Avalon Design AD2077 Datasheet

AD2077

MASTERING EQUALIZER

Pure Class A music recording systems since 1985.

2002 by AVALON INDUSTRIES, INC. PO Box 5976, San Clemente, California, U.S.A.

Tel: [phone] Fax: [phone]

www.avalondesign.com

[e-mail]

c

Pure Class A, 100% discrete design

Smooth musical detail and sonic excellence

DESIGNAVALON

P

URE

C

LASS

A M

USIC

R

ECORDING

S

YSTEMS

AD2077 FEATURES

SONIC EXCELLENCE

The Avalon AD2077 Pure Class A mastering equalizer is
the most advanced, low noise, fully switched parametric
equalizer available today. Designed for absolute signal
integrity and musical performance, the AD2077 combines
the best active and passive filter topologies for sonic
excellence unequaled by lesser designs.
The AD2077 is the perfect solution for two buss music­program equalization and ultra-high performance analog
mastering applications. 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 EQ filters. This special combination
enables the AD2077 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 +/-20dB, 40dB range !) and sweet frequency
selections are the benefits of the passive high-low EQ
bands. The full bandwidth twin mid bands provide switched
frequency selection (X10 frequency multipliers for very
wide range), switched Q (width) and amplitude control.

MINIMUM SIGNAL PATH DESIGN

Avalon's 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 mastering engineer unlimited
sonic character and a natural harmonic detail that
enhances the program material and becomes one with
the music itself.

AVAL ON

DESIGN

Minimum audio signal path

Dual mono, fully switched controls
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
104 switched frequencies per channel
Mid bands use X10 frequency for extended range
Wide bandwidth -3dB 1Hz to 450kHz
Low distortion less than 0.5% THD and IMD
Switched range control 0.5dB, 1dB and 2dB steps
All signal routing with sealed silver relays
100% discrete power supplies for audio path
External 150W toroidal power supply

AVALON DESIGN PURE CLASS A AD2077 DUAL MONO, MASTERING EQUALIZER

2002 by AVALON INDUSTRIES, INC. PO Box 5976, San Clemente, California, U.S.A.

Tel: [phone] Fax: [phone]

www.avalondesign.com

[e-mail]

c

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

AC-DC power
(B2T power supply included)

Dimensions
Shipping weight

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 L-R in-out plus silent opto switch
for seamless stereo bypass.

Passive, switched amplitude to -20dB to +20dB in 0.5dB, 1dB or 2dB steps,
shelf or peak-dip curve, switched 18, 25, 30, 50, 72, 100, 150, 200, 300, 400Hz

Active, switched amplitude to -10dB to +10dB in 0.5dB or 1dB steps,
Switched 12, 15, 18, 21, 25, 30, 36, 42, 50, 60, 70, 84, 100, 120, 140, 170,
200, 240, 280, 340, 400Hz, (x10) 120, 150, 180, 210, 250, 300, 360, 420,
500, 600, 700, 840, 1k, 1k2, 1k4, 1k7, 2k, 2k4, 2k8, 3k4, 4kHz
Q (width) switched 5 positions 6, 9, 12, 15, 18dB per octave

Active, switched amplitude to -10dB to +10dB in 0.5dB or 1dB steps,
Switched 140, 160, 180, 210, 250, 300, 350, 420, 500, 600, 700, 840, 1k, 1k2,
1k4, 1k5, 1k6, 1k8, 2k, 2k2, 2k4, (x10) 1k4, 1k6, 1k8, 2k1, 2k5, 3k, 3k5, 4k2, 5k,
6k, 7k, 8k4, 10k, 12k, 14k, 15k, 16k, 18k, 20k, 22k, 24kHz
Q (width) switched 5 positions 6, 9, 12, 15, 18dB per octave

Passive, switched amplitude to -20dB to +20dB in 0.5dB, 1dB or 2dB steps,
shelf or peak-dip curve, switched 3k, 4k, 6k, 8k, 10k, 12k, 15k, 17k, 20k, 25kHz

External AC supply, 150w toroidal transformer, 4 pin cable 90v ac isolated,
100-240v selectable 50/60Hz, 150w max

19 x 7 x 15 in (482 x 178 x 380mm)
40lbs (13.6 kg)

AD2077 SPECIFICATIONS

Avalon reserves the right to incorporate changes in design and in the specifications of this product without prior notice.

Pure Class A music recording systems since 1985.

AVAL ON

DESIGN

AVALON DESIGN PURE CLASS A AD2077 DUAL MONO, MASTERING EQUALIZER