User manual MILLENNIA M2-B

[. . . ] The material contained in this manual consists of information that is property of Millennia Media, Inc. and is intended solely for use by the purchasers of the equipment described in this manual. expressly prohibits the duplication of any portion of this manual or the use thereof for any purpose other than the operation and/or maintenance of the equipment described in this manual without the express written permission of Millennia Media, Inc. . Under copyright laws, this manual may not be duplicated in whole or in part without the written consent of Millennia Media, Inc. . [. . . ] In the USA, the M-2b is shipped with the voltage 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. To assure proper air circulation and operation, leave at least one rack screw space open above the M-2b chassis. 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. M-2b 4 M-2b REAR PANEL (1) CONVENTIONAL (+48V) INPUTS "In 1 (Left), In 2 (Right)" 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 impedance is 3, 800 ohms. (2) DPA (B&K) HIGH VOLTAGE (+130V) INPUTS -- optional Conventional 4-pin female XLR input jacks for use only with B&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 JUMPER A barrier terminal which ties earth ground to audio ground. If ground "hum" loops are experienced 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 is in series with the hot power line while the other fuse is in series with the neutral power line. To change the mains voltage selection, remove IEC power connector and assure that the M-2b is not connected to mains power. With a non-conductive tool, gently pry the fuse block away from the power entry module. [. . . ] Gain Adjustment < . 01% @ +0 dBu 4 Hz to 200 kHz +20 dBu > +35 dBu 3, 800 ohms (conventional mic input) 9, 000 ohms (high voltage mic input) 120 ohms > 2, 000 ohms -116 dBu EIN, 150 ohm source > 80 dB, 100mV @ 1 kHz Pin 2 positive polarity, Pin 1 = ground Low Range: 14 dB - 26 dB Medium Range: 26 dB - 38 dB High Range: 38 dB - 50 dB Yes Yes Yes, optional Yes, 3 ranges Conductive Plastic Rotary Potentiometer ELECTRO-MECHANICAL SPECIFICATIONS Power Consumption Power Requirements Fuses (2 required) 50 Watts, nominal 100VAC to 240VAC, 50/60Hz, selectable 2 ea 1A with 100-120VAC mains (5x20mm, slow-blow, 250V) 2 ea 500mA with 200-240V mains (5x20mm, slow-blow, 250V) +350V +130V +48V -24V +12V , , , , 19" W x 13. 75" D x 3. 5" H 24 pounds Internal DC Power Dimensions Net Weight Millennia Media reserves the right to change specifications, delivery, and pricing without notice. M-2b 10 WARRANTY Millennia Media 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 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 Millennia Media. 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 Millennia Media or its authorized agent. Vacuum tube failures are not covered under warranty. LIMITS AND EXCLUSIONS There are no express warranties except as listed above. [. . . ]