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amplificatore-finale-stereo-ch-precision-a1
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AMPLIFICATORE FINALE STEREO CH PRECISION A1
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AMPLIFICATORE FINALE STEREO CH PRECISION A1
Finale di potenza stereo (tramite scheda opzionale Analog_BUF). Potenza 2 x 100W su 8 ohm in stereo o bi-amp e 1 x 350W su 8 ohm in mono a ponte. Pura classe A a discreti senza condensatori sul percorso del segnale per buffer di ingresso e configurazione in classe AB per la sola parte di potenza. Circuitazione simmetrica dual-mono. Trasformatore di alimentazione da 1200VA montato su un particolare silent-block, è collegato a un blocco di condensatori a 4 poli da 4X47.000 mF con sezioni separate per i circuiti di ingresso, driver e le sezioni finali. Possibilità di variare la controreazione da 0% a 100% con step del 20%, in modo da trovare il miglior interfacciamento con i diffusori. Collegamenti interni e terminali di uscita in argento. In dotazione solo un ingresso mono, selezionabile tra RCA, XLR e BNC. Per l’utilizzo in stereo, è necessario l’acquisto della scheda Analog_BUF. Display a colori RGB Amoled con risoluzione 480×272 pixels. Ingresso USB per aggiornamenti software. Controllo remoto tramite presa Ethernet.
Altre caratteristicheAnalog Input Stage
- Pure class A, fully symmetrical design
- Fully discrete, ultra low noise, high slew rate design
- No capacitor in the audio signal path
Analog Output Stage
- Amplifi er output stage and listening room temperatureindependent bias, Patent-pending ExactBias circuitry
- Output stage power transistors die and heat sink temperature constantly monitored
- Pure class A ultra low noise driver and class AB pure follower power stage
- No output relay
- Argento loudspeaker binding posts and internal wiring
Power Supply
- 1200VA power transformer mounted on silent-blocks for minimal vibration transmission
- Magnetically and electrostatically shielded transformers
- Hyper fast soft recovery diode bridge rectifi ers
- 4-pole 47’000uF reservoir and fi ltering capacitors
Global Versus Local Feedback Ratio
- Ratio ranging from 0% – local feedback only – to 100% -global feedback only – in 20% steps
- Feedback ratio can be set on the fl y from the user interface
- Adjust feedback ratio according to a given loudspeaker or even each specifi c driver in bi-amplifi cation modes
Gain Trimming
- Trim input gain to accommodate loudspeaker sensitivity and room size
- 24dB range in 0.5dB steps
Protections
- Non-invasive output stage voltage, current as well as power transistors die and heat sink temperature monitoring
- Protection procedures in case of output short circuit, open connection or excessive temperature
- Instantaneous output power and amplifi er temperature can be displayed on the front panel
Analog inputs
| Inputs type | Balanced (XLR), one connector per board Single-Ended (RCA & BNC), one connector per board |
| Input impedance | Balanced: 94kΩ Single-Ended: 47kΩ or 300Ω |
| Input stage | JFET input stage Ultra-low noise, discrete fully differential stage 24dB range adjustable gain in 0.5dB steps |
Amplification
| Amplification stage | Ultra-low noise full discrete class AB design 5 pairs of complementary output transistors |
| Bias | Patent-pending bias circuitry for constant bias operation |
| Feedback | User-adjustable local vs. global feedback ratio, from 0% to 100% with 20% steps |
| Bandwidth | DC to 450kHz (-3dB) at 1W into an 8Ω resistive load |
| Signal to Noise Ratio | Better than 115dB in stereo and bi-amp modes Better than 118dB in bridge mode |
| Total Harmonic Distortion + Noise | Less than 0.1% with 0% global feedback Less than 0.01% with 100% global feedback |
Analog outputs
| Binding posts | Two pairs of Argento binding posts for loudspeakers connection |
| Monitoring | Non-intrusive DSP-based protection of the amplifier Instantaneous voltage & current values are permanently monitored for each channel |
| Protections | Short-circuit protected Disconnected loudspeaker detected Over-temperature of the heatsink, fans are activated if needed Over-temperature of the output transistors |
Power supply
| Transformer | 1’200VA single transformer, oversized for low-noise operation |
| Power capacitors | 2x 47’000uF/63V 4-poles capacitors |
| Regulators | Non-regulated symetrical power supply for the power stages Eight local regulation stages for input/driver stages Seven local regulation stages for the logic/display |
General
| Display | 480×272 pixels, 24bits color, AMOLED |
| Mains operation | Selectable 100V, 115, 230V AC, 47-63Hz |
| Power supply consumption | <1W (standby), 1200W max in operation |
| Dimensions/Weight | 440 x 440 x 120mm (W x D x H), 43kg |
| Remote control | Ethernet interface, TCP/IP control |
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