A-48 Stereo Power Amplifier
A-48 Stereo Power Amplifier
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A-48 Stereo Power Amplifier

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A-48 Stereo Power Amplifier

Featuring a six-fold parallel push-pull architecture with power MOS-FETs, as well as ideal gain allocation realized with discrete semiconductors in an instrumentation amplifier configuration, the A-48 harnesses a wealth of advanced technology. Its outstanding performance is exemplified by a signal/noise ratio of 117 dB, output of 360 watts into 1 ohm (music signals), and a damping factor of 800. The newly designed output protection circuit can detect any short-circuiting of the speaker terminals, for complete peace of mind. This power amplifier is the ultimate instrument for immersive music appreciation on the highest level.

  • 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
  • Instrumentation amplifier principle
  • High-gain signal input section in discrete configuration
  • Dedicated power supply for signal input section
  • Polarity switching for balanced input connectors
  • MCS+ circuit topologys
  • Current feedback principle in amplification circuitry
  • Protection circuitry using MOS-FET switches
  • High damping factor of 800
  • Speaker output protection circuit guards against short-circuiting
  • Two sets of large speaker terminals
  • 4-step gain control
  • Support for bi-amping and bridged mode
  • Aluminum top plate with hairline finish




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

Load 8 ohms 4 ohms 2 ohms 1 ohm
Normal / Bi-amping connection 45 W 90W 180W 360W*1
Bridged connection 180W 360W 720W*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% 


(A-weighted, with input shorted)

At rated continuous average output

Gain selector at MAX 117dB
Gain selector at -12dB 122dB 
Damping Factor


Frequency Response

At rated continuous average output: 20 - 20 000 Hz + 0 - 0.2dB

At 1 watt output: 0.5 - 160000Hz +0 - 3.0dB



Selector position MAX -3dB -6dB -12d-B 
Normal / Bridged / Bi-amping connection 28.0dB 25.0dB 22.0dBn 16.0dB
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 Meter



Format Logarithmic scale, with indication switch
Display range 

-infinite to +3dB

(indication in db and %)

Hold time infinite
In bridged mode Same indication for left and right
Power Requirements 120/220/230 V AC, 50/60 Hz
Power Consumption

180 watts idle

427 watts in accordance with IEC 60065

Maximum Dimensions

Width: 465mm (18.31")

Height: 211mm (8.31")

Depth: 464mm (18.27")


33.0kg (72.8 lbs) net

40.0kg (88.2 lbs) in shipping carton



*1 With music signals only

*2 1-ohms load. permissible with music signals only

*3 2-ohms load permissible with music signals only

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