The meter indicates a signal range of 46 dB From left to right the first three LED s are separated by 15 dB and the next four LED s are separated by 4 dB This calibration provides a large dynamic range with good resolution in the...

Страница 12: ...m Power 48V 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 current as one Microphones vary widely in their current draw depending on type and phantom voltage applied 2 Headphone output circuit high headphone output levels increase cur rent draw 3 Meter illumination intensity higher meter...

Страница 13: ...50 Input XLR Transformer balanced 2k ohm input imped ance Input Tape In to Headphone Output Unbalanced 1 meg ohm input impedance Outputs XLR Active balanced 120 ohm output imped ance Tape 3 5 mm Unbalanced tip left ring right sleeve ground 2 1k ohm output impedance High Pass Filters 80 Hz or 160 Hz switch selectable 6 dB per octave Phantom Power 15 V through 680 ohm resistors or 48 V through 6 8k ...

Страница 14: ... kHz amplitude IEC1000 4 3 1995 modulation EN61000 4 4 1995 EFT Burst I O lines 25 kV to 1 0 kV IEC1000 4 4 1995 EN61000 4 6 1996 Conducted RF Immunity 10 V 80 1 kHz amplitude modulation IEC1000 4 6 1996 Tested by L S Compliance Inc Cedarburg Wisconsin December 16 1999 Matthew Anderson Director of Engineering Power LED Green indicates power and good battery Red indicates power and low battery LED ...

Страница 15: ...ransferable warranty that extends only to the original purchaser Sound Devices LLC will repair or replace the product at its discretion at no charge Warranty claims due to severe service conditions will be addressed on an individual basis THE WAR RANTY AND REMEDIES SET FORTH ABOVE ARE EXCLUSIVE SOUND DEVICES LLC DISCLAIMS ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING WARRANTIES OF MERCHANTABIL...

Страница 16: ...MixPre User Guide ...

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