M-2b - Millennia
Contents
1. 5 PHANTOM POWER SELECT 48V Routes 48 VDC phantom voltage to the 3 pin XLR microphone inputs for use with all conventional phantom powered microphones If DC Option has been installed and this switch is not depressed the conventional front end becomes entirely DC coupled an ideal match for ribbon mics moving coil mics and so forth 6 POLARITY REVERSE PHASE Pushbutton switch which when depressed and corresponding LED is illuminated flips the microphone polarity output becomes 180 degrees out of phase with respect to the input When switch is not depressed microphone signal remains in phase from input to output 7 POWER SWITCH POWER Rocker switch for switching AC line power on and off NUN i An M 2b A WORD ABOUT DPA Br el amp Kj r MICROPHONES At present Danish Pro Audio formerly Br el amp Kjzr Pro Audio Division manufactures two families of 4000 series professional recording microphones One family is 48 VDC phantom powered the other is 130 VDC direct powered A primary difference between families 4003 4 vs 4006 7 is that the high voltage microphones are transformer less whereas the phantom powered varieties are transformer coupled Millennia Media has used both varieties exten sively with symphony orchestra choir jazz ensemble pop recording and so forth We have found the transformerless high voltage omni version to perform substantially better than its transformer coupled omni counte2. Conventional 3 pin female XLR input jacks for all balanced microphones Pin 1 is chassis ground pin 2 is positive phase audio signal pin 3 is negative phase audio signal Input imped ance is 3 800 ohms 2 DPA B amp K HIGH VOLTAGE 130V INPUTS optional Conventional 4 pin female XLR input jacks for use only with B amp K 4000 series high voltage audio microphones Pin 1 is chassis ground pin 2 is unused pin 3 is 130VDC pin 4 is audio signal Input impedance is 9 000 ohms 3 OUTPUTS Out 1 Left Out 2 Right Conventional 3 pin male XLR unbalanced outputs Pin 1 is chassis ground pin 2 is positive phase audio signal and pin 3 is audio ground Output impedance is 120 ohms 4 EARTH AUDIO GROUND JUM PER A barrier terminal which ties earth ground to audio ground If ground hum loops are experi enced when using the M 2b removing this jumper may help Removing this jumper will not compromise chassis earth ground integrity 5 AC VOLTAGE MAINS SELECTION 100 120 or 200 240 A power entry module with a removable fuse holder block This fuse holder block is selectable for 100 to 120 Volt or 200 to 240 Volt worldwide mains powering The fuse block contains two fuses one fuse isin series with the hot power line while the other fuse is in series with the neutral power line Both fuses must be installed To change the mains voltage selection remove IEC power connector and assure that the M 2b is not connected to mains
3. the operation and or maintenance of the equip ment described in this manual without the express written permission of M illennia M edia Inc Under copyright laws this manual may not be duplicated in whole or in part without the written consent of M illennia M edia Inc M 2b is a trademark of Millennia M edia Inc All other trademarks are property of their respective holders Serial numbers are located on the rear left side of each unit We suggest that you record the serial numbers in the space provided below Refer to it whenever you call an authorized M illennia M edia repair facility or the manufacturer M ake sure that you return your completed warranty card immediately Features and specifications subject to change without notice 1999 Millennia M edia Inc All rights reserved Serial Nos 3 SAY o M 2b cion SAFETY PRECAUTIONS For your safety and the safety of others be sure to read and understand all safety and opera tional instructions before attempting to use the M 2b WARNING The M 2b internal cir cuitry carries lethal voltages Carefully observe all warnings precautions and instructions on the M 2b and as described in the instructions supplied with the unit 1 WATER MOISTURE AND SPILLAGE Do not attempt to use the M 2b in near or around water or in unusually moist environments such as near a sink or swimming pool Prevent liquids or any other materials or objects from spilling or falling into the M 2b u
