Accuphase A-47 Stereo Power Amplifier AC100V

The A-47 is a full-fledged "class A stereo power amplifier" that has been completely redesigned from the A-46 based on the design technology developed for the higher-end model, and has been refined to provide an attractive sound quality.

The A-47's output element uses a high-performance audio power MOSFET, with 6 parallel push-pull pure class A drive per channel.

This makes it possible to lower the impedance of the amplifier output and enable constant voltage drive that corresponds to low impedance loads, with outputs of 45W/8Ω, 90W/4Ω, and 180W/2Ω per channel, which are linear with respect to the load impedance. Realizing power.

Furthermore, you can get 360W (limited to music signals) with an ultra-low impedance load of 1Ω.

The input circuit uses an "instrumentation amplifier" configuration. In this method, the entire power amplifier including the signal input stage constitutes a balanced amplifier, and the signal path from the input terminal to the power amplifier stage is fully balanced. You can also use a bridge connection to upgrade to a high-output monophonic amplifier with 180W/8Ω, 360W/4Ω, or 720W/2Ω (music signal).

・Pure class A operation, quality power of 45W/8Ω x 2 ・Output stage is 6 parallel push-pull configuration of "power MOSFET" ・Amplification section uses instrumentation amplifier method ・More advanced "MCS+" Equipped with circuitry - Current feedback amplification circuit that boasts excellent sound quality and stability - Upgraded to monophonic amplifier by bridge connection - Highly efficient large toroidal transformer - 4-stage gain control possible

Rated continuous average output (between 20 and 20,000Hz)

Note: Loads marked with (*) are limited to music signals.

In stereo mode

360W/ch 1Ω load (*) (both channels operate simultaneously)

180W/ch 2Ω load

90W/ch 4Ω load

45W/ch 8Ω load

In monophonic specification

720W 2Ω load (*) (bridge connection)

360W 4Ω load

180W 8Ω load

● Total harmonic distortion rate

In stereo mode (both channels operate simultaneously)

0.05% 2Ω load

0.03% 4~16Ω load

Monophonic specification (bridge connection)

0.05% 4-16Ω load

● IM strain rate 0.01%

● Frequency characteristics At rated continuous average output: 20 to 20,000Hz +0 -0.2dB

At 1W output: 0.5 to 160,000Hz +0 -3.0dB

● Gain (gain) 28.0dB (GAIN switch: MAX)

(For stereo/monophonic specifications)

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

●Load impedance: 2-16Ω for stereo specifications

4 to 16 Ω when monophonic

● Damping factor 600

● Input sensitivity (8Ω load, GAIN switch: MAX)

Stereo specification: 0.76V at rated continuous average output

0.11V 1W output

Monophonic specification 1.51V at rated continuous average output

0.11V 1W output

● Input impedance balanced 40kΩ, line 20kΩ

● S/N (A correction, input short) 116dB GAIN switch MAX 121dB GAIN switch -12dB at rated continuous average output

● Output meter -40dB to +3dB (dB/% display)

Logarithmic compression type, display off function, meter sensitivity switching function (-20dB)

● Power supply AC100V 50/60Hz

● Power consumption

200W No input

410W Electrical Appliance and Material Safety Law

280W at 8Ω load rated output

● Maximum external dimensions Width 465mm x Height 211mm x Depth 464mm

● Mass 32.1kg