MM-1 User Guide and Technical Information
Contents
1. 5 ies O E lt ad h b o amp a i o 20 50 100 200 500 1k 2k 5k 10k 20k 50k 100k Input Mic www sounddevices com Transformer balanced 2k ohm input impedance Input Monitor Electronically balanced 22k ohm input impedance Output Line Transformer balanced 130 ohm output impedance Headphone Output Impedance Unbalanced 200 ohms Frequency Response Monitor In 10 Hz 50 kHz 0 5 dB gain at 50 Frequency Response Headphone Out 10 Hz 50 kHz 0 5 dB gain at 50 Input Clipping Level Monitor In greater than 30 dBu High Pass Filter 80 Hz or 160 Hz switch selectable 6 dB per octave Phantom Power 12 V or 48 V switch selectable will supply 10 mA per DIN 45 596 specification T Power 12 V via 180 ohm resistors will supply 10 mA Limiter Limits to 17 dBu output level 10 1 limiting ratio 5 ms attack time 100 ms release time Amber Red LED indicates limiting clipping Internal Voltage Rails 15 V regulated Internal 2 x AA batteries External 5 17 VDC via threaded coaxial jack 5 5 mm outer diameter 2 1 mm inner diameter pin positive sleeve negative Voltages above 17 VDC cause no damage to unit but will open an internal poly fuse Poly fuse will reset when voltage is removed Polarity All inputs to all outputs are non inverting X2. In the set up above the announcer has level control in the headphones of their overall audio level and the level of the mix minus feed Podium Microphones Often podium microphones need to carry long cable lengths and see multiple audio consoles Using an MM 1 between podium microphones and mixing con soles provides needed isolation for the microphone Because the MM 1 has transformer coupling for both inputs and outputs the potential for ground loops is substantially reduced Driving line level signals to mixing consoles and power ing microphones locally greatly improves the reliability and audio quality of a podium mic feeds The microphone is connected directly to the MM 1 which provides gain microphone power filtering and limiting In addition the micro phone signal can be verified using the headphone output of the MM 1 page 11 MM 1 Mic Preamp with Headphone Monitor User Guide and Technical Documentation FCC Statement This device has been tested and found to comply with the lim its for a class B digital device pursuant to part 15 of the FCC rules These limits are designed to provide reasonable protec tion against harmful interference in a residential installation This equipment generates uses and can radiate radio fre quency 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 interfer ence w
3. filter on the MM 1 will give an additive effect increasing the slope of the filter Limiter The MM 1 has a built in peak responding limiter which can be turned on or off by the front panel switch The MM 1 limiter is two separate limiters circuits activated by the one switch the first limiter keeps the input gain stage from clipping and the second limiter limits the output to 17 dBu The two limiters enable the MM 1 to limit in excess of 50 dB meaning that it is very difficult to clip the unit no matter the gain setting The Limiter LED on the front panel illuminates amber in proportion to the amount of limiting Headphone Monitoring With headphones connected to the front panel headphone jack the MM 1 can be used to monitor either microphone audio monitor audio or a mix of both signals The Phones level controls the overall headphone volume The Monitor Gain adjusts the level of the monitor input signal The MM 1 is capable of driving headphones to dangerously high levels Take precautions to prevent hearing damage Battery Life Several factors affect battery life including battery chemistry ambient tem perature of operation microphone powering and headphone drive levels Experimentation is recommended to determine battery life for each individual setup Note Nickel cadmium batteries are not recommended in the MM 1 since these batteries have lower energy per cell than other types and will result in very short service B
4. use 48 volt phantom Consult your microphone documentation for the appropriate voltage Dynamic microphones do not require phantom power A properly connected bal anced dynamic microphone will not be affected by the presence of phantom power nor will it draw any current However it is good practice to turn phantom power off if the microphone cable is suspect Poor or incorrectly wired micro phone cable can cause audible artifacts in the microphone signal Phantom is an excellent cable tester T powering is a specific powering topology needed only for T powered microphones T power electrically is 12 volts applied to pin 2 with respect to pin 3 of the XLR connector Because of the voltage differential of T power it is incompatible with dynamic or phantom powered microphones and can perma nently damage dynamic and phantom powered mics High Pass Filter The two positions of the high pass filter low cut in the MM 1 are useful for removing excess low frequency energy in the audio signals 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 high pass filter is a sin gle pole design 6 dB per octave page 8 www sounddevices com When possible attempt to equalize at the sound source with microphone selection use of a windscreen microphone placement and onboard micro phone filtering A high pass filter on the microphone and a high pass
