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6] specifications – Buzz Audio essence optical compressor User Manual

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Tips for Using the Essence continued…

both HI and LO EQ) or reduce it (boost both HI and LO
EQ

). Once again, experimentation is the key and there

is no right or wrong way to use this function. And
remember that you can monitor what you doing with
these switches by engaging the S/C MON.

•Side Chain Insert
This function has numerous uses including inserting a
more elaborate equalizer into the Essence side chain or
for “keying” the compressor. By inserting a 1/3 octave
graphic equalizer, very narrow band compression to
clamp a troublesome resonance on a bass track is
possible. Or, by using fast attack and release times and
boosting around 6-20Khz on the graphic, vocal de-
essing is possible.

Keying involves using a particular sound to reduce the
volume of another sound. As an example, a guitar
track could be made to reduce in volume with the
vocal track by passing the guitar through the Essence
main audio path and feeding the vocal track into the
side chain insert return. With appropriate adjustments,
the guitar track will get quieter when the vocal is
present. All sorts of similar effects are possible.


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6] Specifications

Frequency Response

with no gain reduction

14Hz to 107kHz, +/- 1.5dB

Maximum Input Level

+25dBu

Maximum Output Level

+27dBu


Total Harmonic Distortion
Measured at 0dBu input, no gain reduction, make up Gain 0dB
100Hz

0.1%, 1kHz 0.015%, 10kHz 0.002%

Measured at +10dBu input, 20dB gain reduction, make up Gain
+15dB, Attack AUTO, Release 16
100Hz

0.1%, 1kHz 0.015%, 10kHz 0.005%


Residual Noise

-95dB A wtg, 150ohm source Z, make up Gain 0dB

Make up Gain

0dB to +15dB

Maximum Available Gain Reduction

25dB

S/C HI EQ Boost/Cut

8dB @ 10kHz

S/C LO EQ Boost/Cut

8dB @ 100Hz


Main Audio Input Impedance

20k ohms, bal or unbal

Main Output Impedance

100 ohms bal or unbal


Sidechain Send Output Impedance

100 ohms unbal

Sidechain Return Input Impedance

44k ohms bal or unbal

Sidechain Max Input/Output Levels

+22dBu


Size

= (3”Wx5.25”H). Fits 2 spaces in API™ 500VPR Series rack format

Power requirements

= 120mA +/- 15-18 volts DC, as supplied by

rack power supply.

Specifications are typical of a production unit and are subject to
change without notice because we might be able to make it slightly
better. 0dBu reference = 0.775 volts RMS.