Monitor Audio IWA-250 Amplifier

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A component in the in-wall subwoofer system is the Monitor Audio IWA-250 switch mode amplifier: a slim, powerful dedicated design in a heavy-duty 1U rack mount case. Delivering up to 250 watts into 4 ohms, a single IWA-250 will power single or dual IWS-10s to provide higher power levels for larger rooms or to meet customer demands. The IWA-250 can be configured to switch on automatically using input signal sensing, or by using the preferred 12v trigger link from an AVR or system source. The IWA-250 will then automatically be switched on and off with the AVR, TV or system remote control handset.

The amplifier utilises a cool running Class D power stage driven by a PWM supply with integrated DSP. Filtering and functionality are controlled in the software for precise and reliable operation. The IWA-250 offers a choice of single LFE, balanced XLR and stereo RCA inputs. Output connection is made via two sets of push type terminals to provide connection to one or a pair of IWS-10 drivers. The front panel allows access to all control features for easy adjustment when fitted into a rack bay. An EQ switch offers a selection of music, movie and impact presets for the ideal response in-room. There is also an enclosure switch to calibrate the drive characteristics when the IWS-10 is used within or without the IWB-10 back box

IWA-250 Amplifier Features

  • Rigid, high quality steel case
  • Switch mode power supply
  • Class D power amplifier delivering up to 250watts into 4ohms (dual IWS-10 drivers)
  • High efficiency design resulting in cool running – low thermal output
  • DSP controlled with advanced limiters
  • <0.5watt standby power consumption (ErP certified)
  • DC short circuit protection, over-current and thermal protection


‘Connect' IP control: No

Channel Number: 2 (1 Stereo Pair)

Power: 150W @ 4 Ohms, 100W @ 8 Ohms, 320W Bridged @ 8 Ohms (1 Channel)

Input Impedance: 20 K Ohms

Output Impedance (Loop RCA): 600 Ohms

Input Sensitivity: 100 mV / 1 W – 1000 mV – Full power

Rack Height: 1U

Dimensions (Without feet) (H x W x D): 42.4 x 438 x 427 mm

Height (With feet): 52.8 mm

Width (Including rack brackets): 482 mm