5. LR pin 2 hot pin 3 cold pin 1 is ground TRS Tip hot ring cold sleeve ground Weight unit only Dimensions unit only Included Accessories 0 64 kg 1 42 Ibs 49 mm x 95 mm x 166 mm h x w x d 1 95 x 3 75 x 6 55 Mating DC power connector 4 rubber feet page 5 MM 1 Mic Preamp with Headphone Monitor User Guide and Technical Documentation Front Panel Controls and Connectors A PREAMP GAIN dB A 1 we Ae 9 f MM 1 is ROY 2 34 5 6 7 8 1 PREAMP GAIN Switch Rotary Selects the amount of gain from input to output adjustable in 11 increments 2 High Pass Filter Switch Three position switch inserts an 80 Hz or 160 Hz corner frequency filter 6 dB per octave Off position removes the filter from the sig nal path 3 LIMITER Switch Activates the peak limiter Limits to 17 dBu output 4 LIMITER Peak LED Bi color LED illuminates red at 3 dB below clipping illuminates amber to indicate limiter activity 5 MONITOR In Gain Controls the level of Monitor Input signal 6 PHONES Gain Controls the overall headphone monitor level of both preamp audio and monitor audio 7 POWER LED Bi color LED illuminates green when the unit is powered and changes to red when approximately four hours of battery life remain 8 POWER Switch Selects the power source for the unit either Internal battery or External power 9 Headphone Connector 1 4 inch TRS mono headphone out
6. SOUND S DEVICES MM 1 Microphone Preamplifier with Headphone Monitor User Guide and Technical Information Sound Devices LLC 300 Wengel Drive Reedsburg WI 53959 USA Voice 608 524 0625 Fax 608 524 0655 www sounddevices com 2001 2002 Sound Devices LLC MM 1 Mic Preamp with Headphone Monitor User Guide and Technical Documentation General Description Sound Devices MM 1 combines a high performance microphone preamplifier with a flexible headphone monitor The full featured transformer balanced microphone preamp produces low noise low distortion gain at all switch positions Its dual stage limiter and high pass filter prevent occasional sig nal extremes from overloading down stream equipment The MM 1 is at home in a range of applications film sound boom operators high definition television production corpo rate industrial environments radio television announce booths and music production With its headphone monitoring function the MM 1 is a benefit in applications where communications channels and mix minus feeds need to be monitored in head phones The user can monitor both microphone audio and external audio sources in headphones with level control The MM 1 is designed for durabily Its extruded aluminum chas sis rugged end panels machined knobs and panel mounted connectors assure reliable mechanical operation page 2 www sounddevices com Features High Performance Microphone Pr
7. attery Type Operational Characteristics Battery Life Duracell AA MN Powered idle XX hrs Duracell AA MN Dynamic microphone 4dBu output XX hrs 75 ohm headphones at moderate level Duracell AA MN Condenser microphone 48V 75 XX hrs 1500 ohm headphones at high levels 1600 mAh NiMH Dynamic microphone 4dBu output XX hrs AA 75 ohm headphones at moderate level 4 s 16 p QZ SuOnIpUod S L ge fet Q o wo MM 1 Mic Preamp with Headphone Monitor User Guide and Technical Documentation Application Notes Line Driving Mic Checking Audio from remote microphones located more than 100 meters from a mixing console improve when sending line level signals to the mix position Long cable runs at microphone level are more prone to noise and interference than line level signals Phantom voltages can also drop over long cable runs resulting in problems at the microphone The MM 1 can be used to step micro phone signals to line level provide power to microphones transformer isolate grounds and to verify microphone audio in headphones Wireless Boom Operator The MM 1 can be used to allow a boom operator to have an un tethered con nection to a production van or mix position The microphone is connected directly to the MM 1 and the boom op can hear microphone audio directly in headphones The MM 1 is used to power the microphone and provide gain The output of the MM 1 is connected to a body pack wireless
8. eamplifier Maximum of 66 dB of gain in eleven discrete steps for accurate repeatable gain settings Dynamic range exceeding 120 dB 10 Hz to 50 kHz audio bandwidth High immunity to RF interference due to transformers RF filtering and all metal construction High current line output driver capable of driving very long cable runs Premium Lundahl input transformer with superior sonic quality and freedom from interference problems Extended range peak limiter via dual opto isolators makes pream plifier virtually unclippable Selectable 48 volt 12 volt phantom power or 12 volt T power for condenser microphones High pass filter with two selectable corner frequencies 80 and 160 Hz 6 dB per octave Headphone Monitoring Headphone monitoring of microphone audio external monitor audio or a mix of both Monitor input accepts balanced or unbalanced mono line level inputs on 1 4 inch tip ring sleeve connector Separate level control of Monitor gain and overall headphone gain Split ear function via DIP switches Portable Internal battery power two AA for convenient low cost power Excellent battery life with alkaline or lithium primary cells External 5 17 VDC powering plug included Durable Mechanical Construction High strength aluminum chassis withstands punishing field condi tions Panel mounted connectors for strength and reliability Easy access battery compartment for quick battery changes Durab
