Introduction

The Auto-Dynamic De-Esser is a highly specialized audio tool. It is used to reduce S-frequency of speakers and singers. It should perform without disturbing natural character and timbre of the voice. This is not an easy task. SPL has developed a new circuit design that combines ease of use with natural sounding and effective performance.

How do traditional De-Essers work?

Traditional De-Essers use compressor-technology. The control elements are a threshold control and a frequency control. The threshold sets the level at which de-essing starts and the frequency control sets the center frequency of a frequency band that is usually up to 3-4 kHz wide. Any S-frequency within that band causes the compressor to compress the entire frequency band. As a result the voice speaks through the noise or lisps.

How does SPL’s Auto Dynamic De-Esser work?

The Auto Dynamic De-Esser utilizes a new circuit design that “scans” the frequency spectrum and automatically hones in on S-frequencies. Only these narrow-band frequencies are processed and adjacent frequencies are left untouched. The Auto Dynamic De-Esser reduces S-frequencies by feeding a phase inversed signal of the detected narrow band S-frequency back into the signal path. The S-frequency is cancelled out. Therefore the quality of De-Essing is significantly improved – the result is neutrality to the sound and an unobtrusive but very effective mode of operation. There are almost no negative side effects on the timbre and character of the voice, even while using a high intensity of S-Reduction.

Installation & Security Advices

The housing of the Auto Dynamic DeEsser has the standard 19"-EIA format and occupies 1U (44.45 mm) in your rack. When installing the unit in a 19"- rack, the rear side of the unit needs some support, especially in a touring case.

The Auto Dynamic DeEsser should not be installed directly above or below power amplifiers or near units which produce strong magnetic fields or extreme heat.

Check that the voltage details quoted on the back panel are the same as your local mains electricity supply. Use a minus (-) screwdriver to set the voltage selector to the appropriate value.

Never cover up the ventilation slots on the top of the unit. If, during opera- tion, the sound is interrupted or indicators no longer illuminate, or if abnormal odor or smoke is detected, or if liquids are spilled on the unit, immediately disconnect the power cord plug and contact your dealer.

Only clean the Auto Dynamic DeEsser with a soft, lint-free cloth.