Product description
-------------------
The Avalon AD2022 is Avalon s fourth generation of fully
discrete, symmetrical Pure Class A microphone preamplifiers. The
dual mono AD2022 includes the original sonic capabilities and
transparency of the M2, M22 and M5 preamplifiers plus several
additional features, including selectable microphone source
loading for optimized cable/mic matching, improved high-voltage
Class A regulated power supplies, two high Z instrument inputs,
variable-passive high pass filter, teflon/silver wiring and
doubled plated circuit boards for superior low level signal
transfer. Symmetrical Pure Class A design, two channels
Microphone and hi-Z instrument inputs Gain switched 4dB steps
plus +/- 3dB fine output trim Selectable microphone input
impedance matching Low noise -126dB EIN Ultra high quality,
low-ratio, balanced input transformer Balanced, high-current
Class A output to +36dB Large illuminated analog VU meters and
twin peak LED s Regulated phantom power supply +48v Input
polarity phase reverse High headroom +36dB input before overload
Input -20dB pad for high level signals Sealed silver relays for
all signal routing External AC 150w toroidal power chassis Fully
discrete Class A regulated audio power supplies Deep, musical
sound-stage, transparent amplification MICROPHONE INPUTThe AD2022
incorporates the most advanced high-performance microphone
transformer available. Split low-ratio primary windings are
carefully combined within a custom mu-metal core for extended
smooth frequency response and very low distortion. Sealer silver
relays are used for minimal signal invasion. The input signal
selector, high pass filter, polarity-phase reverse, +48v power
and the 20dB input attenuator all utilize local sealed relay
operation. A variable passive high pass filter provides a minimum
phase shift design while eliminating low frequency rumble, wind
noise and mechanical vibration at sub sonic frequencies.
SYMMETRICAL PURE
From the Manufacturer
---------------------
The AD2022 is Avalon's fourth generation of fully discrete,
symmetrical Pure Class A microphone preamplifiers. The dual mono
AD2022 includes the original sonic capabilities and transparency
of the M2, M22 and M5 preamplifiers plus several additional
features, including selectable microphone source loading for
optimized cable/mic matching, improved high-voltage Class A
regulated power supplies, two high Z instrument inputs,
variable-passive high pass filter, teflon/silver wiring and
doubled plated circuit boards for superior low level signal
transfer.
Microphone Input
The AD2022 incorporates the most advanced high-performance
microphone transformer available. Split low-ratio primary
windings are carefully combined within a custom mu-metal core for
extended smooth frequency response and very low distortion.
Sealer silver relays are used for minimal signal invasion. The
input signal selector, high pass filter, polarity-phase reverse,
+48v power and the 20dB input attenuator all utilize local sealed
relay operation. A variable passive high pass filter provides a
minimum phase shift design while eliminating low frequency
rumble, wind noise and mechanical vibration at sub sonic
frequencies.
Symmetrical Pure Class A Design
Two 100% discrete, high-voltage, symmetrical Pure Class A signal
amplifiers are utilized per channel. The first operates in a
cascaded-cascode FET configuration while the second stage
amplifier is fully bipolar. The twin amplifiers share the total
available gain requirement. This shared architecture increases
the high level headroom capability, improves transient response
and doubles the internal bandwidth of the ultra-high performance
pure Class A signal amplifiers.
Output and Metering
High-current DC coupled, Class A discrete amplifiers are
utilized for the output drive interface with +36dB capability
into all known loads. Two large, high-quality analog VU meters
indicate accurate signal readings while bi-color LED's offers
peak indication at 0dB and +20dB.
Features:
* Symmetrical Pure Class A design, two channels
* Microphone and hi-Z instrument inputs
* Gain switched 4dB steps plus +/- 3dB fine output trim
* Selectable microphone input impedance matching
* Low noise -126dB EIN
* Ultra high quality, low-ratio, balanced input transformer
* Balanced, high-current Class A output to +36dB
* Large illuminated analog VU meters and twin peak LED's *
Regulated phantom power supply +48v
* Input polarity phase reverse
* High headroom +36dB input before overload
* Input -20dB pad for high level signals
* Sealed silver relays for all signal routing
* External AC 150w toroidal power chassis
* Fully discrete Class A regulated audio power supplies
* Deep, musical sound-stage, transparent amplification AD2022
Specifications:
* Circuit Topology: Twin cascode FET and bipolar low level signal
amplifiers, high-voltage, 100% discrete, symmetrical Pure Class A
* Input Type and Load: Transformer balanced low-ratio, 50, 150,
600 and 1k5 ohm input load selection
* Maximum Mic Level: +36dB balanced XLR pin 2 hot (with -20dB
passive attenuator)
* Maximum Instrument Level: +18dB at 100k ohms instrument input
level, standard mono 1/4 inch jack
* Input Attenuator: -20dB resistive pre transformer primary,
sealed silver relay
* Phantom Power: +48v regulated 50mA capability, sealed silver
relay
* High Pass Filter: Passive, variable from 30Hz to 185Hz @ 6dB
per octave, sealed silver relay.
* Polarity Reverse: Sealed silver relay on microphone input
* Gain Range Input: +20dB to +64dB in 4dB steps
* Gain Output Range: +/- 3dB variable conductive plastic
potentiometer
* Maximum Output Level: +36dB balanced 600 ohms, DC coupled,
discrete symmetrical Pure Class A
* Output Type: XLR connector, pin 2 hot
* Noise EIN Unweighted: -126dB 150 ohm
* Noise 20kHz Unweighted: -102dB
* Distortion THD, IMD: 0.05% nominal
* Frequency Response -3dB: 1Hz to 120kHz transformer limit
* System Bandwidth: DC to 1MHz
* Output Meter: High quality, illuminated analog VU meter 0dB =
+4dB.
* Peak Meter: Bi-color LED's 0dB and +20dB peak detection
circuit.
* AC power supply B2T: External toroidal 100V to 240V, 50-60Hz
selectable, 150 watts maximum.
* Cables: 90V ac, 4 pin male power input connector, B2T required,
internal DC regulation
* Dimensions: 19 x 12 x 3.5 in (482 x 305 x 89mm)
* Weight: 15lbs (6.8kg)
* Dimensions - Shipping Carton: 24 x 21.5 x 7.5 in (610 x 546 x
190mm)
* Weight - Packed: 25lbs (11.4kg)
- Pure Class A dual microphone preamplifier. Variable-passive high pass filter..
- Microphone and hi-Z instrument inputs. Selectable microphone input impedance matching. -20dB pad..
- Balanced, high- current Class A output to + 36dB. Large illuminated VU meters & twin peak LED's..
- Teflon/silver wiring and doubled plated circuit boards for superior low level signal transfer..
- Regulated 48V phantom power supply. Input polarity phase reverse. High headroom +36dB input.