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User Manual for Avalon Design AD2022 Dual Mono Pure Class A Preamplifier Click to enlarge the picture
Contents of the user manual for the Avalon Design AD2022 Dual Mono Pure
- Product category: Microphone Preamps Avalon Design
- Brand: Avalon Design
- Description and content of package
- Technical information and basic settings
- Frequently asked questions – FAQ
- Troubleshooting (does not switch on, does not respond, error message, what do I do if...)
- Authorized service for Avalon Design Microphone Preamps
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User manual for the Avalon Design AD2022 Dual Mono Pure contain basic instructions
that need to be followed during installation and operation.
Before starting your appliance, the user manual should be read through carefully.
Follow all the safety instructions and warnings, and be guided by the given recommendations.
User manual is an integral part of any Avalon Design product,
and if it is sold or transferred, they should be handed over jointly with the product.
Following the instructions for use is an essential prerequisite for protecting
health and property during use, as well as recognition of liability on the part of the manufacturer
for possible defects should you make a warranty claim. Download an official Avalon Design user manual in which you will find instructions on how to install, use, maintain and service your product.
And do not forget – unsuitable use of a Avalon Design product will considerably shorten its lifespan!
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Product description The AD2022 Dual Mono Symmetrical Pure Class A Preamplifier from Avalon Design includes the original sonic capabilities and transparency of M2, M22, and M5 Preamplifiers and 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, polytetrafluoroethylene / silver wiring, and double-plated circuit boards for superior low level signal transfer.
The AD2022 Preamplifier incorporates an advanced, high-performance microphone transformer. 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. Input signal selector, high pass filter, polarity-phase reverse, 48V power, and the 20 dB input attenuator 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.
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 high level headroom capability, improves transient response, and doubles the internal bandwidth of the high performance pure Class A signal amplifiers.
The high-current, DC-coupled, discrete Class A amplifiers are utilized for the output drive interface with 36 dB capability into all known loads. Two large, high-quality analog VU meters indicate accurate signal readings, while bi-color LEDs offer peak indication at 0 and 20 dB. - Symmetrical Pure Class A design, two channels
- Microphone and Hi-Z instrument inputs
- Gain switched 4 dB steps plus ±3 dB fine output trim
- Selectable microphone input impedance matching
- High quality, low-ratio, balanced input transformer
- Balanced, high-current Class A output to 36 dB
- Large illuminated analog VU meters and twin peak LEDs
- Regulated phantom power supply of 48V
- Input polarity phase reverse
- High headroom 36 dB input before overload
- 20 dB input pad for high level signals
- Sealed silver relays for all signal routing
- External 150W AC toroidal power chassis
- Fully discrete Class A-regulated audio power supplies
- Deep, musical sound-stage, transparent amplification
In the Box Avalon Design AD2022 Dual Mono Pure Class A Preamplifier (Black) External Toroidal B2T Power Supply 8.0' (2.4m) 4-Pin Power Cable 8.0' (2.4m) AC Cable Limited 1-Year Warranty Table of Contents
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Technical parametersAvalon Design AD2022 Specs | Topology | Circuit: 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 1,500 Ω input load selection | | Mic | Maximum Level: 36 dB balanced XLR 2-pin hot (with -20 dB passive attenuator) | | Maximum Level | Instrument: 18 dB at 100 kΩ instrument input level, standard mono 1/4" jack | | Input Attenuator | -20 dB resistive pre transformer primary, sealed silver relay | | Phantom Power | 48 V regulated 50 mA capability, sealed silver relay | | Filter | High Pass Filter: Passive, variable from 30 to 185 Hz @ 6 dB/octave, sealed silver relay | | Polarity | Reverse: Sealed silver relay on microphone input | | Gain Range | Input: 20 to 64 dB (in 4 dB steps)
Output: ±3 dB variable conductive plastic potentiometer | | Output Level | Maximum: 36 dB balanced 600 Ω, DC coupled, discrete symmetrical Pure Class A | | Output Type | XLR connector, 2-pin hot | | Noise | -126 dB 150 Ω (EIN unweighted)
-102 dB (20 kHz unweighted) | | Distortion | THD, IMD: 0.05% nominal | | Frequency Response | -3 dB: 1 Hz to 12O kHz transformer limit | | Bandwidth | System: DC to 1 MHz | | Meter | High quality, illuminated analog VU meter (0 dB equals to 4 dB) (output meter)
Bi-color LEDs
0 and 20 dB peak detection circuit (peak meter) | | Power Supply | B2T: External toroidal 100 to 240 VAC, 50 to 60 Hz selectable, 150 W maximum Power supply included. | | Dimensions | Preamplifier Unit: 19.00 x 12.00 x 3.50" (482.60 x 304.80 x 88.90 mm)
B2T Power Supply: 5.00 x 7.00 x 3.25" (127.00 x 177.80 x 82.55 mm) | | Weight | Preamplifier Unit: 15.0 lb (6.8 kg)
B2T Power Supply: 7.0 lb (3.1 kg) | | | | Package Weight | 29.6 lb | | Box Dimensions (LxWxH) | 24.7 x 22.5 x 8.8" |
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