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SPL De-Esser:

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The SPL De-Esser is and auto dynamic, simple to use, recording studio and audio mixing tool for removing undesired sibilant frequencies without compromising the timbre and natural character of the voice.

To solve this difficult problem, SPL has developed a new circuit design that combines ease of use with natural sound characteristics and the highest level of technical performance.

Conventional De-Essing

Traditional de-essers use compression techniques. In addition to the threshold parameter used to set the processing level, there is a frequency controller for setting the center frequency of the process (with bandwidths generally up to 4 kHz). Processing therefore compresses the entire selected range, not just the sibilant or S sounds. This results in the familiar and undesired side-effects such as lisping and a nasal-sounding vocal.

SPL's De-Essing

SPL's Auto Dynamic De-Esser monitors the entire frequency spectrum and automatically detects the sibilant frequencies. The bandwidth is set so narrowly around the range of the sibilance that neighboring frequencies remain unaffected. This frequency band is mixed back into the main signal phase-inverted to cancel out the sibilance. The result is a sound-neutral, inconspicuous and extremely effective process. Even at high s-reduction values the de-essing has an negligible effect on the character and timbre of the voice.

Auto-Threshold

Rounding out this outstanding concept is an automatic threshold-adjusting function: Differences in the input level caused by the singer moving in relation to the microphone are automatically compensated, so that the selected reduction value remains constant. In traditional de-essers, the processing intensity drops off with increasing distance, and compressors placed after the de-esser for signal correction tend to respond incorrectly to the changed values.

Male/Female

The SPL system doesn't just look for sibilance in a wide 'general sibilance' region of the spectrum. Instead, the user simply sets a front-panel switch to Male or Female to adjust for the vocal characteristics of male or female voices.

Features

Symmetrical XLR and jack plugs for the i/o, internal power supply with toroidal transformer, GND lift switch, relay hard bypass/power fail safety, voltage selector switch.

Specifications

  • Inputs and outputs:
    • Instrumentation Amplifier:
      Electronically balanced
      (differential), transformerless
    • Nominal Input Level:
      +6 dB
    • Input Impedance:
      22 kOhm
    • Output Impedance:
      < 600 Ohm
    • Max. Input Level:
      +24 dBu
    • Max. Output Level:
      +22.4 dBu
    • Minimum Load:
      600 Ohm
    • Relay hard bypass / power fail safety
  • Measured data
    • Frequency response:
      20 Hz-50 kHz
      (50kHz= -3dB)
    • Common mode rejection:
      > -80 dBu @1kHz
    • Total harmonic distortion:
      0.002% @ 1 kHz
    • Signal-to-noise ratio:
      -93 dBu (CCIR 468-3)
      -98 dBu (A-weighted)
  • Power supply
    • Toroidal transformer:
      15 VA
    • Fuses:
      (230/115 V) 315 mA/630 mA
    • GND lift switch, voltage selection switch 115 V / 230V
  • Dimensions
    • Standard EIA 19"/IHE 482 x 44 x 237mm
    • Weight 3.4 kg

Note: 0 dBu = 0.775 V

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