User Guide

AD2055
CLASS A EQUALIZER
Pure Class A music recording systems since 1985.
2002 b AVALON INDUSTRIES INC PO B 5976 S Cl t C lif i U S A
Pure Class A, 100% discrete design
Smooth musical detail and sonic excellence
DESIGNAVALON
PURE CLASS A MUSIC RECORDING SYSTEMS
AD2055 FEATURES
SONIC EXCELLENCE
The Avalon AD2055 Pure Class A music equalizer is the
most powerful, low noise parametric equalizer available
today. Designed to optimize absolute signal integrity and
musical performance, the AD2055 combines the best of
active and passive filter topologies with sonic excellence
unequaled by lesser designs. The AD2055 is the perfect
solution for two buss music-program equalization, special
instrument EQ and FX applications and ultra high
performance mastering studios.
Features include state-of-the-art, balanced 100% discrete,
Pure Class A signal amplifiers, practical user features and
rugged hardware designed to deliver true high
performance audio for many years.
PASSIVE-ACTIVE FILTER DESIGN
Avalon equalizers feature the unique combination of both
active and passive filter EQ designs. This special
combination enables the AD2055 to deliver high speed
transient detail at the operational extremes of real-world
equalization demands. The passive high and low bands
offer alternate musical tone range to the full function active
parametric mid bands. Passive equalizers have long been
a favorite with music lovers around the world..full bodied,
powerful (up to +/-32dB, 64dB range !) and sweet
frequency selections are the benefits of the passive high-
low EQ bands. The full bandwidth twin mid bands provide
variable frequency selection (X10 frequency multipliers for
very wide range), variable Q (width) and amplitude control.
MINIMUM SIGNAL PATH DESIGN
Avalon’s advanced true symmetry design offers high-
voltage, large headroom, extended bandwidth and very
low noise. The use of 100% discrete, Pure Class A signal
amplifiers give the serious music professional unlimited
sonic character and a natural harmonic detail that
enhances the program material and becomes one with
the music itself. The Avalon AD2055 breathes life!
AVALON
DESIGN
Minimum audio signal path
Dual mono operation
Transparent active and passive filter design
Very low noise -94dB
High headroom +30dB
Fully balanced inputs and outputs
DC coupled, no transformers in audio path
Switched frequencies in high and low bands
Mid bands use X10 frequency for extended range
Wide bandwidth -3dB 1Hz to 450kHz
Low distortion less than 0.5% THD and IMD
Conductive plastic potentiometers for low noise
All signal routing with sealed silver relays
100% discrete power supplies for audio path
External 150W toroidal power supply
Long lasting, stainless steel hardware