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MICROPHONE PREAMPLIFIERS





U1126 / U1127 / U1140 / U1141




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TWO CHANNEL MICROPHONE PREAMPLIFIER DIGITAL OUTPUT




 
The U1141 is a 1U rack mounted high quality preamplifier designed for professional use.
 
It contains two channel preamplifiers optimized to process signals from low impedance dynamic or electrostatic microphones. A specific fully-balanced design is used from input to output, offering the lowest noise floor level even at the highest gain setting. Gain can be set from 10 dB to 60 dB for each channel. Low cut filters can be inserted on the signal path and adjusted to three different frequencies, from 20Hz to 140 Hz. When required, a 12 V or 48 V phantom power supply can be applied to the inputs.
The internal reference oscillator allows accurate setting of the nominal recording level.
A headphone monitoring output is available on the front panel, providing versatile control functions including Mono/Stereo/A&B and MS decoding.
The low impedance of the transformerless balance analog outputs allows the use of long cables with no signal degradation.
The high resolution analog to digital section is based on a 24 Bit converter. Thanks to a specific dithering algorithm associated with a high-stability internal clock, the digital output signal can be set to a 16, 20 or 24 bit resolution and a 44.1 kHz, 48 kHz or 96 kHz sample rate.
External clock synchronisation can also be selected. In such case, a dual stage internal phase loop will accurately lock to a word clock signal or a reference AES/EBU signal.
The exceptional bandwidth, the absence of phase alteration, the high signal to noise ratio as well as the precision of the gain settings make the U1141 a unique candidate for digital recording and acoustic measurements.



front panel



rear panel



   
SPECIFICATIONS
 A&B Analog Preamplifier Sections

INPUTS
Balanced Transformerless. Electronicallybalanced.
Impedance 4 kOhms // 200 pF +/- 5% 
8 kOhms // 100 pF +/- 5%		 Common value.
Differential value.
RF filter Included.  
Gain +10 / +20 / +30 / +40 / +50 / +60 dB Gain accuracy +/- 0.3 dB.
Low Cut Filter 20 Hz / 80 Hz / 130 Hz first order filter. Frequency accuracy +/- 10%,
defined for -3 dB points.
Maximum Level 24 V Peak/Peak / 21 dBm. Values above maximal level will cause input protection clamp to turn on.
Equivalent noise < -100 dBm @ 10 dB gain.
< -106 dBm @ 20 db gain.
< -113 dBm @ 30 dB gain.
< -115 dBm @ 40 dB gain.
< -116 dBm @ 50 dB gain.
< -116 dBm @ 60 dB gain. 		Input loaded by 600 Ohms source impedance.
Measured on 20 Hz / 20 kHz audio bandwidth.
Phantom 48 V, 12 V power supply +/- 10%
Selectable from front panel switch.
Connector XLR female.  

OUTPUTS
Balanced Transformerless. Electronically balanced.
Impedance 600 Ohms Typical value.
Protection Against phantom power supply.
Against short circuit to ground.		  
Nominal level +4 dBm  
Maximum level +20 dBm
 Defined for 0.5% distortion, 600 Ohm load.
+27 dBm
 Defined for 0.5% distortion, unloaded output.
DC Offset
 < 50 mV common mode value.
< 5 mV diff‚rential mode value.
For all gain settings.
Connector XLR male.  

TRANSFER
Crosstalk L/R > 90 dB From 10 to 20 kHz.
Gain missmatch A/B < 0.2 dB From 10 kHz to 20 kHz.
Bandwidth 20 Hz to 20 kHz @ +/- 0.1 dB.
10 Hz to 30 kHz @ +/- 0.2 dB.
0.7 Hz to 100 kHz @ +/- 3 dB.		 With no filter activated.
Low Cut Filter.
20 / 80 / 130 Hz first order, defined for -3 dB points.
 Sum Mode First order filter.
Phase shift < 5ø from 20 Hz to 20 kHz. With no filter activated.
Common mode rejection > 60 dB @ 20 kHz / gain 0 dB.
> 88 dB @ 20 kHz / gain 30 dB.		  
Distortion < 0.004% @ nominal level.  
Limitor Level -15 dBm
-4 dB Full Scale.		 On Analog Outputs.
On Digital Output.
 
