AVALON Design AD2022 - Dual Mono Pure Class A Preamplifier
L'AD2022 è la quarta generazione di preamplificatori microfonici di Classe A completamente discreti e simmetrici di Avalon. Il dual mono AD2022 include le capacità sonore originali e la trasparenza dei preamplificatori M2, M22 e M5 oltre a diverse funzionalità aggiuntive, tra cui il caricamento della sorgente del microfono selezionabile per un abbinamento cavo / microfono ottimizzato, alimentatori regolati di Classe A ad alta tensione migliorati, due strumenti ad alta Z ingressi, filtro passa-alto passivo variabile, cablaggio di qualità / argento e circuiti stampati con doppia placcatura per un trasferimento del segnale di livello basso superiore.
Caratteristiche principali
- 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
Caratteristiche tecniche
| 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) |
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