ACCUPHASE A46

The A-46 uses latest instrumentation amplifier topology throughout, which allows fully balanced transmission in all signal handling stages. The power amplifier section features further improved MCS+ topology and the renowned current feedback approach. This results in electrical characteristics that surpass even the demanding standards set by its predecessors. Employing only highest grade materials and strictly selected parts, the A-46 realizes very low output impedance which ensures that constant drive voltage is available for the speakers.
The output stage features power MOS-FETs renowned for their excellent sound and superior reliability. For each channel, six of these devices are arranged in a parallel push-pull class A arrangement.

MOS-FETs have excellent frequency response characteristics and high input impedance, which reduces the load of the preceding (drive)stage. Driving these devices in pure class A means that constant power is always supplied, regardless of the presence or absence of a musical signal.

This makes the amplifier completely immune to external influences and ensures stable operation at all times.

• Pure Class A operation delivers quality power: 45 watts × 2 into 8 ohms
• Power MOS-FET output stage features 6-parallel push-pull configuration
• Instrumentation amplifier principle
• Further improved MCS+ circuit topology
• Current feedback combines stable operation with outstanding sound
• Bridged mode allows upgrading to true monophonic amplifier
• Large high-efficiency toroidal transformer
• 4-step gain control

Specifications of ACCUPHASE A46

● Continuous Average Output Power (20 - 20,000 Hz)

Note: Load ratings marked ( ＊ ) apply only to operation with music signals.

Stereo operation (both channels driven)

360 watts per channel into 1 ohm ( ＊ )

180 watts per channel into 2 ohms

90 watts per channel into 4 ohms

45 watts per channel into 8 ohms

Monophonic operation (bridged connection)

720 watts into 2 ohms ( ＊ )

360 watts into 4 ohms

180 watts into 8 ohms

● Total Harmonic Distortion

Stereo operation (both channels driven)

0.05% with 2 ohms load

0.03% with 4 to 16 ohms load

Monophonic operation (bridged connection)

0.05% with 4 to 16 ohms 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)

(in stereo and bridged operation)

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

● Output Load impedance Stereo operation: 2 to 16 ohms

Bridged operation: 4 to 16 ohms

● Damping Factor 500

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

Stereo operation: 0.76 V for rated output

0.11 V for 1 watt output

Bridged operation: 1.51 V for rated output

0.11 V for 1 watt output

● Input Impedance Line: 20 kilohms Balanced: 40 kilohms

● Signal-to-Noise Ratio

(A-weighted, input shorted) 115 dB (GAIN selector in MAX position)

120 dB (GAIN selector in −12 dB position)

At rated output

● Speaker leakage level

at OFF setting -55 dB or less (10 kHz, 8 ohm load)

● Output Level Meters -60 dB to +3 dB (indication in dB and %)

Logarithmic scale, with illumination off switch and

sensitivity selector (-20 dB)

● Power Requirements AC 120 V/220 V/ 230 V, 50/60 Hz

(Voltage as indicated on rear panel)

● Power Consumption 200 watts idle

410 watts in accordance with IEC 60065

● Maximum Dimensions

  Width 465 mm (18-5/16")

Height 211 mm (8-5/16")

Depth 464 mm (18-1/4")

● Mass 31.9 kg (70.3 lbs) net

39.0 kg (86.0 lbs) in shipping carton

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