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PSI Audio A225

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Studio Active Subwoofer


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.



-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.

*Price per unit


Power RMS:


Program Power: 


Input Impedance: 

Sym, 10k Ohms

Sensivity for 100 dB @ 1m: 

0.775 V

Signal to Noise Ratio: 

116 dBA

Continuous Max SPL@1m: 

111 dB (single)

Input Overload: 

24 Vpp

Program Max SPL@1m: 

116 dB / half space

Response at -6dB: 

24 - 100 Hz


±2 dB (28Hz - 65kHz)

Distortion THD: 

less than 1.5% (50Hz-200kHz)


1 Way

Crossover frequency: 


Woofer's dim. Ext. / Diaphragm: 

2 x Ø258 mm / Ø210 mm


2 x XLR F / 2 x XLR M

Signal input: 

1=GND, 2=(+), 3=(-)


MDF / double box

Dimensions W x H x D mm: 

320 x 700 x 500

Gross / Net Weight: 

43.1 / 38.4 kg


115/230V (50-60Hz)

Consumption Standby-Quiescent-Max: 

1.7 - 4 - 200 W

Mean / Max Humidity: 

less than 75% / less than 90%

External Temperature: 

5 - 40°C

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