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2.5 The COUPLE function
The couple switch links channel 1 and channel 2. This includes each channel’s expander detection and filter
detection circuits. Although this allows the two channels to track each other for stereo applications, it should
be pointed out that this is not a master/slave setup, but rather a link and for true stereo tracking it is
necessary to set both channel’s controls identically.
In master/slave operation one channel exclusively governs both channels, whereby in couple mode both
channels are combined resulting in a common control voltage.
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When using the COUPLE switch, a high-level, high-frequency signal present in one channel
will cause the expander and filter of both channels to open at the same point. Accordingly,
both channel’s expanders and filters are supposed to close at the same point. Therefore, it is
recommended that both channels are set identically. (The most critical controls are the
expander THRESHOLD and the filter SENSITIVITY controls.) If the two channels are not set
identically, a predominant setting in one channel will affect the other channel.
The only two controls that operate separately when the COUPLE switch is on are the expander RELEASE
and the expander RATIO controls. It is recommended to set these controls identically on both channels.
However, if one channel reveals more noise than the other, the expander RELEASE/RATIO controls of the
respective channel can be used to let the expander close quicker for effective noise reduction while still
tracking in stereo.
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If using the COUPLE switch, it is recommended that all controls are set identically to ensure
proper tracking.
3. APPLICATIONS
In this section several typical applications of the DENOISER are discussed. The following basic settings can
solve most dynamic problems. They are the ideal starting point.
Please take the time to study the application examples carefully, in order to be able to make full use of the
DENOISER's capabilities in future.
The main applications of the DENOISER can be divided into three categories:
1. The DENOISER is used to eliminate interferences from acoustic instruments such as guitars etc. as
well as keyboards, samplers or other line level instrument signals.
2. The DENOISER is used to eliminate interferences in effects devices, tape machines, mixers or other
studio equipment.
3. The DENOISER can be used for removing noise from records and any tape recordings.
3.1 Initial settings of the DENOISER
The subsequent settings of the front panel controls will be based on the respective input level and noise floor.
Due to the fact that it would be impossible to demonstrate every application you can think of, we recommend
to carefully read this manual and the function of its controls, as the unit has a certain complexity due to the
extensive setting variations. Once familiar with the functions of the individual controls, you will be able to
purposefully and creatively operate the unit.
The following chart shows a typical setup and can be used as a guide for a variety of applications:
DENOISER SNR2000
Example:
Type of music
composite (e.g. mixdown)
Reference level
Noise floor
Tab. 3.1: Example for a standard application
3. APPLICATIONS
-10 dBu
-60 dBu
15
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