4. two pushbutton switches used to select the gain range of the M 2b preamplifier See below 3 for complete description 3 HIGH RANGE SWITCH HIGH GAIN RANGE The second of two pushbutton switches 2 and 3 used to select the gain range of the M 2b preamplifier These two pushbutton switches define three preamplifier gain ranges as follows a LOW RANGE When both switches 2 and 3 are not depressed and corresponding LEDs are not illuminated microphone preamplifier is set to Low Gain Range Low Gain Range is defined as approximately 14 dB to 26 dB adjustable by the Gain Trim control 1 above b MEDIUM RANGE When switch 2 is depressed and switch 3 is not depressed micro phone preamplifier is set to M edium Gain Range M edium Gain Range is defined as approxi mately 26 dB to 38 dB adjustable by the Gain Trim control 1 above c HIGH RANGE When switches 2 and 3 are both depressed and corresponding LEDs are both illuminated microphone preamplifier is set to High Gain Range High Gain Range is defined as approximately 38 dB to 50 dB adjustable by the Gain Trim control 1 above 4 HIGH VOLTAGE DPA B amp K MIC INPUT SELECT 130V Routes the optional DPA Bruel amp Kjaer microphone input to the microphone preamplifier High voltage supply is not effected by this switch e g the 130 VDC supply is always present on pin 3 of the optional four pin mic input XLR irrespective of where this switch is set
5. READ THISFIRST Any changes or modifications not expressly approved by MILLENNIA MEDIA INC could void your authority to operate this equipment under the CE or FCC rules 1 Copyright You acknowledge that no title to the intellectual property in the M 2b is trans ferred to you 2 Inspection Inspect packing boxes M 2b and cables for damage unusual marks or short ages It is your responsibility to report damage shortage or misshipments in a timely manner M illennia M edia and or its dealers will not be responsible for claims arising from damage in shipping nor will claims for shortage or misshipments be honored more than 10 days after ship date 3 Read this manual carefully and completely before attempting to use the M 2b Improper operation could result in damage to product It is the user s responsibility to understand the safe use and operation of this device 4 The shipping box of the M 2b system will include 1 Owner s M anual 2 M 2b 3 a UL approved power cord 4 Owner s Registration Card Fill out the Owner s Registration Card and return to Millennia M edia at your earliest ability The material contained in this manual consists of information that is property of M illennia M edia Inc and is intended solely for use by the purchasers of the equipment described in this manual M illennia M edia Inc expressly prohibits the duplication of any portion of this manual or the use thereof for any purpose other than
6. VAC to 240VAC 50 60H z selectable Fuses 2 required 2 ea 1A with 100 120VAC mains 5x20mm slow blow 250V 2 ea 500mA with 200 240V mains 5x20mm slow blow 250V Internal DC Power 350V 130V 48V 24V 12V Dimensions 19 W x 13 75 D x 3 5 H N et Weight 24 pounds Millennia M edia reserves the right to change specifications delivery and pricing without notice SAY o M 2b aici 10 WARRANTY M illennia M edia will repair this product free of charge in the USA in the event of defect of materials or workmanship for one 1 year following date of purchase This warranty is ex tended only to the original purchaser This limited warranty covers failures due only to defects in materials and workmanship which occur during normal intended use and does not cover damage which occurs in shipment or failures which are caused by products not supplied by M illennia M edia This limited warranty does not cover failures which arise from accident misuse abuse neglect mishandling misapplication faulty installation improper adjustment alteration or modification of product incompatibilities line power surges acts of God or service performed by anyone other than M illennia M edia or its authorized agent Vacuum tube failures are not covered under warranty LIMITS AND EXCLUSIONS There are no express warranties except as listed above M illennia M edia shall not be liable for special subsequent incidental consequential or punit
