SPL De-Esser

SPL De-Esser

The Auto-Dynamic De-Esser is a specialized audio tool for removing undesired sibilant frequencies in a very simple and musical way.

Auto-Dynamic De-Esser The Auto-Dynamic De-Esser is a specialized audio tool for removing undesired sibilant frequencies in a very simple and musical way. The S-removal is based on phase cancellation which does not compromise the timbre and natural character of the recorded vocal track. The Auto-Dynamic De-Esser uses a unique technology to reduce sibiliance in a mix or on vocal tracks. The result is a neutral, unobtrusive and extremely effective de-essing process. Even at high S-reduction values the de-essing has a negligible effect on the character and timbre of the voice.

Unique Technology

SPL has developed a new circuit design that combines ease of use with natural sound characteristics and the highest level of technical performance. The 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 egligible effect on the character and timbre of the voice.

How It Works

The Auto Dynamic De-Esser monitors the S-frequency spectrum and automatically detects the sibilant frequencies. The de-ess bandwidth is set so narrowly around the range of the sibilance that neighbouring frequencies remain unaffected. The detected sibiliance is mixed back into the main signal phase-inverted so that only the S-sounds are cancelled. The S-reduction control sets the intensity of the S-reduction.

Ease Of Use

The Auto Dynamic De-Esser is extremely simple to operate: The S-Reduction control is the only control you need to set. The more it is turned up the more sibiliance is removed. You can set the detection to better find sibiliance in male or female vocals by selecting the respective Male/Female button.

Auto Threshold

Rounding out the amazingly simple control system is an automatic threshold-adjusting function. Level differences in the input level caused by the varying distance to the mic, are compensated for automatically. This ensures even de-essing independent of the input signal level so any necessary compression may be applied post the de-esser.

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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

Measurements

• 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)
• Signal-to-noise ratio -98 dBu (A-weighted)

Power supply

• Toroidal transformer 15 VA
• Fuses 315 mA (230V) /630 mA (115V)
• GND lift switch
• Voltage selection switch 115 V / 230V

Dimensions & Weight

• WxHxD: 482 x 44 x 237mm; 19" x 1.73" x 9.33"
• Weight: 3.4kg; 7.5lbs