Cart 0

Accuphase P-4500 Stereo Power Amplifier


P-4500 Stereo Power Amplifier

The quest for the optimal power amplifier has just taken another giant leap forward. The P-4500 features an instrumentation amplifier configuration realized with discrete semiconductors in the signal path, triple Darlington 4-parallel complementary push-pull architecture and many other technology advantages. The result is an impressive S/N ratio of 121 dB, rated output of 500 watts into 1 ohm (music signals), and a damping factor of 700. A newly developed output protection circuit can also detect any short-circuiting of the speaker terminals, for complete peace of mind. This power amplifier is the ultimate tool for immersive music enjoyment on the highest level.

  • Power amplification stage with 4-parallel complementary push-pull configuration
  • Linear output characteristics (90 W / 8 ohms, 180 W / 4 ohms, 360 W / 2 ohms)
  • 500 W output into ultra-low impedance load of 1 ohm (music signals)
  • Instrumentation amplifier principle
  • Current feedback topology
  • Balanced Remote Sensing
  • High damping factor of 700
  • Speaker output protection with short-circuit detection
  • Highly responsive large peak power meters
  • Support for bi-amping and bridged mode

        Download the Brochure here.

        Download the Fact Sheet here.


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

        Stereo Operation (both channels driven:  

        500 W/ch = 1-ohms load *

        360 W/ch = 2-ohms load

        180 W/ch = 4-ohms load

        90 W/ch = 8-ohms load

        Monophonic Operation:

        1000 watts = 2 ohms load*

        720 watts = 4 ohms load

        360 watts =  8 ohms load


        Ratings marked. with * are for music signals only

        Total Harmonic Distortion

        Stereo operation ( both channels driven )

        0.05% with a 2-ohm load

        0.02% 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 - 0.2dB

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


        28.0dB ( GAIN selector in MAX position)

        (Stereo/monophonic operation)

        Gain Selector


        Selector position MAX -3dB -6dB -12dB
        Gain (dB) 28 25 22 16
        Output Load Impedance

        Stereo Operation: 2 to 16 ohms

        Monophonic Operation: 4 to 16 ohms

        * With music signals only, 1-ohm loads are permissible for stereo operation and 2-ohm loads for monophonic operation.

        Damping factor 700
        Input Sensitivity ( with 8-ohm load)


        Stereo Operation

        1.07V for rated continuous average output

        0.11V for 1 watt output

        Monophonic Operation

        2.14V for rated continuous average output

        0.11V for 1 watt output

        Input Impedance

        Balanced: 40 Kilohms

        Line (unbalanced): 20 Kilohms

        Signal-to-Noise Ratio

        (A-weighted, with input shorted)

        121dB (GAIN selector in MAX position)

        126dB (Gain selector in  -12dB position)

        At rated continuous average output

        Output Level Meter

        Logarithmic scale, with indication off switch and -infinite to +3dB (indication in dB and %)

        Hold time switchable 3s / infinite

        *during monophonic operation, both meters show the same value

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

        62 watts idle

        485 watts in accordance with IEC 60065

        Maximum Dimensions

        Width: 465mm (18.31")

        Height: 190mm (7.48")

        Depth: 427mm (16.81")


        29.2kg (64.4lbs) net

        55.0kg (77.2lbs) in shipping carton



        Sometimes we want to listen to our brand new audio setup without having to worry about dragging B&W up two flights of stairs - that's where we come in! Not only are our team experts in high quality AV equipment, they're also professional bodybuilders* who can deliver and install your new toys quickly and efficiently.

        Our in-house team can service those in Brisbane, the Gold Coast, and the Sunshine Coast. Give us a call to get an obligation-free quote today!

        *the term 'professional bodybuilders' is used here loosely...