MCN Audio U1127 Manuel utilisateur

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

MCN AUDIO - U1127 - MICROPHONE PREAMPLIFIER

TABLE OF CONTENTS

GENERAL 2

WARRANTY 3

SPECIFICATIONS 4

SCHEMATIC 5

FRONT PANEL 6

REAR PANEL 7

INPUT AND OUTPUT LEVELS 8

GAIN 8

OSCILLATOR 8

BANDWIDTH 9

PHANTOM POWER 10

BATTERIES 11

BATTERY LIFE 12

POWER ADAPTER 13

INDEX 14

Due to permanent technical improvements, specifications listed here can change

without prior notification.

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. The low impedance of the floating balanced outputs allows the use of long

cables without signal loss.

This unit is the ideal complement of a DAT recorder or a Betacam camera for which it is an

alternative to high performance input stages. The extended bandwidth, the high signal to noise ratio

and the precision of the calibrated gain make it useful for acoustic measurements.

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.

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.

Supply phantom 48 V or 12 V switchable.

Connector XLR female.

OUTPUTS Transformerless electronically balanced.

Impedance 600 Ohms minimum.

Protection against phantom power.

short-circuit to ground.

Nominal level +4 dBm.

Maximum level +25 dBm under 600 Ohms.

Connector XLR male.

TRANSFER

Crosstalk A/B > 85 dB from 0 to 20 kHz.

Gain mismatch A/B < 0.2 dB from 20 Hz to 20 kHz.

Bandwidth 10 Hz to 30 kHz +/- 0.1 dB.

0.7 Hz to 70 kHz +/- 3 dB.

Low-cut filter selectable 20 Hz / 80 Hz / 140 Hz.

(first order)

Phase roll off < 1˚ from 20 Hz to 20 kHz (no filter selected).

Common mode rejection > 60 dB at 20 kHz / gain 10 dB.

> 88 dB at 20 kHz / gain 30 dB.

Input noise -112 dB / gain 10 dB / source 150 Ohms.

-130 dB / gain 30 dB / source 150 Ohms.

Distortion typical 0.0007 % at 1 kHz, nominal level.

OSCILLATOR

Frequency standard : 1000 Hz +/- 3 Hz.

option 01 : 800 Hz +/- 3 Hz.

Level standard : -12 dBm.

option 02 : 0 dBm.

Distortion typical 0.5 %

GENERAL

Power supply 8 alkaline battery 1.5 V AA/LR6.

External 12 V / 400 mA on LEMO connector.

Battery life expectancy minimum 8 hours permanent use.

(according to the type of the microphones

connected and temperature)

Pilot lights ON

EXT / external supply.

PEAK / -6 dB before saturation.

BATTERY LOW / battery exhausted.

Temperature -30 ˚C / +60 ˚C.

Case size 105 x 45 x 205 mm.

Weight 1150 g batteries included.

FILTER

IN A

IN B

OUT A

OUT B

OUTPUT

STAGE

OSCILLATOR

PREAMPLIFIER

+12V

+48V

MICROPHONE

POWER

OFF

OVERLOAD

DETECTION

DC/DC CONVERTEUR

EXTERNAL

POWER

BATTERIES

OFF

FILTER

20Hz

80Hz

140Hz

MCN AUDIO - U1127 - MICROPHONE PREAMPLIFIER

SCHEMATIC

A and B channels are identical.

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

3 pin XLR connector 2 Hot +

Pin 1 is connected to the metallic frame 3 Cold -

GAIN Gain selection applied to the input signal.

ON Rotary selector : ON/ OFF/ OSCillator

FILTER On the OFF position the unit is turned off.

On the ON position is turned on.

Microphone power is active.

No filter is active.

On the 20 Hz position, the 20 Hz filter is active.

On the 80 Hz position, the 80 Hz filter is active.

On the 130 Hz position, the 130 Hz filter is active.

On the OSC position, the signal of the oscillator is present at the output of the

preamplifier at the reference level.

The input signal is disconnected from the outputs. The Microphone power is still active.

The blue ON pilot light is lit when the unit is ON. It flashes when power is low.

The green EXT pilot light lights when the preamplifier is powered by an external power

source through the connector on the rear panel.

AChannel A overload pilot light

This led lights when the signal is 6dB below clipping, that is 14 dB at the output, or when

the signal of the internal filter is 6 dB below clipping.

BChannel B overload pilot light

This led lights when the signal is 6 dB below clipping, that is 14 dB at the output, or when

the signal of the internal filter is 6 dB below clipping.

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

3-pin male XLR connector 2 Hot +

Pin 1 is connected to the metallic frame. 3 Cold -

EXTERNAL External power-supply connector

POWER Connects to the U8111 power-supply.

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.

The output nominal level of the preamplifier is +4 dBm (0 dBm = 0.775 V)

The maximum output level is +20 dBm and clipping occurs at about +25 dBm. The overload led light

6 dB before maximum output level, that is +14 dBm. Thus, the headroom before clipping is 11 dB.

GAIN

The nominal output level of the preamplifier is +4 dBm. The real gain value is the value shown on the

gain selector plus 4 dB.

Switch Position Actual Gain

10 dB 14 dB

15 dB 19 dB

20 dB 24 dB

25 dB 29 dB

30 dB 34 dB

35 dB 39 dB

40 dB 44 dB

45 dB 49 dB

50 dB 54 dB

55 dB 59 dB

60 dB 64 dB

The gains are adjusted to a +/- 0.3 dB tolerance. The gain difference between channel Aand Bis

less than 0.2 dB.

OSCILLATOR

The frequency of the oscillator is adjusted to a +/- 3 Hz tolerance. The nominal output level of the

preamplifier being +4 dBm, the output level of the oscillator is increased by 4 dB. A 1.5% distortion is

normal.

Frequency :

standard 1000 Hz +/- 3Hz

option 01 800 Hz +/- 3Hz

Output Level :

standard -12 dBm (actual level -8 dBm)

option 02 0 dBm (actual level +4 dBm)

MCN AUDIO - U1127 - MICROPHONE PREAMPLIFIER

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 ˚ tolerance.

When omnidirectional microphones are used, the extent of the bandwidth allows a pick up of

infra-bass sounds generally produced by air conditioning of large halls or by wind during outdoor

recording.

Even though these sounds are outside the audible range, they can overload the input stage of the

preamplifier or the equipment to which it is connected.

Whatever the frequency of these signals, the overload led lights up at least 6 dB before overload of

the preamplifier. But they are no use to detect overload of equipment connected after the

preamplifier.

Thus is may be necessary to use a low-cut filter, or to use pressure gradient microphones which

hardly transcribe bass signals carried directly through the air. However these transducers are very

sensitive to both low frequency mechanical vibrations transmitted by contact and to air turbulence.

20 Hz, 80 Hz, 140 Hz Positions

In order to attenuate low frequencies, three low cut filters can be used. Depending on the position of

the selector, frequencies below 20 Hz, 80 Hz or 130 Hz are attenuated by a first order filter.

This filter uses an active electronic circuit and is based on a substractive principle.

This system keeps a very high signal to noise ratio even when a filter is activated. Overload led may

light up if the signal at the output of the filter is great, even in the absence of a signal at the output of

the preamplifier. These led light up 6 dB before the active filter maximal output level.

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