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Summary of Contents for MCN Audio U1127
- Page 1 MCN AUDIO U1127 STEREO MICROPHONE PREAMPLIFIER USER’S MANUAL OPTIONS Standard Oscillator 1000 Hz Standard Oscillator -12 dB Option 01 Oscillator 800 Hz Option 02 Oscillator 0 dB ACCESSORIES U8111 External Power Block 12 V / 1 A SERIAL NUMBER...
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Page 2: Table Of Contents
MCN AUDIO - U1127 - MICROPHONE PREAMPLIFIER TABLE OF CONTENTS GENERAL WARRANTY SPECIFICATIONS SCHEMATIC FRONT PANEL REAR PANEL INPUT AND OUTPUT LEVELS GAIN OSCILLATOR BANDWIDTH PHANTOM POWER BATTERIES BATTERY LIFE POWER ADAPTER INDEX Due to permanent technical improvements, specifications listed here can change... -
Page 3: General
MCN AUDIO - U1127 - MICROPHONE PREAMPLIFIER GENERAL The U1127 is a high quality, compact microphone preamplifier designed for professional use. It can handle dynamic or electrostatic microphone level signals. For the later a 12 V or 48 V phantom power can be supplied. -
Page 4: Warranty
MCN AUDIO - U1127 - MICROPHONE PREAMPLIFIER WARRANTY This equipment is warranted against defects in material and workmanship for a period of five (5) years from date of delivery. The warranty will be voided if the unit is tampered with or serviced by unauthorized personnel. -
Page 5: Specifications
MCN AUDIO - U1127 - MICROPHONE PREAMPLIFIER SPECIFICATIONS INPUTS Transformerless electronically balanced Impedance 7710 Ohms // 220pF (differential). RF Filter included. Gain +10 / +20 / +30 / +40 / +50 / +60 dB. Maximum level +20.8 dBm, 12 Volts peak. -
Page 6: Schematic
MCN AUDIO - U1127 - MICROPHONE PREAMPLIFIER SCHEMATIC OSCILLATOR OUTPUT OUT A IN A STAGE OUT B IN B FILTER PREAMPLIFIER 20Hz 80Hz 140Hz OVERLOAD FILTER DETECTION MICROPHONE +12V +48V POWER DC/DC CONVERTEUR EXTERNAL POWER BATTERIES A and B channels are identical. -
Page 7: Front Panel
MCN AUDIO - U1127 - MICROPHONE PREAMPLIFIER FRONT PANEL IN A Channel A input 1 Ground 3 pin XLR connector 2 Hot + Pin 1 is connected to the metallic frame 3 Cold - IN B Channel B input 1 Ground... -
Page 8: Rear Panel
MCN AUDIO - U1127 - MICROPHONE PREAMPLIFIER REAR PANEL OUT A Channel A output 1 Ground 3-pin male XLR connector 2 Hot + Pin 1 is connected to the metallic frame. 3 Cold - OUT B Channel B output 1 Ground... -
Page 9: Input And Output Levels
MCN AUDIO - U1127 - MICROPHONE PREAMPLIFIER INPUT AND OUTPUT LEVELS The maximum input level is 20.8 dBm. Above this level the input-protection-system limits the signal. In this mode the input impedance drops to about 200 Ohms. This system is designed to limit the transient that is cause when the microphones are connected or disconnected while the phantom power is active. -
Page 10: Bandwidth
BANDWIDTH ON Position When no low-cut filter is active, the bandwidth of the U1127 is deliberately very large, so as to minimize gain differences, phase rotations which normally occur at the end of the audible range. In this mode between 20 Hz and 20 kHz, gain remains constant with a +/- 0.005 dB tolerance and phase remains constant with a +/- 1 ˚... -
Page 11: Phantom Power
MCN AUDIO - U1127 - MICROPHONE PREAMPLIFIER PHANTOM POWER Phantom power integrated in the U1127 preamplifier can be switched to either 12 V or 48 V depending on the microphone used, or switched off altogether. The factory default is phantom power active and set to 48 V. -
Page 12: Batteries
MCN AUDIO - U1127 - MICROPHONE PREAMPLIFIER BATTERIES To replace batteries: • Open the battery compartment using a coin to turn the lock. • Remove the compartment lid. • Insert 8 1.5 Volt-LR6/AA/AM3-alkalin-batteries in the compartment. Place the ribbon beneath the batteries, it will aid the easy removal of the batteries. -
Page 13: Battery Life
Note that using the U8111 external power adapter does not recharge the batteries placed in the battery compartment. The power converter circuit inside the U1127 preamplifier has been designed to run normally until the batteries are completely drained. Thus, used batteries should not be left inside the preamplifier as the could leak and greatly damage the circuits of the preamplifier. -
Page 14: Power Adapter
MCN AUDIO - U1127 - MICROPHONE PREAMPLIFIER U8111 POWER ADAPTER The U8111 power adapter allows use of a U1127 preamplifier with an external power source. It is connected to the EXTERNAL POWER inlet on the preamplifier rear panel. It is not necessary to remove the batteries when the preamplifier is run on external power. -
Page 15: Index
MCN AUDIO - U1127 - MICROPHONE PREAMPLIFIER INDEX A, 6 Maximum input level, 8 Alkaline batteries, 12 Maximum output level, 8 B, 6 Nickel-Cadmium battery, 11 BANDWIDTH, 9 Nominal output level, 8 BATTERIES, 11 BATTERY LIFE, 12 ON, 6, 9... - Page 16 MCN AUDIO - U1127 - MICROPHONE PREAMPLIFIER MCN AUDIO On line: www.mcn-audio.com Document Code : UM-EV-U1127A-V...
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