PSI Audio Sub A225-M Sub Woofer / Bass Extension

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PSI Audio Sub A225-M Sub Woofer / Bass Extension



Full range accurate Subwoofer
For those who want more than just “some bass”: the A225-M is the ideal addition to any PSI Audio monitoring system, granting the same trademark fidelity to the lowest frequencies – precision down to 24 Hz!

Product Description

An exceptional piece of acoustic design, the A225-M sub-woofer/bass extension is equally suited to use as a mono sub-woofer in a surround sound application or as a bass extension in a stereo system.

Designed to work in harmony with the A225-M Sub, all PSI Audio ‘A’ series speakers feature a frequency response roll-off function that, when combined with the A225-M Sub, extends the frequency range down to an incredible 24 Hz, whilst maintaining a flat response.

The powerful class G outputs feature PSI Audio‘s unique “AOI” output stages, giving the A225-M an unprecedented impulse behavior.

Each driver and amplifier unit is secured by a protection circuit, which is monitored by a red LED on the front panel.

The electronics are housed in a unit mechanically isolated from the speaker cabinet to avoid resonance at high sound pressure levels.

To provide stability and avoid cabinet resonance A225-M is built with a double-box design, combining two cabinets into a single beautifully finished unit.


Product Key Features

  • Built in anti-resonance system in a double box cabinet.
  • Class G low temperature amplifier stage.
  • Amplifier unit acoustically uncoupled from speaker cabinet.
  • Real balanced input with outputs for satellite systems.
  • Protection circuits with overload indicator.
  • Designed for stereo and multichannel monitoring.
  • Magnetically shielded for use close to video monitors.
  • Phase and amplitude response compatible with all PSI Audio monitors.
  • AOI Technology.
  • CPR Technology.
  • PSC Technology.
  • 100% Analog – No DSP
  • Flat frequency response
  • Coherent to each monitor
  • R&B compatible
  • Class G/H Amplifiers
  • Individually calibrated
  • 5+1 years warranty
  • Handmade in Switzerland


Add control on your surround setup or on low frequencies

If you use a surround system or are working with several different speakers, our R&B – Router & Bass management System – could save you a lot of time.

R&B is an 8 in / 8 out transparent matrix that will fit into A225-M and help you selecting the speakers you are working with.

Please note that R&B is an option for the Sub A225-M and is not included as standard.

Sub A225-M – Add low end to our whole range of studio monitors

The Sub A225-M is the perfect addition to any PSI Audio speaker setup. No matter if you are working with our compact A17-M or the large A25-M, the A225-M will seamlessly integrate with all our monitors. Simply engage the bass roll-off on the satellites and enjoy a full-range system that extends down to 24 Hz with all the linearity in frequency and phase that you are used to from our monitor speakers.



Additional information

Weight 24 kg
Dimensions 50 × 32 cm

Metal Black, Pure White, Studio Red