Dual-Band De-Esser Module

Our well known De-Esser as a dual-band version built into a single module for the 500 Series.


With On/Bypass you switch the module on or off (bypass).

Signal LED

The Sig LED (Sig) indicates whether an audio signal is present at the input and exceeds a level of -20 dB. This LED indicator serves as an aid to quickly recognize whether a signal is arriving at the DeS in a complex studio cabling system.


The Hi-S control adjusts the intensity of the S sound reduction in the upper frequency band. The center frequency for sibilance detection is 11.2 kHz with a bandwidth of 3 kHz.


The Lo-S control adjusts the intensity of the S sound reduction in the lower frequency band.

Male/Female Voicing

The Voice switch is used to adjust the low-band de-esser to the voice characteristics. The switch changes the center frequency for the sibilance identification: Female: 7.6 kHz, Male: 6.4 kHz. The processing bandwidth in the low band is 1.44 kHz.

De-Esser Tech Talk

De-Essing by Phase Cancellation

SPL has developed a circuit technology that combines efficient de-essing with maximum ease of use. De-essing already during recording spares a lot of time in comparison to the subsequent search for the S-sounds in post production.

The DeS automatically adjusts itself to the relevant frequencies and hones in on them so that only the range of the S-sound is processed and neighbouring frequencies remain untouched.

This range is phase-inverted and mixed back into the original signal, which acoustically deletes the S-sound. The DeS therefore works unobstrusively and sound-neutral.


The DeS features our Auto-Threshold which automatically adjusts the threshold if the input level fluctuates due to varying distance to the microphone which leads to fluctuating input levels. With Auto-Threshold engaged, the de-essing intensity remains constant at the value you set – a great help not only for untrained speakers/singers in the studio and live.

With conventional de-essers using compressor technology, the processing intensity decreases as the distance to the microphone increases to which compressors or limiters then react by letting the S sounds reappear. The disadvantage of weaker de-essing – bad enough in itself – therefore also leads to undesired effects in the subsequent processing. Auto-Threshold prevents these disadvantages from occurring in the first place.


Recording Magazin

Other Processing Products

Mastering M/S Processor
Mastering Compressor
Mastering Equalizer
Passive Mastering Equalizer
Power Soak
Transient Designer 500
Stereo Vitalizer Mk2-T
Stereo Vitalizer Mk2-T
Program Equalizer
Tube Vitalizer
Tube Vitalizer
Program Equalizer
Auto Dynamic De-Esser
Transient Designer 4
Transient Designer 4
Dynamics Processor



Input & Output; balanced

Maximum input & output gain
21 dBu
Input impedance
Output impedance
150 Ω
Common mode rejection
-82 dB
Frequency range (-3 dB)
10 Hz – 100 kHz
THD & N (0 dBu, 10 Hz – 22 kHz)
0,03 %
Noise (A-weighted)
-92.3 dB
Dynamic range
113 dB

Dimensions & Weight

Single-spaced module for 500 Series
Unit weight
0.65 kg
1.43 lbs
Shipping weight (incl. packaging)
0.7 kg
1.54 lbs

Reference: 0 dBu = 0,775V. All specifications are subject to change without notice.


Due to Covid19 there are no events scheduled at this time.

What does it actually mean …

In Stock!

The product is in stock in our warehouse in Niederkrüchten, Germany, and will be shipped the same or next working day.

We process the orders after receipt of the order and update the stock in the online shop regularly. If the product is no longer available at short notice due to high order volume, you naturally have the right to withdraw from the purchase (see Right of Withdrawal).

In any case, you will receive an e-mail with details of the delivery and the estimated delivery time.

Available soon!

The product is not in stock in our warehouse in Niederkrüchten, Germany. Usually it will be available again within 5 working days.

Due to the current pandemic and the associated worldwide shortage of components, delivery times may be significantly delayed in some cases.

In any case, you will receive an e-mail with the details of the delivery and the estimated delivery time.

Of course you have the right to withdraw from your purchase (see Right of Withdrawal).

Product Condition


Brand-new product from the current product portfolio.


Demo, exhibit or return item.
In original packaging, incl. manuals and full warranty.
Only slight to no signs of use.


Demo, exhibit or return item.
In original packaging, incl. manuals and legal warranty.
In some cases clear signs of use, which are documented in photos.


"New Old Stock"
After discontinuation of a product still available new products with full warranty.