Electrical Characteristics ToolKit Input Channel Strip 



Physical Characteristics  ToolSeries 1U high 19" Devices Overall Depth: < 350 mm without mating plugs 

Power Supply  ToolSeries 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 InsertInputs, AudioInsert, KeyInsert Noise Gate and SideChain Insert Compressor electronically balanced 

MicrophoneInput  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, LineInput +/ 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 + SCIn  40 Hz  15 kHz > 50 dB  
Outputs  2 Main Outputs, OUT1 and OUT2 (separate level control) 3 Insert Outputs, Audio Insert, KeyInsert (NoiseGate) and SideChain 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 

Load Impedance  see Diagram maximum Output Level vs resistive Load and maximum Output Level vs capacitive Load 

CMRR according to IEC  > 40 dB, see Diagram Output CMRR vs Frequency 

Special Features  The source impedance of the keyoutput 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 

LineInput  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 LineLevel Path 
Line input to any output processing stage off, 10 Hz  20 kHz +/ 0.2 dB 

Bandwidth LineLevel 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 

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 CCIR468, 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 Aweighted 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: Aweighted, 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 Highpass/Lowpass Filters < 93 dBu / 97 dBA with Insert, without external device < 93 dBu / 97 dBA Compressor, Gain 0 dB, Autogain off < 91 dBu /  95 dBA NoiseGate, 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 

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: Aweighted, AVG Line Input to Output, 0 dB > 124 dBu / 128 dBA Line Input to Output, + 20 dB > 116 dBu / 120 dBA 

Dynamic Range ProcessingStages 
Conditions similar to Line Amplifiers Line Input to Output, Gain 0 dB with Highpass/Lowpass Filters > 123 dBu / 127 dBA with Insert, without external device > 123 dBu / 127 dBA Compressor, Gain 0 dB, Autogain of > 121 dBu / 125 dBA NoiseGate, 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.  