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AD2055:
Dual Mono, Pure Class A Parametric Music Equalizer |

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The
AD2055 combines 100% discrete, pure class A signal amplifiers
with state-of- the-art passive and active filter topologies.
The AD2055's unique circuitry delivers very high resolution
transient detail at the operational extremes of real world
equalization demands. The AD2055 auto-bias DC servo loop control
eliminates the need for all interstage capacitor coupling.
The AD2055 breathes life into all musical performances!

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AD2055 FEATURES
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Pure
Class A, 100% discrete design
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Smooth musical detail
and sonic excellence
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Minimum audio signal
path
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Dual mono operation
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Transparent active and
passive filter design
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High headroom +30dB
Very low noise -94dB
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Fully balanced inputs
and outputs
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DC coupled, no transformers
in audio path
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Switched frequencies
in high and low bands
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Mid bands use X10 frequency
for extended range
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Wide bandwidth -3dB
1Hz to 450kHz
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Low distortion less
than 0.5% THD and IMD
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All signal routing with
sealed silver relays Conductive plastic potentiometers
for low noise
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External 150W toroidal
power supply 100% discrete power supplies for audio path
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Long lasting, stainless
steel hardware
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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 studio's.
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!
| AD2055
SPECIFICATIONS |
| Circuit
Topology |
High-voltage
100% discrete, balanced and symmetrical Class A
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| Output Gain Range |
Unity
Gain |
| Maximum Input Level |
+30dB
balanced XLR pin 2 hot |
| Maximum Output Level |
+32dB
balanced 600 ohms, DC coupled, high-current discrete
Class A |
| Input
/ Output Type |
XLR
type, pin 2 hot balanced |
| Noise 20kHz Unweighted |
-94dB
(EQ in) |
| Distortion
THD, IMD |
0.5%
(typical 0.05% at +6dB 1kHz) |
| Frequency Response -3dB |
1Hz
to 450kHz (input band limited) |
| Equalizer
Type |
Passive
high and low bands plus two fully parametric mid bands
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| Bypass
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Hard-wire
relay bypass for equalizer in-out |
| Low
Band F1 |
Passive,
amplitude to -32dB to +32dB shelf or peak-dip curve
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| F1
Frequency Range |
Switched
10 position 18Hz, 25, 30, 50, 72, 100, 150, 215, 300,
450Hz |
| Mid
Band F2 |
Active,
amplitude to -16dB to +16dB peak-dip curve |
| F2
Frequency Range |
Variable
35Hz to 450Hz (x10) 350Hz to 4k5Hz, Q (width) 0.3 to
3.0 |
| Mid
Band F3 |
Active,
amplitude to -16dB to +16dB peak-dip curve |
| F3
Frequency Range |
Variable
160Hz to 2k0Hz (x10) 1k6Hz to 20kHz, Q (width) 0.3 to
3.0 |
| High
Band F4 |
Passive,
amplitude to -26dB to +26dB shelf or peak-dip curve
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| F4
Frequency Range |
Switched
10 position 1k5Hz, 2k5, 3k5, 5k, 7k2, 10k, 12k5, 15k,
20k, 25kHz |
| AC-DC
Power |
External
AC supply, 150w toroidal transformer, 4 pin cable 90v
isolated, |
| (B2T
Power Supply Included) |
100-240v
selectable 50/60Hz, 150w max |
| Dimensions
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19
x 3.5 x 12 in (482 x 88 x 305mm) |
| Shipping
weight |
30lbs
(13.6 kg) |
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