7. hould not attempt to repair or service this unit All servicing and or repairs should be referred to M illennia M edia If after reading all instructions precautions and warnings you have remaining questions please contact M illennia M edia directly before attempting to use your M 2b Retain this owner s manual as a record of your purchase to aid positive identification in the event of loss NUN i An M 2b QUICK START READ THIS The M 2b operates with lethal operating voltages the voltage inside the M 2b can kill you N ever under any circumstances remove the top cover Refer to a qualified electronics technician any and all servicing tube replacement and other operations which require the top cover to be removed Congratulations on your purchase of the M illennia M edia M 2b vacuum tube microphone preamplifier The M 2b is the result of meticulous listening tests on numerous circuit topol ogy and packaging designs Your M 2b is a finely tuned instrument intended for critical profes sional applications we feel it offers the world s most elegant vacuum tube mic preamplifica tion With the emergence of 24 bit digital audio recording engineers are faced with a new requirement for undistorted dynamic range The M 2b meets this challenge exceptionally well Before connecting power to the M 2b assure that the rear panel voltage selection fuse block switch is set correctly In the USA the M 2b is shipped with the v
8. ive damages including but not limited to damage to recordings microphones mixing consoles or any associated equipment down time costs loss of goodwill or claims of any party dealing with purchaser for such damages resulting from the use of this product All warranties express and implied including the warranties of merchantability and fitness for a particular purpose are limited to the applicable warranty period set forth above Some states do not allow the exclusion or limitation of incidental or consequential damages or length of time an implied warranty remains in effect As such the above exclusions may not apply This warranty gives you specific legal rights and you may also have other rights which can vary from state to state NUN i An M 2b MILLENNIA MEDIA INC 4200 B Day Spring Court Placerville CA 95667 9500 Web http www mil media com Email info mil media com T 530 647 0750 F 530 647 9921 The M 2b is hand crafted in USA M anual printed in USA M2B A 100 899 M 2b JE e Mijenors 11
9. nit 2 HEAT AND VENTILATION Be sureto allow adequate ventilation to M 2b and avoid using or installing unit in close proximity to heat sources such as heaters stoves radiators power amplifiers spotlights or other heat producing appliances or equipment 3 POWER SOURCESAND POWER CORD PROTECTION The M 2b Power Supply should be connected to a power source only of the type described in the operating instructions or as marked on the Power Supply Route the power cord so that it is not likely to be walked on or pinched by having objects placed on it Pay particular attention to plugs receptacles and the point where the AC power cord exits the M 2b 4 GROUNDING For your safety it is extremely important that the grounding pin of the 3 wire power cable in cluded with unit be inserted into a grounding type 3 pin power outlet If you are unable to insert the plug into an existing outlet contact an electrician to install a properly grounded 3 pin power outlet 5 DAMAGE REQUIRING SERVICE This unit should be repaired or serviced by qualified personnel whenever The AC power cord has been damaged or Objects have fallen or liquid has spilled into any M 2b unit or The unit does not function properly or exhibits a marked change in performance or The unit has been abused dropped or damaged or The unit has been exposed to rain or moisture 6 SERVICING Lethal voltages are found inside the M 2b chassis The user s
10. oltage selection block set to 100 120 VAC At this voltage setting a pair of 1 amp 5 x 20 mm slow blow fuses have been factory installed If you change the voltage selection block to 200 240 VAC usage be sure to change both fuses to 500 milliamp 0 5 amp slow blow types The M 2b enclosure measures 19 wide x 3 5 high x 13 75 deep and is designed for mounting into a standard 2U 19 equipment rack If the M 2b is mounted into a road case or other rack which is prone to strong vibration or shock it is recommended that the rear of the M 2b be supported or otherwise reinforced to withstand such conditions The M 2b requires adequate ventilation To assure proper air circulation and operation leave at least one rack screw space open above the M 2b chassis The M 2b is designed on acommon ground topology For high quality operation and for your own Safety and the safety of others do not defeat the purpose of the earth grounding pin on the A C power cord NOTE The M 2b is based on pure Class A all vacuum tube design Such topology performs best after reaching a stable warmed up condition All M 2b factory adjustments have been performed when unit is fully warmed up at least one half hour after turning unit on It is recommended that to achieve optimal sonic performance with the M 2b allow a warm up period of at least one half hour e SAY o M 2b micos M 2b REAR PANEL 1 CONVENTIONAL 48V INPUTS In 1 Left In 2 Right
