Electrical Characteristics
ToolKit
Input Channel Strip
 HOME | TOOLKIT HOME | CLOSE | INDEX 
Physical Characteristics Tool-Series 1U high 19" Devices
Overall Depth:
< 350 mm without mating plugs
Power Supply Tool-Series Standard
Supply Coltages +/- 25 V and + 48 V Phantom
Current Consumption *) +/- 500 mA
Quiescient Current +/- 400 mA
Inputs 2 Main Inputs, Microphone, balanced, floating (Transformer)
and Line, electronically balanced
3 Insert-Inputs, Audio-Insert, Key-Insert Noise Gate
and Side-Chain Insert Compressor
electronically balanced
Microphone-Input balanced and floating, Transformer
nominal Level + 6 dBu - Gain
maximum Level at minimum gain, no pad
> 0 dBu at f >= 40 Hz
at minimum gain, with pad
> + 25 dBu at f >= 40 Hz
Input Impedance > 2 kOhms without pad, > 3 kOhm with pad
CMRR according to IRT > 90 dB below 1 kHz, > 70 dB at 15 kHz
all other Inputs electronically balanced, Line-Input +/- 20 dB gain control range
all other Inputs 0 dB
nominal Input Level + 6 dBu - Gain
maximum Input Level > + 30 dBu - Gain
Input Impedance 40 Hz - 15 kHz > 10 kOhms
nominal Source Impedance of driving Output 50 Ohms
CMRR Line + Insert 15 kHz > 65 dB, typical 75 dB 1 kHz > 80 dB, 40 Hz > 90 dB
see Diagram
Input CMRR vs Frequency
CMRR Key + SC-In 40 Hz - 15 kHz > 50 dB
Outputs 2 Main Outputs, OUT1 and OUT2 (separate level control)
3 Insert Outputs, Audio Insert, Key-Insert (Noise-Gate)
and Side-Chain Insert (Compressor)
electronically balanced, ground sensing
all output data are the same
nominal Level + 6 dBu
maximum Level > + 30 dBu
Source Impedance 50 Ohms, see Diagram
Output Source Impedance vs Frequency
Lastwiderstand see Diagram
maximum Output Level vs resistive Load
und
maximum Output Level vs capacitive Load
Symmetrie nach IEC > 40 dB, see Diagram
Output CMRR vs Frequency
Special Features The source impedance of the key-output and the side chain insert output can be changed to 600 ohms by internal jumpers. With this setting it is possible to parallel ouputs to link the compressor or noise gate controls of several devices.
Gain
Microphone Input control range 25 to 70 dB
pad switch 25 dB
Line-Input 0 dB at center (detent), calibrated +/- 0.2 dB, range +/- 20 dB
Output 2 calibrated or Off to + 6 dB
all other Inputs/Outputs fixed gain, at neutral position, 0 dB +/- 0.5 dB
Frequency Response
Microphone Amplifier
Microphone input to output, all processing stages off
30 Hz - 20 kHz +/- 0.2 dB, at all gain settings
Bandwidth
Microphone Amplifier
< 10 Hz bis > 100 kHz,
limited by internal RF filter
Frequency Response
Line-Level Path
Line input to any output
processing stage off,
10 Hz - 20 kHz +/- 0.2 dB
Bandwidth
Line-Level Path
< 10 Hz bis > 150 kHz,
200 kHz - 5 dB by internal RF filter
Phase Response Microphone input to output, processing stages off
20 Hz < +10°, 40 Hz < +5°,
10 kHz < -10°, 20 kHz <-20°

Line input to any output, processing stages off
20 Hz - 20 kHz <+5/10°

THD Line input to output, gain 0 dB
< + 30 dBu, 20 Hz ... 20 kHz, < 0.1 %,
< + 20 dBu, 20 Hz ... 20 kHz, < 0.03 %
Microphone input to output, 70 dB gain
< + 30 dBu, 20 Hz ... 20 kHz, < 0.1 %,
< + 20 dBu, 20 Hz ... 20 kHz, < 0.05 %
(the values are below noise, selective measurement necessary to determine k2 and k3)

Inserts, EQ and Filter do not alter the above values

THD of dynamics processors depends on the adjustments of the attack and release parameters, the frequency and the gain reduction.

