Accuphase E – 470

Planet Audio
Planet Audio
Planet Audio
Planet Audio

E-470 nasljednik je vrlo popularnog Accuphase integriranog pojačala E-460. Plod je sofisticiranog „know-how”-a koji je plod dugogodišnjih istraživanja i iskustava koje tvrtka ima u proizvodnji high-end uređaja.
Superiorna AAVA kontrole glasnoće u ovom pojačalu dodatno je usavršena. Radi se o patentiranom i već provjerenome revolucionarnom načelu koje od temelja redefinira sklop kontrole glasnoće. Umjesto digitalnog pristupa koji uključuje A/D i D/A procesiranje, AAVA sklop radi isključivo u analognoj domeni. Zato što su funkcije pojačavanja i kontrole glasnoće integrirane u jedan elektronički entitet, bez ijednog promjenjivog otpornika, zvukovne performanse i čistoća zvuka ne gube se tijekom godina, dodatno osiguravajući, kada je Accuphase u pitanju, ionako poslovično izvrsnu radnu pouzdanost uređaja. Sklop pojačala snage je potpuno balansirano ustrojen, što uz unaprijeđenu MCS+ tehnologiju i tvrtkino visoko cijenjeno načelo strujne povratne veze, omogućava sjajne elektroničke karakteristike uređaja. MOS-FET-ovi u izlaznom stupnju aranžirani su u trostrukoj push-pull konfiguraciji po kanalu. Imaju odličan frekvencijski odziv i visoku izlaznu impedanciju, što smanjuje opterećenje prethodnog pobudnog stupnja. Nazivna snaga E-470 pojačala je 2 x 180 W na 8 ohma.

The E-470 represents a model change from the popular E-460. It incorporates the sophisticated technological know-how gained by Accuphase over the years, and features a further refined AAVA volume control. It also marks a return to MOS-FET devices inclass A/B integrated amplifier from Accuphase.
AAVA is a revolutionary principle that redefines the concept of volume control from the ground up. Unlike the digital approach involving A/Dand D/A processing, it operates purely in the analog domain for high performance and ultimate sound. Because the amplification and volume control tasks are integrated in a single electronic entity without any variable resistors,performance and sonic purity do not deteriorate over the years, providing excellent reliability.
The power amplifier section is built as an advanced instrumentation amplifier, which enables fully balanced signal transmission throughout. Together with the further improved MCS+ circuit topology and the highly acclaimed current feedback principle, this makes for even better electrical characteristics.
In the output stage, high-power MOS-FETdevices renowned for their great sound andutter reliability are arranged in a triple parallel push-pull configuration per channel. MOSFETshave excellent frequency response and high input impedance which reduces the load on the preceding driver stage.

  • Revolutionary AAVA volume control
  • Output stage with triple parallel push-pull power MOS-FETs delivers high quality power: 180 watts x 2 into 8 ohms
  • Instrumentation amplifier principle for power amplifier input stage allows fully balanced signal transmission, amplifier stage uses current feedback and MCS+ topology
  • Logic-control relays for straight and short signal paths
  • Robust power supply with large high-efficiency toroidal transformer and filtering capacity
Continuous Average Output Power (both channels driven, 20-20,000 Hz): 180 watts per channel into 8 ohms
Total Harmonic Distortion (both channels driven, 20~20,000 Hz): 0.05% with 4 to 16-ohm load
Intermodulation Distortion: 0.01%t
Frequency Response (high level input/power input): 20–20,000 Hz +0, –0.2 dB (for rated continuous average output)3–150,000 Hz +0, –3.0 dB (for 1 watt output)
Damping Factor: 500 (with 8-ohm load, 50 Hz)
Input Sensitivity (For rated input / For 1 W output (EIA)), Input Impedance: high level input: 190 mV, 14.2 mV, 20 kΩ balanced input 190 mV, 14.2 mV, 40 kΩ power in: 1.51 V, 113 mV, 20 kΩ
Output Voltage, Output Impedance: Pre Output: 1.51 V, 50 Ω (at rated continuous average output)
Gain: High level input -> Pre output: 18 dB power in -> output: 28 dB
Tone Controls (Turnover frequency and adjustment range): Bass: 300 Hz ±10 dB (50 Hz)Treble: 3 kHz ±10 dB (20 kHz)
Signal-to-Noise Ratio (at rated output / EIA S/N): high level input: 110 dB, 92 dB Balanced input: 93 dB, 92 dB power in: 123 dB, 100 dB
Load Impedance: 4–16 ohms
Power Requirements: AC 230 V 50/60 Hz(Voltage as indicated on rear panel)
Power Consumption: 60 watts idle 450 watts in accordance with IEC 60065
Maximum Dimensions: W 465 mm, H 181 mm, D 427 mm
Mass: 24.4 kg net, 30.0 kg in shipping carton