Sub A225-M – Powerful accurate subwoofer

“The real trick is to simultaneously provide a pure neutral processed signal and bypass all the obstacles on the road to obtain it. PSI Audio staff challenged laws of physics and mechanical constraints. Engineers from the company PSI Audio mastered this art.”

– Estrada iStudio!, Poland


Product Description

225_FRONT_half_LAn 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.


Product Documents

Sub A225-M Technical Data:    PSI Audio Sub A225-M Tech Data

User Manual:  UserManual_5_0

Brochure: PSI Audio Brochure 2015

Product Data

Power RMS: 200 W
Program Power: 300 W
Input Impedance: Sym, 10k Ohms
Sensitivity 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: 116dB / half space
Response at -6dB: 24 - 100 Hz
Tolerances: ±2 dB (28Hz - 65Hz)
Distortion THD: less than 1.5% (50Hz-200Hz)
System: 1 Way
Crossover frequency: 90Hz
Woofer's dim. Ext. / Diaphragm: 2x Ø 258 mm / Ø 210 mm
Connectors: 2 x XLR F / 2 x XLR M
Signal input: 1=GND, 2=(+), 3=(-)
Material: MDF / double box
Dimensions W x H x D mm: 320 x 700 x 500
Gross / Net Weight: 43.1 / 38.4
Voltage: 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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