Monitor Audio Radius 390 Subwoofer

In stock
Radius 390
SRP: £600.00 (£500 + VAT)

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)

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