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Compression Amplifier, Mono


Our Price: $475.00
List Price: $499.00
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The PBC-6A differs from many other audio compressors in a couple of ways:

  • No Threshold
    There's no threshold in the PBC-6A. Unlike compressors with threshold controls, the signal passing through the PBC-6A is always being compressed rather than compressing only those parts of the signal that are above a set threashold. This makes the PBC-6A a non-linear, compression amplifier (CA).
  • Level-Dependent Ratio
    The PBC uses a feedback configuration to help achieve its function. Along with this, the PBC's detector allows higher output signals to compress more than lower-level ones. With the lack of thresholding, the change in ratio is smooth and gradual from low-level signals to higher-level.
  • Knee Control
    This allows a transition from lower-to-higher ratios to occur over a smaller range than would "naturally" happen due to the PBC's feedback and detector configuration.

These main features help the PBC-6A achieve a wide-range of compression effects - from delicate to crushed.


  • Drive
    The PBC's feedback configuration makes it possible to vary both the amount of compression along with some intrinsic make-up gain in one control. This is it. The most compression is attained with the DRIVE control fully clockwise and at a minimum in the fully counterclockwise direction.
  • Knee
    The more clockwise this control, the smaller the change in the input signal that is required to achieve higher compression ratios. Conversely, the more counterclockwise this control, the wider the change in the input signal that is required to achieve higher compression ratios.
  • Attack
    As with many other compressors, this controls how quickly the PBC will react to changes in the input signal. Subjectively, this control allows high frequencies to be more easily emphasized.
  • Release
    This control determines how quickly the PBC will return to its previous gain levels as the signal level decreases.
  • Output
    This provides a convenient means to help match levels between the PBC and subsequent devices.
  • Bypass
    This push button alternatively allows the selection of the signal present at the input jack or the output of the PBC's balanced line driver.
  • Thick
    This alters the PBC's release characteristics in a way that is perceived as "thickening" the sound. This is subtle, but notable in its absence.

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