FEA Labs Dual Engine Compressor Limiter User Manual
FEA
DUAL ENGINE
COMPRESSOR LIMITER
www.fealabs.com
Battery replacement:
Remove the four screws on the bottom cover to access the battery
compartment. If storing the unit for long periods of time the battery
should be removed to prevent corrosion of the battery snap. Be sure
to place the battery wires along the side of the battery in the battery
pocket and use care while replacing the bottom cover.
Warranty:
The FEA Dual Engine Compressor Limiter is fully covered for a period
of 5 (five) years and the footswitches are covered for 1 (one) year
against defects in material and workmanship. Abuse and neglect are
not covered under the warranty. Any modifications or repairs not
authorized by FEA voids all warranties. The customer will be
responsible for shipping cost to and from FEA Labs for repairs.
Contact FEA before attempting to ship a unit for repair at:
info@fealabs.com.
All repairs made outside of the warranty period will be very
reasonable (usually only the cost of the parts)… your satisfaction is
priority one.
Contact FEA Labs at:
www.fealabs.com
info@fealabs.com
REV 1.2
Technical Specifications:
ATTACK: COMP: 2mS to 150mS
LIMITER: 100µS to 50mS
ADAPTIVE RELEASE: COMP: 50mS to 600mS
LIMITER: 45mS to 380mS
RATIO: COMP: 1.5:1 to 20:1
LIMITER: :1
THRESHOLD: COMP: -39dBu to
LIMITER: -35dBu to
Make-up GAIN: 0 to 23dB
Maximum Input: 13dBu
Maximum Output: 15dBu
Frequency Response: 20Hz – 20KHz +1/-3dB
Input Impedance: 1M ohm
Output Impedance: 10K ohm
Current Consumption: Approx. 34mA
Battery Life: Approx. 15 hours continuous use
Power adapter : 9VDC 2.1mm negative center pin
(Not Included)
About the design:
The FEA DUAL ENGINE COMPRESSOR LIMITER is designed with
both audiophile and studio quality features that many musicians will
enjoy.
The FEA DE-CL utilizes two sidechain control engines for audio signal
dynamics control. The compressor sidechain is based off of the FEA
Opti-FET compressor sidechain for its smooth compression qualities.
The DE-CL limiters sidechain is optimized specifically for high
performance limiter operation. The limiter has an adjustable attack so
that it can also be used as a very high ratio compressor if desired.
Both the limiter and compressor control a single optical gain cell in the
audio path for parallel processing of the audio signal dynamics. This
compressor and limiter configuration allows for multi-slope
compression that is found in some high-end rack units.
This is the first FEA compressor/limiter that utilizes adaptive release
circuitry. Adaptive release is sometimes referred to as “program
dependent release” by other compressor manufacturers. Adaptive
release is designed to behave more like the dynamic response of our
human hearing. If the instrument signal triggers the threshold in short
bursts then the release will be fairly quick. If the threshold is
continually activated over a period of several seconds, then the
release will be slower. This adaptive release sounds very natural and
balanced.
The DE-CL utilizes an audiophile grade Burr-Brown SoundPlus™
operational amplifier for the output amplifier. The Burr-Brown™
amplifier was specifically chosen for its outstanding performance. The
output amplifier circuit also contains a warmth control. The warmth
circuit is designed to integrate amplifier characteristics and harmonics
that have a warming tonal change. With the warmth control set to
minimum, the output amplifier operates in a clear, linear fashion for
very low distortion. As the warmth control is increased, the output
amplifier is made to operate in an increasing asymmetrical mode
along with transient nonlinearities. The range of the warmth circuit is
very large and can create tonal warming harmonics far beyond typical
warm sounding amplifiers. The input stage is a high impedance, hi-fi
amplifier buffer. The input amplifier has been designed to have
minimal signal distortion, minimal noise and maximum headroom for
all input signal levels.
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