9. ic Preamp with Headphone Monitor User Guide and Technical Documentation Operational Notes Transformers The isolation characteristics of transformers are superior to any other balancing technique particularly for the adverse and uncontrolled environments of field production Transformers provide galvanic isolation from the driving source meaning there is no direct electrical connection Signals are transformed mag netically Both transformers in the MM 1 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 impedance transformers are unrivaled by any other type of input for common mode noise rejection Both the microphone input and line output of the MM 1 can be balanced or unbalanced without problems When unbalancing either input or output ground pin 3 to pin 1 There is no change in gain with an unbalanced connec tion into or out of the MM 1 Microphone Powering Microphones requiring phantom power should use the lowest voltage acceptable to maximize battery life Most electret condenser microphones can operate on phantom voltages from 11 52 volts There is typically no performance benefit to using 48 volts therefore 12 volt phantom is appropriate Some microphones which require 48 volt phantom will not operate or may operate with lower headroom and increased distortion at 12 volts therefore
10. ill not occur in a particular installation Warranty Sound Devices LLC warrants the MM 1 Microphone Preamp with Headphone Monitoring against defects in materials and workmanship for a period of ONE 1 year from date of origi nal 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 Warranty claims due to severe service conditions will be addressed on an individual basis THE WARRANTY AND REME DIES SET FORTH ABOVE ARE EXCLUSIVE SOUND DEVICES LLC DISCLAIMS ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SOUND DEVICES LLC IS NOT RESPONSIBLE FOR SPECIAL INCIDEN TAL OR CONSEQUENTIAL DAMAGES ARISING FROM ANY BREACH OF WARRANTY OR UNDER ANY OTHER LEGAL THEO RY Because some jurisdictions do not permit the exclusion or limitations set forth above they may not apply in all cases For all service including warranty repair please send the MM 1 along with proof of purchase date to Sound Devices LLC Service Repair 300 Wengel Drive Reedsburg WI 53959 USA telephone 608 524 0625 page 12
11. le belt clip and end panels page 3 MM 1 Mic Preamp with Headphone Monitor User Guide and Technical Documentation MON IN Gain Mic Line Block Diagram PREAMP GAIN MIC LINE IN OUT SAS S 2 B LIM S3 B PHONES enve S2 A We PHONES lea oe MON GAIN S3 A Specifications 0 dB to 66 GB input to output switch selectable Gain Accuracy 0 6 0 1 dB with reference to front panel gain markings Mic Line 150 ohm source 100 k load impedances Frequency Response 20 Hz 20 kHz 0 1 0 5 dB 1 dB at 50 kHz Mic Line relative to 1 kHz level with 150 ohm source Equivalent Input 126 dBu 128 dBV maximum Noise 150 ohm source flat weighting 22 Hz 22 kHz bandwidth Mic gain setting 36 dB or greater Output Clipping Level Line 22 dBu minimum with 100k ohm load 20 dBu minimum with 600 ohm load Input Clipping Level Mic 4 dBu minimum at the 0 or 18 dB gain setting Dynamic Range Mic to Line 122 dB minimum at the 18 dB gain setting THD Noise 0 05 maximum from 50 Hz 22 kHz 4 dBu output level 22 Hz 22 kHz filter bandwidth 46 dB gain setting Common Mode Rejection Ratio 100 dB minimum at 80 Hz 60 dB minimum at 10 kHz MM 1 Frequency Response cma w 80 Hz HP w 160 Hz HP page 4
12. put microphone audio and or monitor audio in headphones page 6 10 11 12 13 14 15 16 17 www sounddevices com Back Panel Controls and Connectors BALANCED MON IN OC O 1 LINE OUT Transformer balanced line level output 22 dBu peak output level MIC IN Transformer balanced XLR input accepts microphone level signals Phantom Voltage Switch Selects phantom voltages between 48 V or 12 V for mic powering Balanced Monitor Input Active balanced inch connector accepts balanced or unbalanced line level signals from 10 dBu to 24 dBu Microphone Power Switch Three position switch selects Phantom power T power 12 Volts or no power DYN position WARNING Do not use T power with phantom powered or dynamic microphones see Microphone Powering External DC Input Connector Accepts 5 17 VDC pin sleeve BATTERY Compartment Requires two AA batteries for operation Insert positive end of battery first Bottom Panel Switches N The bottom panel switches are accessible ae when the belt clip is removed Use a 1 16 inch allen head wrench DIP Switches The Split Ear setting allows the a signal to be sent to the left headphone earpiece and a monitor signal to be sent to the right earpiece Also S2 B can mute the mic audio to the headphones page 7 MM 1 M
13. transmitter A two way radio s earpiece output is connected to the monitor input of the MM 1 Via the two way the boom operator receives director s cues The MM 1 allows the user to control monitoring levels of the comm feed and the microphone signal in headphones without affecting the microphone signal sent to the wireless transmitter KON ie 9 MONITOR PHONES 26 s GAIN 1 2a se 18 62 o e 2 oN ale ono O O wren Lm MM 1 POWER Boom Operator page 10 www sounddevices com Radio Television Announcer Position The MM 1 is used as a microphone preamplifier for an announcer s microphone and can pass a mix minus headphone feed to the announcer Sending a line level signal from the announcer position to the main mixing console is pre ferred over sending a mic level signal When engaged the limiter prevents dis tortion during shouting and high microphone signal levels PREAMP GAN TAB z pe MONITOR PHONES 2 i 58 18 62 o J8 Q Q 5 E y oF oF O O med N jm LIM MM 1 POWER j z Announcer announce ae 220000 ao To Announce lt lt t oco0000 000000 yy MIXING CONSOLE LINE UT mic ae mix minus
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