11. ower frequencies When used with various grids numerous polar patterns and response curves can be achieved DPA offers a service of factory matching new pairs of high voltage 130 VDC microphones for tight stereo tracking of sensitivity and frequency response curves Millennia Media highly recommends this service and can assist customers in obtaining these microphones A high voltage microphone preamplifier upgrade is available for your M 2b at any time Please call the factory for details NUN i An M 2b M 2b TYPICAL MEASURED SPECIFICATIONS THD Noise 22 Hz 22 kHz lt 01 0 dBu Frequency Response 3 dB points 4Hzto 200 kHz M aximum Input Level 14 dB gain 20 dBu M aximum Output Level gt 35 dBu Input Impedance 3 800 ohms conventional mic input 9 000 ohms high voltage mic input Output Impedance 120 ohms Recommended Load important gt 2 000 ohms Noise 22 Hz 22 KHz 50 dB gain 116 dBu EIN 150 ohm source Common M ode Rejection Ratio gt 80 dB 100mV O 1 kHz XLR Polarity Pin 2 positive polarity Pin 1 ground Gain Ranging approximate Low Range 14 dB 26 dB M edium Range 26 dB 38 dB High Range 38 dB 50 dB Phase Reverse Switching Yes Phantom Switching Yes DPA B amp K Switching Yes optional Gain Range Switching Yes 3 ranges Gain Adjustment Conductive Plastic Rotary Potentiometer ELECTRO MECHANICAL SPECIFICATIONS Power Consumption 50 Watts nominal Power Requirements 100
12. power With a non conductive tool gently pry the fuse block away from the power entry module Remove the two fuses and replace both with type as shown below Slide out the internal PC Board assy turn it over and reinsert the PCB assy so that the desired AC mains voltage appears in the viewing window Double check that the fuses installed correspond to the AC mains voltage range which appears in the viewing window Gently push the fuse block back until flush and snug FUSES For 100 120 VAC mains use 5x20mm 1A slow blow 250V Littelfuse 218 or equivalent For 200 240 VAC mains use 5x20mm 500mA slow blow 250V Littelfuse 218 or equivalent 6 POWER ENTRY IEC Power Receptacle An IEC type AC line power receptacle for use with removable cords Use only the power cord provided with the M 2b unit or equivalent U L approved type SV SVT SJ or SIT AC power supply cord Do not defeat the third pin earth ground If ground lifting is desired remove the Earth Audio Ground J umper strap 3 NUN i An M 2b M 2b FRONT PANEL 1 GAIN TRIM GAIN TRIM 0 12 dB Conductive plastic rotary potentiometer offering a gain trim range of 12 dB Working in con sort with range switches 2 and 3 below the Gain Trim allows fine adjustment of micro phone gain When fully CCW there is no additional gain added 0 dB When fully CW an additional gain of approximately 12 dB is realized 2 MEDIUM RANGE SWITCH MEDIUM GAIN RANGE The first of
13. rpart The transformerless version 4003 sounds generally clearer and more true to the source especially during frequency and amplitude extensions And this is saying a lot considering that DPA s transformer coupled microphones sound ex tremely pure The following is a brief summary of DPA high voltage microphone products and specifications Most of this material is taken directly from DPA s documentation and is thought to be accu rate however Millennia Media assumes no responsibility for errors or subsequent changes in the following specifications Those desiring up to date information concerning DPA microphones should contact DPA directly Model 4003 4004 4012 Pattern OMNI OMNI CARDIOID Self Noise 15 dB a 24 dB a 19 dB a SPL max 154 dB SPL 168 dB SPL 168 dB SPL Freq Response 8 Hz 30 kHz 8 Hz 45 kHz 35 Hz 25 kHz Impedance lt 30 ohms lt 30 ohms lt 30 ohms Sensitivity 50mV Pa 10 mV Pa 9 mV Pa A number of options are available for the 4003 microphone One grid the 0777 provides superior omnidirectional response throughout the high frequencies Another grid the 0297 provides a high frequency presence boost The standard grid provides the most accurate re sponse on axis A development called the APE acoustic pressure equalizer tailors the 4003 to respond like vintage M 50 or newer TLM 50 microphones The various APE attachments boost mid to high frequencies arriving on axis without exhibiting proximity effect at l
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