P-4500 Stereo Power Amplifier
P-4500 Stereo Power Amplifier
P-4500 Stereo Power Amplifier
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P-4500 Stereo Power Amplifier

How to enquire ?

Give us a call at (07) 3854 0406 or shoot us an email at info@trimira.com.au to enquire about this product.

Tax included.


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





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...