Accuphase A-48 Stereo Power Amplifier

₹ 1,349,999.00

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Ooberpad announces the availability of the power-packed Accuphase A-48 Stereo Power Amplifier. Feature-packed with 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 remarkable 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 absolute peace of mind. This power amplifier is the most stellar instrument for immersive music appreciation on the highest level.

Warranty

1-year manufacturer's warranty

Key Features:

  • 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

      Benefits of Accuphase A-48 Stereo Power Amplifier:

      Instrumentation amplifier topology for improved noise performance
      Instrumentation amplifier topology for improved noise performance

      The A-48 employs an instrumentation amplifier configuration that is highly effective in keeping external noise from affecting the signal transmission lines. Furthermore, the input stage is designed for high gain (22 dB) and the power amplification stage for low gain (6 dB). Consequently, the signal emerging from the signal input section has a large amplitude which makes it much less prone to external interference, thereby further improving the noise performance.

      Signal input section with high gain
      Signal input section with high gain

      Similar to the higher-ranked A-75, the signal input stage of the A-48 is entirely configured with low-noise discrete circuit components. This makes it possible to design the circuit for a high gain of 22 dB (a multiplication factor of approx. 12.5), something that cannot be achieved with OP amp ICs. As a result, the S/N ratio of the amplifier is an astonishing 117 dB.

      Linear output characteristics over entire load impedance range

      The power amplification stage employs a 6-parallel push-pull arrangement of power MOS-FETs mounted directly to large heat sinks for highly efficient thermal dissipation. The result is fully linear power progression of 45 watts into 8 ohms, 90 watts into 4 ohms, 180 watts into 2 ohms, and 360 watts into 1 ohm (music signals). Plus, the impressive damping factor of 800 means that the amplifier can easily and competently drive any kind of loudspeaker.

      Where to buy?
      Buy the Accuphase A-48 Stereo Power Amplifier online at the best price in Mumbai, Delhi, Bangalore, Chennai and all across India. Enjoy expert, prompt and courteous customer service from the Ooberpad team. We will help you choose better and give you all the support you need to take the right buying decision in India.

      Technical Specifications of Accuphase A-48 Stereo Power Amplifier:

      Brand & Model # Accuphase A-48
      Continuous Average Output Power (20 - 20,000 Hz)
      • Stereo operation (both channels driven): 360 W/ch 1-ohm load (*) 180 W/ch 2-ohm load 90 W/ch 4-ohm load 45 W/ch 8-ohm load
      • Monophonic operation (bridged connection): 720 W 2-ohm load (*) 360 W 4-ohm load 180 W 8-ohm load
      Total Harmonic Distortion
      • Stereo operation (both channels driven): 0.05% with a 2 ohm load 0.03% with a 4 to 16 ohm load
      • Monophonic operation (bridged connection) 0.05% with a 4 to 16 ohm load
      Intermodulation Distortion 
      • 0.01%
        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
        • Gain selector at MAX 117 dB
        • Gain selector at í12 dB 122 dB
        Damping Factor
        • 800
        Input Impedance
        • Balanced: 40 kilohms
        • Line: 20 kilohms
        Signal-to-Noise Ratio (A-weighted, with input shorted)
        • 122 dB (GAIN selector in MAX position)
        • 128 dB (GAIN selector in –12 dB position)
        Power Consumption
        • 180 watts idle
        • 427 watts in accordance with IEC 60065
        Maximum Dimensions
        • Width 465 mm (18.31”)
        • Height 211 mm (8.31”)
        • Depth 464 mm (18.27”)
        Weight
        • 33.0 kg (72.8 lbs)

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