Typical values for the compressor are:
Ratio - max, Envelope - off, Crest - 2, Gain - 0 dB, Knee - 0 dB
Attack - all to the left, Auto Gain - off
Release 0.3 s, Gain Reduction 10 dB,
THD at f > 40 Hz < 1 %

typical values of the Limiters:
Gain Reduction 3 dB, at f > 40 Hz, Klirrfaktor < 1 %
Signal to Noise Ratio
Microphone Amplifier
Source Resistance 200 Ohms
! Using a source resistance of 150 ohms according to US standards result in values that are 1.2 dB better !
Measuring bandwidth 22 Hz to 22 kHz
Noise figure in dB, quasi peak measurement with Filter CCIR-468, according to German IRT Rulebook 3/5
Reference: -118 dBqp for 200 ohms resistor noise
Gain 70 dB, Noise Figure F < 1.3 dB
Gain 40 dB, Noise Figure F < 2.0 dB

RMS value, linear between 22 Hz and 22 kHz,
absolute value below 0 dBu = 0.775V,
referred to input
Gain 70 dB, < 127.5 dBu
Gain 40 dB, < 126.0 dBu

A-weighted values, with filter according to DIN/IEC, AVG,
0 dBA at 1 kHz = 0.775 V, referred to input
Gain 70 dB, < 131.5 dBA
Gain 40 dB, < 131.0 dBA
Signal to Noise Ratio
Line Amplifier
Source Resistance 40 Ohms
Measuring bandwidth 22 Hz to 22 kHz
reference Level 0 dBu = 775 mV
Values in dBu: RMS, unweighted,
Values in dBA: A-weighted, AVG
Line Input to Output, 0 dB < -94 dBu / -98 dBA
Line Input to Output, + 20 dB < -86 dBu / -90 dBA
Signal to Noise Ratio
Processing Stages
Conditions similar to Line Amplifiers
Line Input to Output, Gain 0 dB
with High-pass/Low-pass Filters < -93 dBu / -97 dBA
with Insert, without external device < -93 dBu / -97 dBA
Compressor, Gain 0 dB, Autogain off < -91 dBu / - 95 dBA
Noise-Gate, no Signal, Range 0 dB < -91 dBu / -95 dBA
EQ, all controls at center positions < -90 dBu / -93 dBA
Dynamic Range
Microphone Amplififer
The dynamic range of the microphone amplifier depends on the gain setting that determines the noise voltage at the output. The dynamic range is the addition of the noise level and the maximum output level of + 30 dBu.

gain 40 dB
noise level (A-weighted) -131 dBA + 40 dB gain
+ 30 dB headroom = 101 dBA

Dynamic Range
Line Amplifier
Source Resistance 40 Ohms
Measuring bandwidth 22 Hz to 22 kHz
reference Level 0 dBu = 775 mV
Values in dBu: RMS, unweighted,
Values in dBA: A-weighted, AVG
Line Input to Output, 0 dB > -124 dBu / -128 dBA
Line Input to Output, + 20 dB > -116 dBu / -120 dBA
Dynamic Range
Processing-Stages
Conditions similar to Line Amplifiers
Line Input to Output, Gain 0 dB
with High-pass/Low-pass Filters > 123 dBu / 127 dBA
with Insert, without external device > 123 dBu / 127 dBA
Compressor, Gain 0 dB, Autogain of > 121 dBu / -125 dBA
Noise-Gate, no Signal, Range 0 dB > 121 dBu / 125 dBA
EQ, all controls at center positions > 120 dBu / 123 dBA
*) The standard supply current is the supply current under realitic operation conditions. If the outputs are loaded with the minium load resistors and the level is at + 30 dBu, the supply current increases by 30 mA per output. The standard supply current shuold be used to calculate the necessary power supply capacity of a system.