DerrEsser is a multi function dynamic filtering device, in an API 500 series
module format. In its basic “DS” mode, the DerrEsser is an effective, level
insensitive de-esser, which is a device that will adjust the high frequency
gain on overly trebly or spiky vocal, or other source. By using a crossover
technique, and dividing the audio up into a high frequency range and a low
frequency range, the DerrEsser can use its Voltage Controlled Amp to turn down
comparatively high or harsh high frequencies in an extremely musical manner.
However, unlike other de-essers, the device is not limited to just de-essing,
and allows for multi use of its circuitry.
Bypass, there are essentially four modes of the DerrEsser:
DS Mode –
(Bypass Button IN, all other buttons OUT). As a de-esser in the DS mode (HF
Limit OFF), one can set the threshold to tame harsh S’s (sibilants) that result
from an overly bright singer or from EQ’ing to make a vocal sound aggressive
and clear. In this mode, the dyamic action is “level insensitive”, as the
detector circuitry compares the High Frequency content to the low frequency
content, Overall signal level doesn’t matter at all. When there is enough HF
compared to LF, the threshold is exceeded and the DerrEsser starts to turn down
the frequencies above the crossover point set by the Frequency control on the
front panel. Again, great care was taken to ensure this DS section meets the
Empirical Labs reputation for originality and ease of use. We use the latest
technology VCA, specially selected for glitch free, distortion free, and noise
free performance. The time constants were carefully selected and the corner
frequency is user adjustable with a high performance active crossover.
HF LIMIT –
(Bypass Button IN, HF LIM IN, all other buttons OUT). In this mode, the
DerrEsser looks at the general level of the High Frequencies only. Think of it
as a high frequency compressor. If there is enough high frequency content to
exceed the threshold, then gain reduction occurs. It IS level sensitive, but
responds much more to high frequencies. This mode can also act as a de-esser
but is more of a general high frequency smoothing device.The HF limiter is
probably the first carefully tailored soft knee HF limiter in existence. We
believe both the DS and HF LIM modes offer the highest performance of any
(Bypass Button IN, Listen IN, HP/LP OUT, HF LIM doesn’t matter). By using the
“LISTEN” Function, the user can employ the superb filter circuitry inside the
DerrEsser to process their audio. With the LISTEN button IN, and the HP/LP
switch OUT, the user will be hearing the high frequencies that are being
controlled with the dynamic/compression circuits. The corner frequency is
adjustable by the Frequency knob. Once the LISTEN switch is engaged, all
bargraph LED’s should light as indication.
(Bypass Button IN, Listen IN, HP/LP IN, HF LIM doesn’t matter). With the LISTEN
button IN, and the HP/LP button IN, the user is now listening to the low
frequencies, those not affected by the VCA and dynamic/compression circuits.
This is a 12 dB per octave filter whose corner frequency can again, be adjusted
by the Frequency knob.