Accuphase A-48 Stereo Power Amplifier

Features

Pure Class A stereo power amplifier with outstanding S/N ratio and very high damping factor

Rated for 45 watts into 8 ohms and 360 watts into 1 ohm

Power MOS-FETs in 6-parallel push-pull configuration

Linear output characteristics over entire load impedance range

Strong power supply with massive toroidal transformer and large 60,000 μF filtering capacitors

High-gain signal input section in discrete configuration

Instrumentation amplifier principle

Dedicated power supply for signal input section

All signal paths realised with discrete semiconductor components

Balanced Remote Sensing

MCS+ circuit topology

Current feedback amplification principle

Speaker output protection circuit guards against short-circuiting

Line and balanced input connectors

Highly responsive large peak power meters

Two sets of large speaker terminals

4-step gain control

Support for bi amplification and bridged mode

Aluminium top plate with hairline finish

Specifications

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

Load 8 ohms 4 ohms 2 ohms 1 ohm

Normal / Bi-amping connection 45 W 90 W 180 W 360 W*1

Bridged connection 180 W 360 W 720 W*1 -

Total Harmonic Distortion

Load 2 ohms 4 to 16 ohms

Normal / Bi-amping connection 0.05% 0.03%

Bridged connection - 0.05%

Intermodulation Distortion 0.01%

S/N Ratio (A-weighted, with input shorted) At rated continuous average output

Gain selector at MAX 117 dB

Gain selector at -12 dB 122 dB

Damping Factor 800

Frequency Response

At rated continuous average output 20 - 20,000 Hz (+0, -0.2 dB)

At 1 watt output 0.5- 160,000 Hz (+0, -3.0 dB)

Gain

Selector position MAX -3dB -6 dB -12 dB

Normal / Bridged / Bi-amping connection 28.0 dB 25.0 dB 22.0 dB 16.0 dB

Input Impedance

Balanced input 40 kilohms

Line input 20 kilohms

Output Load Impedance

Normal / Bi-amping connection 2 to 16 ohms*2

Bridged connection 4 to 16 ohms*3

Power Meters

Format Logarithmic scale, with indication off switch

Display range -8 to +3 dB (indication in dB and %)

Hold time 8

In bridged mode Same indication for left and right

Power Requirements

120 V/220 V/230 V AC, 50/60 Hz (Voltage as indicated on rear panel)

Power Consumption

Idle 180 watts

In accordance with IEC 60065 427 watts

Maximum Dimensions

Width 465 mm (18.31”)

Height 211 mm (8.31”)

Depth 464 mm (18.27”)

Mass

Net 33.0 kg (72.8 lbs)

In shipping carton 40.0 kg (88.2 lbs)

*1 With music signals only

*2 1-ohm load permissible with music signals only

*3 2-ohm load permissible with music signals only