 Digital Section

WORD CLOCK SYNCHRO INPUT
Minimal level 200 mV Peak/Peak. Values below 200 mV may cause synchro loss.
Maximal level
6 V Peak/Peak.
Values above 10 V may damage input stage.
Minimal frequency 30 kHz  
Maximal frequency
 100 kHz  
Impedance 75 Ohms +/- 5%
50 Ohms +/- 5%		 Selectable internally.
Structure Balanced. Transformer coupled.

AES/EBU SYNCHRO INPUT
Minimal level 200 mV Peak/Peak Values below 200 mV may cause synchro loss.
Maximal level 6 V Peak/Peak Values above 10 V may damage input stage.
Minimal frequency 44.1 kHz  
Maximal frequency 96 kHz  
Impedance 110 Ohms +/- 5%  
Structure Balanced. Transformer coupled.

AES/EBU DIGITAL OUTPUT
Nominal level 3 V Peak/Peak. On a 110 Ohms load.
Maximal level
6 V Peak/Peak.
 Unloaded.
Impedance 110 Ohms +/- 5%  
Structure Balanced. Transformer coupled.

A/D CONVERSION
Internal clock source 44.1 kHz / 48 kHz / 96 kHz Selectable from front panel switch.
AES/EBU clock source from 44.1 kHz to 96 kHz. Selectable from front panel switch.
Sample width 16 / 20 / 24 bits. Selectable from front panel switch. Resolutions of 16 and 20 bits are obtain from 24 bit converter, using dithering techniques to reduce truncature effects.
Calibration 0 dB Full scale.
-15 dB Full scale.		 @ +19 dBm on Analog outputs.
@ +4 dBm on Analog outputs.
Noise floor TBD  
 
 Common Section

MONITORING
Nominal level +13.9 dBm, 3.8 Vrms, 300 mW under 50 Ohms.
+18.7 dBm, 6.7 Vrms, 300 mW under 150 Ohms.
+21.7 dBm, 9.4 Vrms, 300 mW under 300 Ohms.
+21.7 dBm, 9.4 Vrms, 150 mW under 600 Ohms. 		Adjustable from front panel control.
Impedance < 0.5 Ohm @ 1 kHz.  
Matrix Function Stereo (Left=Channel A, Right=Channel B)
Mono (Sum A+B)
Left (Left=Right=Channel A)
Right (Left=Right=Channel B) 		Selectable from front panel switch.

OSCILLATOR
Distorsion < 0.1 % Typical value.
Frequency 1000 Hz +/-3 Hz
800 Hz +/- 3Hz		 Standard Value.
Option 01.
Level 0 dBm
-12 dBm		 Standard Value.
Option 02.
Noise Floor < - 70dB Measured on 20 Hz / 20 kHz audio bandwidth.

INDICATORS
Clipping -6 dB before Clipping Point Clipping defined for 1% output distorsion.
All internal stage outputs are monitored.
Limit Indicates that Limiter is in action.  
Calibration Indicates Converter Calibration in Progress. Flashing during analog to digital converter calibration process. Calibration is activated at power up, and after each changes on sampling frequency, bit width or clock source.
Power On Indicates Power Applied. Illuminated if all internal suply voltages are correct.

GENERAL
Temperature -20 / +50 øC Operating Unit.
Size 1U 19" Rack Mounted.
420x375x40 mm		  
Weight    

Download U1141 User's Manual - English  version
Download U1141 Short Form - English  version
Download U1141User's Manual - French  version
Due to permanent technical improvements, specifications listed here can change without prior notification.