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Monitor Audio IA1254
Streamers and Amplifiers Collection


  • 4 x 125 W/2 x 250 W
  • Fully customisable DSP amplifier with web configurator
  • Half width 1U rack format allows unique installation opportunities or high power density depending on how the product is mounted

Quick Specs

  • Type: Amplifier
  • Energy Star Rated: No

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by Monitor Audio

Our music streamer and amplifiers are designed to bring superior sound to any project. They are quick and easy to fit and their discreet form ensures they use the minimum amount of space.

Each of the amplifiers has been engineered to give a stunning performance. With a choice of sizes, inputs, outputs and power options, there is a Monitor Audio amplifier for every situation.

The IMS-4 music streamer is the perfect partner for our amplifiers; using BluOS™ technology it can play digital music in up to four separate zones.

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This compact, ultra-high power density DSP amplifier delivers four channels of 125 W or two channels of 250 W. All from a convenient 1U half-size design.

The IA125-4 is a deceptively powerful amplifier that packs ultra-high-density amplification into its compact 1U half-rack form. It delivers 4-channels of 125 W or 2-channels of 250 W. Plus, it can be used in power sharing mode to support Monitor Audio s THX Ultra certified, Cinergy 100 speakers within a home theatre system or medium sized garden. It s the ideal amplifier for two zone stereo applications and height channels within home theatre systems.

Note: Rack and wall/desk installation kits sold separately.

18/03/24 - Download firmware V1.6.2 from this link . This has a number of bug fixes and feature improvements. For a full list of these and instructions on what to do, please download our guide from this link .


  • 4 x 125 W/2 x 250 W
  • Fully customisable DSP amplifier with web configurator
  • Half width 1U rack format allows unique installation opportunities or high power density depending on how the product is mounted
Channels 4
Output Power @ 4 Ohms/8 Ohms 4 x 125W SE
Output Power @ 70/100V 2 x 250 BTL
Poweshare (up to) 2 x 250 W
Power Consumption 150 W
Thermal Output 512 BTU
Polarity (Default) Non-inverting
Dimensions Dimensions 44 x 220 x 325 mm (1 3/4 x 8 11/16 x 11 5/8 ")
Output Voltage 70Vp / 140Vpp (SE unloaded), 140Vp / 280 Vpp (BTL unloaded)
Signal to Noise Ratio >106dB (A-weighted, 20 Hz - 20 kHz, 8 Ohm load)
Frequency Response +0/-0.25dB 20Hz - 20kHz (8 Ohm load, 3dB below rated power)
Protection Circuits Short circuit -, DC, Undervoltage -, Temperature - and Overload protection
Power Supply Switch mode power supply with Power Factor Correction (PFC) and standby converter
Operating Voltage/Frequency Universal Mains, 100 V - 240 V, 50 Hz - 60 Hz
Accessories Rack Mount Kit, Wall/desktop mount kit (sold seperatley)
Power Ratings 1% THD @ 120Vac and 230Vac
Cabinet Finish Black Anodised
* SE - Single Ended * SE - Single Ended
** BTL - Bridge Tied Load ** BTL - Bridge Tied Load
*** BTU - British Thermal Unit *** BTU - British Thermal Unit

Quick Specs

  • Appearance

  • Type: Amplifier

  • Features

  • Energy Star Rated: No

Professional delivery and installation is available for every product we sell. We would be happy to coordinate delivery and installation for you.

Extended warranties are usually very inexpensive and can save you thousands in the future. It's simple and inexpensive to purchase extended warranties and one of the smartest ways to protect your investment.

Electronics can be large, heavy and expensive. You probably don't have the special tools or expertise needed to fix them in a crisis. If you can spare a few thousand dollars without batting an eyelash for new electronics should they break tomorrow, don't buy a warranty. But if you're like most of us, protect yourself by purchasing inexpensive extended warranties when you buy a new product and save yourself big money in the long run.