Description
Monitor Audio IWA-250 Installation Amplifier
Dedicated active subwoofer amplifier in a slim 1U rack-mount chassis, delivering up to 250 watts into 4 ohms for Monitor Audio IWS-10 in-wall subwoofer systems and other suitable passive subwoofer loads.
The IWA-250 is not a general-purpose hi-fi amp. It is clearly built as a proper installation amplifier for hidden-bass systems, and it makes the most sense when the brief is discreet low-end support without relying on a visible powered subwoofer cabinet in the room.
Monitor Audio says a single unit can power single or dual IWS-10s, which gives it a very specific role in architectural bass systems where the subwoofer is installed into the structure rather than sitting on the floor.
Built for Hidden-Bass Systems
A sensible option when the room needs proper low-end support but the hardware needs to stay out of sight
The IWA-250 is designed to work with hidden-bass systems and makes particular sense alongside the IWS-10 in-wall subwoofer.
That makes it a smart fit for media rooms, discreet home cinema systems, and custom-install projects where visible hardware is the problem, not the need for bass.
250 Watts into 4 Ohms
Proper subwoofer amplifier power in a slim rack format
The IWA-250 delivers 250 W amplifier output at less than 1% THD+N and supports 4 – 8 ohm loads.
That is exactly what you want from a product like this. It has enough output to make sense with single or dual in-wall subwoofer duties, while still staying compact enough for structured AV rack installation.
Purpose-Built Active Subwoofer Control
Useful tuning features without overcomplicating the job
The IWA-250 is an active sub-woofer amplifier with a 25 Hz lower frequency limit and variable 40 – 120 Hz upper frequency limit at 24 dB/Octave. It also includes EQ presets for Music, Movie, and Impact, plus phase control at 0 and 180 degrees.
That makes it commercially useful because it gives the installer or end user some meaningful low-frequency tuning without turning the product into a complicated processor.
Rack-Friendly and Easy to Integrate
Clean fitment for structured AV systems
The IWA-250 is housed in a heavy-duty 1U rack mount case and measures 43.7 x 432 x 263 mm. It includes LFE in via stereo RCA and balanced inputs, 12v trigger in, and left and right speaker output connections.
That gives it a very practical place in an AV rack. It is small, tidy, and clearly intended to disappear into the equipment stack while doing one job properly.
Useful Auto-Sensing and Power Behaviour
Sensible custom-install details that help the system behave properly
The IWA-250 includes auto sensing at line level greater than 3.5 mV and goes to standby after approximately 15 minutes if no signal is sensed.
It also keeps standby power consumption below 0.5 W, with typical idle below 10 W and max rated power consumption of 200 W.
Specifications
| Specification | Details |
|---|---|
| Brand | Monitor Audio |
| Model | IWA-250 |
| Product Type | Installation Amplifier |
| System Format | Active sub-woofer amplifier |
| Lower Frequency Limit | 25 Hz |
| Upper Frequency Limit | Variable 40 – 120 Hz @ 24 dB/Octave |
| Amplifier Output | 250 W @ < 1% THD+N |
| Supported Load | 4 – 8 ohms |
| Amplifier Classification | Class D amplifier with Switch mode power supply (SMPSU) |
| Cabinet Support | For use when using the dedicated back box |
| EQ | Music / Movie / Impact |
| Phase Control | 0 & 180 degrees |
| Auto Sensing | Line Level > 3.5mV |
| Input Level Behaviour | 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) |
| Dimensions (H x W x D) | 43.7 x 432 x 263 mm |
| Connection | LFE in (Stereo RCA and Balanced), 12v Trigger in (3.5 mm mono mini-jack), left and right speaker output |
| Trigger Input | 5 - 12v via 3.5 mm mono mini-jack socket |
| Power Consumption | Standby: < 0.5 W, Typical Idle: < 10 W, Max Rated: 200 W |
| Weight (unpacked) | 4 kg |
| Sold As | Single Unit |
| Warranty | 5 years |
Detailed Technical Specifications
For those who like to drag out all the useful bits
View full technical specifications
Core Design
- Installation amplifier
- Active sub-woofer amplifier
- Heavy-duty 1U rack mount case
- Designed to power single or dual IWS-10s
- 5-year warranty
Amplifier and Output
- 250 W amplifier output at < 1% THD+N
- Supports 4 – 8 ohm loads
- Class D amplifier
- Switch mode power supply (SMPSU)
Bass Management and Control
- Lower frequency limit: 25 Hz
- Upper frequency limit: variable 40 – 120 Hz @ 24 dB/Octave
- EQ presets:
- Music
- Movie
- Impact
- Phase control:
- 0 degrees
- 180 degrees
Sensing and Input Behaviour
- Auto sensing at line level > 3.5 mV
- Standby after approximately 15 minutes with no signal sensed
- Input impedance: > 20K ohms
Connections
- LFE in:
- Stereo RCA
- Balanced
- 12v trigger in (3.5 mm mono mini-jack)
- Left and right speaker output
- Trigger input: 5 – 12v via 3.5 mm mono mini-jack socket
Power and Chassis
- Mains voltage:
- AC 110 - 120 V ~ 50/60Hz
- AC 220 - 240 V ~ 50/60Hz
- Power consumption:
- Standby: < 0.5 W
- Typical idle: < 10 W
- Max rated: 200 W
- Dimensions: 43.7 x 432 x 263 mm
- Weight: 4 kg unpacked
The Audio Experts Take
The IWA-250 makes a lot of sense when the brief is hidden bass rather than a visible powered subwoofer sitting in the room. The 1U rack format, 250-watt output, active crossover control, and clear pairing with the IWS-10 all point to a product that is built to solve a very specific custom-install problem properly.
What we like here is that it looks commercially honest. It is not trying to be a feature-stuffed AV processor or a flashy hi-fi amplifier. It is a straightforward installation subwoofer amp for architectural bass systems, and that is exactly why it makes sense.
Brand new. Contact us for current availability, IWS-10 pairing advice, and system matching guidance.
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