Amplificator de putere Accuphase A-70

Full Description

Overview

Ushering in a New Era The Ultimate Pure Class A Stereo Power Amplifier. Input stage features fully balanced signal paths realized with ultra low noise instrumentation amplifier topology in discrete configuration. MCS+ design and current feedback in amplification circuitry deliver S/N ratio and sound quality on a level unrivaled by any stereo power amplifier. Massive power supply and power MOS-FET devices in ten-parallel push-pull configuration sustain linear power output progression down to impedances as low as 1 ohm. Output stage with further lowered impedance realizes a damping factor of 800.

 

Specs

Continuous Average Output Power (20 – 20,000 Hz):

Stereo operation (both channels driven):

480 watts per channel into 1 ohm (＊)

240 watts per channel into 2 ohms

120 watts per channel into 4 ohms

60 watts per channel into 8 ohms

 

Monophonic operation (bridged connection):

960 watts into 2 ohms (＊)

480 watts into 4 ohms

240 watts into 8 ohms

 

Total Harmonic Distortion:

Stereo operation (both channels driven):

0.07% with 2 ohm load

0.03% with 4 to 16 ohm load

 

Monophonic operation (bridged connection):

0.05% with 4 to 16 ohm load

 

Intermodulation Distortion: 0.01％

 

Frequency Response :

At rated output: 20 – 20,000 Hz ＋0, －0.2 dB

At 1 watt output: 0.5 – 160,000 Hz ＋0, －3.0 dB

 

Gain: 28.0 dB (with GAIN selector at MAX)

(Stereo and monophonic operation)

 

Gain Selection: MAX, －3dB, －6dB, －12dB

 

Output Load impedance:

Stereo operation: 2 to 16 ohms

Monophonic operation: 4 to 16 ohms

With music signals only, 1-ohm loads are permissible for stereo operation

and 2-ohm loads for monophonic operation.

 

Damping Factor: 800

 

Input Sensitivity (with 8-ohm load, GAIN selector in MAX position):

Stereo operation:

0.87 V for rated continuous average output (60 W)

0.11 V for 1 watt output

 

Monophonic operation:

1.74 V for rated continuous average output (240 W)

0.11 V for 1 watt output

 

Input Impedance:

Balanced: 40 kilohms

Unbalanced: 20 kilohms

 

Signal-to-Noise Ratio (A-weighted, input shorted):

121 dB (GAIN selector at MAX)

127 dB (GAIN selector at －12 dB)

At rated continuous average output

 

Output Level Meters :

Digital meter: 5-digit indication,selectable range 10 W / 100 W / 1,000 W

Bar graph meter: 32-point scale

Peak hold time: 1 second / infinite , switchable

Display off switch provided

Monophonic operation: same value for left/right

 

Power Requirements:

AC 120 V/230 V, 50/60 Hz

 

Power Consumption:

280 watts idle

530 watts in accordance with IEC 60065