AVALON DESIGN PURE CLASS A AD2055 DUAL MONO, MUSIC EQUALIZER

AVA L O N

P URE C LASS A

DESIGN

M USIC R ECORDING S YSTEMS
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 highlow 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 Avalons advanced true symmetry design offers highvoltage, 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!

AD2055

CLASS A EQUALIZER

AD2055 FEATURES

Smooth musical detail and sonic excellence Minimum audio signal path Pure Class A, 100% discrete design 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

AVALON

Pure Class A music recording systems since 1985.
c 2002 by AVALON INDUSTRIES, INC. PO Box 5976, San Clemente, California, U.S.A. Tel: 949-492-2000 Fax: 949-492-4284 www.avalondesign.com email.avalon@avalondesign.com

A D 5 5

Circuit topology Output gain range Maximum input level Maximum output level Input-Output type Noise 20kHz unweighted Distortion THD, IMD Frequency response -3dB Equalizer type Bypass Low band F1 F1 frequency range Mid band F2 F2 frequency range Mid band F3 F3 frequency range High band F4 F4 frequency range
S P E C I F I C A T I O N S
High-voltage 100% discrete, balanced and symmetrical Class A Unity gain +30dB balanced XLR pin 2 hot +32dB balanced 600 ohms, DC coupled, high-current discrete Class A XLR type, pin 2 hot balanced -94dB (EQ in) 0.5% (typical 0.05% at +6dB 1kHz) 1Hz to 450kHz (input band limited) Passive high and low bands plus two fully parametric mid bands Hard-wire relay bypass for equalizer in-out Passive, amplitude to -32dB to +32dB shelf or peak-dip curve Switched 10 position 18Hz, 25, 30, 50, 72, 100, 150, 215, 300, 450Hz Active, amplitude to -16dB to +16dB peak-dip curve Variable 35Hz to 450Hz (x10) 350Hz to 4k5Hz, Q (width) 0.3 to 3.0 Active, amplitude to -16dB to +16dB peak-dip curve Variable 160Hz to 2k0Hz (x10) 1k6Hz to 20kHz, Q (width) 0.3 to 3.0 Passive, amplitude to -26dB to +26dB shelf or peak-dip curve Switched 10 position 1k5Hz, 2k5, 3k5, 5k, 7k2, 10k, 12k5, 15k, 20k, 25kHz
AC-DC power (B2T power supply included) Dimensions Shipping weight
External AC supply, 150w toroidal transformer, 4 pin cable 90v isolated, 100-240v selectable 50/60Hz, 150w max 19 x 3.5 x 12 in (482 x 88 x 305mm) 30lbs (13.6 kg)
Avalon reserves the right to incorporate changes in design and in the specifications of this product without prior notice.