Monitor Audio Radius 390 Subwoofer

In stock
Radius 390

Monitor Audio Radius 390 Active Compact Subwoofer promises the astonishing low frequency resolution of the 380 with the added depth, impact and control of a larger bass engine, the Radius 390 demolishes assumptions of size versus performance. With every earth-shaking transient, you’ll be more convinced that the compact 390 is truly ‘ground-breaking’ in form and function.

A system of twin colour-coded 10” C-CAM® active/ABR drivers is powered by a 220W Class D amplifier to expand levels of output and extension, releasing a rich layer of penetrating bass, mesmerising in its consistency and scale. You’ll get agility as well, for rhythmic depth with music, and dynamic reinforcement in home theatre systems - all this from a beautiful little cube that liberates living space. In tune with Radius philosophy the 390 is perfect for lifestyle but sonically it’s in a class of its own. Enjoy rapid EQ optimisation from Impact, Music and Movie settings, and system automation via the 12V trigger.


  • 18mm MDF cabinet construction with internal bracing
  • Cool-running 220W Class D amplifier with switch mode power supply (SMPSU)
  • Twin side-firing 10” C-CAM® drivers - one active and one passive ABR  
  • Low pass filter switch – for LFE or Stereo input selection
  • Power switch with ON – Auto- Off/ trigger settings
  • Stereo/ LFE RCA inputs
  • 3 x Pre-set EQ settings – Music/Movie/Impact
Monitor Audio Radius 390 Warranty: 
Monitor Audio Active Subwoofers carry a 2 Year Warranty.

We are authorised Monitor Audio retailers. Brand new and complete with the full warranty.

  • System Format Active sub-woofer system
    • Auxiliary (ABR) loading
    • 18mm MDF cabinet
  • Low Frequency Limit:
    • 30Hz (- 6dB)
  • Upper Frequency Limit:
    • Variable 40 – 120 Hz @ 24dB/Octave
  • Amplifier Power Output 220 Watts @ 1% THD+N
  • Amplifier Classification:
    • Class D amplifier with Switch mode power supply (SMPSU)
  • Bass EQ Switch Music/ Movie/ Impact
  • Phase Control 0 & 180 degrees
  • Auto Sensing Line Level >3.5mV
  • Input Level Requirements:
    • Standby after approximately 15 minutes if no signal sensed
  • Input Impedance > 20K Ohms
  • Mains Input Voltage:
    • AC 110 - 120 V ~ 50/60Hz
    • AC 220 - 240 V ~ 50/60Hz (Factory Region Preset)
  • Connections:
    • Stereo RCA in
    • LFE in
    • 12v Trigger in (3.5mm mono mini-jack)
    • 12v Trigger Input 5 - 12v via 3.5mm mono mini-jack socket
  • Power Consumption 220 Watts / 0.5 Watts in Standby (ErP approved)

Including amp & feet:
(H x W x D) 348 x 330 x 345mm
(1311/16 x 13 x 129/16 Inches)
Weight (Unpacked)  13.76Kg (30lb 4oz)

Write Your Own Review
You're reviewing:Monitor Audio Radius 390 Subwoofer
Your Rating