# Monitor Audio IA125-4 Four Channel 250W Installation Amplifier

The Monitor Audio IA125-4 is a high-performance, ultra-compact 4-channel amplifier designed for custom installation projects where space is limited, but power and flexibility are essential. Ideal for driving in-ceiling, in-wall, or bookshelf speakers in residential or light commercial setups, it’s the perfect solution for installers seeking a reliable and efficient amplification system.

With its half-rack width design and versatile mounting options, the IA125-4 fits neatly into tight spaces, AV racks, or hidden locations. Despite its compact size, it delivers powerful Class D amplification, DSP configuration, and even IP control for seamless integration into wider systems—making it an excellent fit for smart home environments.

**FEATURES**

-   **Compact Half-Rack Design**: Saves valuable space in AV racks and cabinets, perfect for tight installations.
-   **Powerful Class D Amplification**: Delivers 4 x 125W at 4 ohms, ensuring dynamic and clean audio performance across multiple zones.
-   **Versatile Configuration Options**: Offers bridgeable outputs and DSP presets to match speaker requirements and room acoustics.
-   **Ethernet Control and Monitoring**: Integrates easily into smart systems with IP control and web-based UI for remote configuration and diagnostics.
-   **Energy Efficient with Auto Standby**: Reduces power consumption when not in use, meeting eco-conscious installation demands.
-   **Rack-Mountable with Optional Accessories**: Can be paired with Monitor Audio’s rack mount kit for tidy professional installations.
-   **Ideal for Multi-Room Audio**: Designed to drive multiple zones with independent channel control for tailored sound experiences throughout the home.
-   **Silent Fanless Operation**: Ensures quiet performance, suitable for use in living spaces or noise-sensitive environments.
-   **Thermal and Overload Protection**: Built-in safety features extend the life of both the amplifier and connected speakers.
-   **Compatible with Monitor Audio Systems**: Optimised for use with Monitor Audio architectural speakers for consistent performance and tone.

###### What You Get

-   1 x Amplifier Unit
-   1 x Mains Power Lead
-   1 x Connectors Set
-   4 x Adhesive Feet

###### Specifications

-   **Channels:** 4
-   **Output Power @ 4 Ohms/8 Ohms:** 4 x 125W SE\*
-   **Output Power @ 70/100V:** 2 x 250W BTL\*\*
-   **Poweshare (up to):** 2 x 250 W
-   **Power Consumption:** 150 W
-   **Thermal Output:** 512 BTU
-   **Polarity (Default):** Non-inverting
-   **Dimensions:** 44 x 220 x 325 mm (13/4 x 811/16 x 115/8)
-   **Output Voltage:** 70Vp / 140Vpp (SE unloaded), 140Vp / 280Vpp (BTL unloaded)
-   **Signal to Noise Ratio:** >106dB (A-weighted, 20 Hz – 20 kHz, 8 Ohm load)
-   **THD+N (typical):** <0.05% (20 Hz – 20 kHz, 8 Ohm load, 3dB below rated power)
-   **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
-   **Standby Consumption:** <0.5 W
-   **Accessories:** Rack Mount Kit, Wall/desktop mount kit (sold separately)
-   **Power Ratings:** 1% THD @ 120Vac and 230Vac
-   **Cabinet Finish:** Black Anodised
-   **Warranty:** 5 years

## Details

- **Price:** 1650.0 GBP
- **Vendor:** Monitor Audio
- **Type:** Amplifiers
- **Tags:** BLACK5, dfw_feed_exclude

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 1650.00 GBP | In stock |

## Images

- Monitor Audio IA125-4 Four Channel 250W Installation Amplifier - K&B Audio
- Monitor Audio IA125-4 Four Channel 250W Installation Amplifier - K&B Audio
- Monitor Audio IA125-4 Four Channel 250W Installation Amplifier - K&B Audio

---

> Source: [K&B Audio](www.kbaudio.co.uk/products/monitor-audio-ia125-4-four-channel-250w-installation-amplifier)
> Updated: 2026-04-29