Space-saving 5U design
The compact 5U chassis allows for efficient use of rack space, fitting tighter setups without compromising on power or performance, making it ideal for professional environments.
KEY FEATURES
The ATC R4‑150 Pro is a compact 4‑channel, 5U rack‑mount power amplifier that delivers 150 W continuous output per channel, combines the proven MOSFET Class A/B circuitry of the classic R1‑450 series with a slimmer chassis, balanced XLR inputs and Neutrik NL4 speaker outputs, and adds remote‑trigger power control for modern immersive‑audio installations.
Design and Power Architecture
ATC equips each of the four channels with an independent MOSFET Class A/B amplifier and a dedicated power transformer, which minimises crosstalk and guarantees full‑rated power even when all channels run simultaneously. The chassis measures only 5U, saving two rack units compared with a pair of the earlier P1 Pro units, while fan‑less convection cooling keeps operation silent for control‑room environments.
Input and Output Connectivity
Balanced XLR connectors feed the front‑panel bi‑colour LEDs that display power status and limiter activity, providing instant visual feedback. Speaker‑level signals exit via robust Neutrik NL4 connectors, ensuring secure, low‑impedance connections to loudspeakers.
Signal Integrity and Noise Rejection
ATC’s class‑leading input stage achieves exceptional common‑mode rejection—exceeding a factor of 10 000 across the audio bandwidth—so the amplifier thrives in electrically noisy settings such as machine rooms or multi‑room facilities. Low noise and ultra‑low crosstalk preserve the purity of the source material.
Protection and Remote Operation
Thermal and DC‑offset protection guard each channel against overload, while rear‑mounted remote‑trigger inputs let installers power the unit on or off from a central control system, adding flexibility to complex rigs.
Why Choose the ATC R4‑150 Pro
• Space‑saving 5U footprint – fits tighter racks without sacrificing power
• Four independent 150 W MOSFET channels – delivers clean, headroom‑rich sound
• Balanced XLR inputs + Neutrik NL4 outputs – ensures secure, low‑noise connections
• Fan‑less convection cooling – silent operation for control‑room use
• Remote‑trigger power control – simplifies integration in immersive setups
- 4 × 150 W continuous MOSFET Class A/B channels
- Independent power transformer per channel for ultra‑low crosstalk
- Balanced XLR inputs with exceptional common‑mode rejection (>10 000×)
- Neutrik NL4 speaker‑level outputs for robust connectivity
- 5U rack‑mount chassis, saving 2U versus a pair of P1 Pro units
- Fan‑less convection cooling for silent operation
- Front‑panel bi‑colour LEDs indicating power and limiter status
- Rear‑mounted remote‑trigger on/off inputs for centralized control
- Thermal and DC‑offset protection on each channel
- UK over £99 FREE
- UK under £99 £10
- EU £36
- Rest of World £80
Large/Heavy items: Extra charges may apply (e.g., consoles, large monitors). We’ll contact you before processing if so.
We ship with DPD and UPS across the UK, EU and worldwide. Same-day within the M25 is available depending on stock.
This item, like everything we supply, comes with the complete support of our expert team. Our excellent technicians have been specifying, building and supporting studios for over twenty years. If you have any problems with installation, setup or everyday use, they’re never more than a click away, and always happy to help.
You can contact them here.
KEY BENEFITS
Independent MOSFET channels
Each of the four channels delivers 150 W of clean, headroom-rich sound, ensuring high-quality audio output even when all channels are in use simultaneously.
Silent fan-less operation
The fan-less convection cooling system guarantees silent operation, making it perfect for control-room environments where noise interference must be minimized.