Pioneer Spec 4 Power Amplifier

Pioneer Spec 4 Power Amplifier


The Spec-4 employs DC construction which excludes capacitors from the NFB circuits and uses a dual transistor differential amplifier with a current mirror circuit in the 1st stage.

This provides a stable operation and also high gain over a wide frequency range.

The pre-driver stage is a class A circuit with a regulated current circuit for the load.

This makes for high gain amplification with superior linearity.

Furthermore, there is an overdrive limiter and power limiter circuit which is designed to protect the power transistors and make for added reliability.

Power output: 150 watts per channel into 8Ω (stereo)

Frequency response: 5Hz to 100kHz

Total harmonic distortion: 0.01%

Damping factor: 100

Input sensitivity: 1V

Signal to noise ratio: 115dB

Speaker load impedance: 4Ω to 16Ω

Semiconductors: 2 x IC, 61 x transistors, 62 x diodes

Dimensions: 480 x 187 x 445mm

Weight: 24.5kg


It would be our pleasure to demonstrate this product in store for you, contact us to arrange an appointment

Available for in store collection only or a courier may be discussed pre purchase

All vintage and used equipment that we supply is sold with a full one year warranty

Please contact us if you own gear that you’d like to sell, or that would benefit from service / repair or an upgrade


Absolute beast of a power amplifier, pure class A Japanese power.

We have the matching Spec 1 pre to go with it, a formidable pair. Listing here.

£4000 for the pair.

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