V700 Pro Audio Modules
general Specifications

This page contains information and explanations about the general technical data of the V700 series. All components of the V700 series comply with or (in most cases) surpass the stringent regulations as set out in the rulebook IRT 3/5. These are a set of very high performance values (or rules) originally mandated by the German national Television and Radio network. The European Commission directives later strengthened these rules. So, for e.g. with a +30dBu headroom, the V700 modules is 8dB higher than the IRT demand.

One rule of the IRT rulebook demands that high damping factor filters should be placed above and below the frequency range. This does not correspond with the desire for very linear phase response between the input and output of the modules (which is not mandated in the rules). Therefore, we supply modules in a version in accordance with the rulebook on special demand only. The standard version has a much lower phase rotation between the input and output. In this version, the damping is applied above and below the frequency range more moderately, so that the linear range of the frequency response exceeds 100 kHz.

The following is general data that apply to most of the modules. In the individual module descriptions you will find detailed data sheets for each unit. All data information represents minimum values. In some cases the real values are substantially higher than these minimum values that represent worst-case scenarios.


Balanced and floating inputs are standard on the V700 modules. However, some units, like the faders and pan-pot modules for use in custom build consoles have electronically balanced inputs and outputs. Microphone inputs are always balanced and floating.

Balanced and floating Line Inputs:

Nominal Level + 6 dBu
Maximum Level >+ 30 dBu - Gain
Input Impedance > 5 kOhm
Input CMRR > 60 dB according to IRT
typical value 74 dB bei 15 kHz
Haufe made tororial transformers

Balanced and floating Microphone Inputs:

Maximum Level >+ 30 dBu - Gain
Input Impedance >> 1 kOhm
Input CMRR > 70 dB according to IRT
Haufe made transformers

Electronically balanced Inputs:

Nominal Level + 6 dBu
Maximum Level >+ 30 dBu - Gain
Input Impedance > 10 kOhm
Input CMRR > 70 dB
(by manual adjustment)


Balanced and floating outputs are standard on the V700 modules. Transformers manufactured by Haufe or Lundahl are used. Some modules for use in customized consoles have electronically balanced inputs and outputs. This concerns, e. g., fader units and pan pots as well as zero ohm output for summing rails.

Balanced and floating Outputs:

Nominal Level + 6 dBu
Maximum Level >+ 30 dBu
(with kges 1 % and 40 Hz)
Load Resistance > 300 Ohm
Source Impedance < 40 Ohm
CMRR according to IEC > 40 dB
CMRR according to IRT > 60 dB
Transformers Haufe or Lundahl made

Electronically balanced Outputs:

Nominal Level + 6 dBu
Maximum Legel >+30 dBu - Attenuation Load Resistance > 600 Ohm
Source Resistance < 40 Ohm
CMRR according to IEC > 40 dB

All data is valid within the transmission band.


Within the transmission band crosstalk is typically:
Between independing Signals >95 dB
Between Multi-Channel Devices
(Stereo or 5·1) >70 dB
in MS-Direction Mixers > 40 dB


Nominal Level + 6 dBu

Any other nominal level can be choosen. Unless otherwise stated, data refers to: 0 dB = 1.55 V = + 6 dBu.


Nominal Tolerance ± 0.3 dB

This tolerance applies to calibrated scales points, like 0 dB points of faders, center detends of rotary gain controls and as well as other level adjusting controls like stepper switches.


Headroom >+ 30 dBu

The headroom for all devices is >+30 dBu at inputs and outputs - depnding ont the setting of gain or attenuation. The value of + 30 dBu applies to a harmonic distortion of kges >1% in the transmission band and is typically 0.3 % at + 30 dBu and 40 Hz. The observance of the value assumes the correct setting of the power supply voltages. *1

Dynamic Range, Signal to Noise Ratios and Noise Level

The noise level of the processing devices is specified in the module specific data sheets. The majority of the V700 modules have an dynamic range of more than 120 dB RMS (22Hz to 22 kHz), at a nominal level of + 6 dBu with 24 dB headroom and 96 dB signal to noise ratio. The IRT demands with regard to the operating characteristic are excelled in all gain ranges.

Master Outputs
The signal to noise ratios for masters and groups depend on the number of channels beeing used. In the V700 system a balanced zero ohm summing system with very low impedance mixing resistors is applied that offers excellent noise performance.

Microphone Preamplifier
With more than 70 dB of gain the noise figure is > 1 dB (200 Ohm source, less than -117 dBqp input referred).

With 45 dB of gain the noise figure is < 2 dB (200 Ohm source, less than -116 dBqp input referred).

Harmonic Distortion:

kges < 0.1 %

Within input and output levels up to +26 dBu within the transmission band the maximum harmonic distortion with the nominal load resistance ammounts to 0.1 %.

For devices equipped with transformers the distortion coefficient k3 rises at 40 Hz up to a level of + 30 dBu at maximally 1 % . The typical value for the THD at 40 Hz and + 30 dBu is 0.3 %. The Haufe und Lundahl tranformers have saturation levels of >> + 30 dBu at 40 Hz.

With regulation amplifiers the harmonic distortion is determined by the setting of the release and attack parameters.

Frequency Response
For any modules at nominal level, without any processing stages that affect or modify the frequency response:

20 Hz bis 20 kHz ± 0.25

The normally integrated RF- and subsonic filters attenuate frequencies above 100 kHz and below 10 Hz. In the standard version the attenuation at 200 kHz is - 4 dB and the attenuation at 5 Hz is - 2 dB. Above 100 kHz and below 10 Hz the signal level rises by resonance effects not above 0 dB values. Modules that are produced according to the IRT rules are kept within the specified frequency range of 15 Hz to 40 kHz. The filters can be tuned differently for custom versions.

For microphone amplifiers a more effective filtering is employed because of the high sensitivity of the microphones and cables to subsonic disturbances and RF irradation. The following data is valid for all gains from 0 to 80 dB.

40 Hz to 15 kHz ± 0.5 dB
20 Hz to 20 kHz + 0.5 / - 1.5 dB
Attenuation at 5 Hz > 6 dB
Attenuation at 200 kHz > 10 dB

Modules produced according to the IRT directives have a blocking attenuation of > 20 dB at 40 kHz and > 12 dB at 15 Hz.

Inquiry / Order
Test Review
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An overview on the stereo mastering modules.... more
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Stem Mixing
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Eine Übersicht der Vorverstärker mit Links auf die Modulseiten.... weiter
V700 'Cassette Modules' the Roots
Certainly, the traditional, German 'Cassette' technique for professional audio consoles... more
V700 Frames
... is the standard mounting frame of the V700 pro audio module systems. It is a 5U high.... more
Module Construction
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Power Supply
V700 and Integrator audio modules use the same power supply.. more

Phase Response

Equal matched audio chains have

less than 5° phase difference

in the transmission band. The phase response is determined, first of all, by the layout of the RF and subsonic filters. 2)

Cut Off Levels

closed faders > 100 dB
Cut Switches > 110 dB
Group Switches > 100 dB
Rotary Potentiometers > 80 dB
Pan-Pot and Balance Controls > 70 dB

Transmission Band

In accordance with the IRT 3/5 rules the frequency range of 40 Hz to 15 kHz is defined. These values do not refer to the frequency range of the devices but to the standardized values for the measurement of vertain data. So CMRR values are measured at inputs and outputs usually at 15 kHz. The measurement of distortion is at 40 Hz.


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