ARCAM's Cambridge Heritage Meets Modern Innovation
Building on nearly 50 years of audio expertise from Cambridge, ARCAM's updated Radia+ amplifiers represent the natural evolution of their celebrated integrated amplifier range. Each model incorporates meaningful upgrades that address real-world listening needs whilst preserving the musical character that made the original Radia series so successful.
These aren't minor tweaks – ARCAM's engineers have redesigned key circuits, upgraded transformers and implemented intelligent power management throughout the range. The result? Cleaner sound, better connectivity and enhanced reliability across all three models.
Advanced Wireless Technology
Every Radia+ amplifier features ARCAM's latest Bluetooth 5.4 implementation with Snapdragon Sound technology. AptX Lossless codec support ensures wireless streaming maintains full CD-quality resolution, whilst Auracast compatibility enables seamless multi-device connections without traditional pairing hassles.
For many customers, this wireless upgrade alone justifies the move to the new series. The sound quality difference compared to standard Bluetooth is immediately obvious – detailed, dynamic and genuinely hi-fi.
Model Specifications and Features
A5+ Integrated Amplifier - £749
Power Output: 2 x 50W Class AB
Phono Input: MM (moving magnet) with enhanced circuit design
Digital Inputs: Optical, coaxial, USB
Analogue Inputs: 3 line inputs plus phono
Wireless: Bluetooth 5.4 with AptX Lossless, Auracast
Dimensions: 433 x 87 x 315mm
The A5+ makes high-end audio accessible without compromise. Its refined phono stage handles vinyl playback beautifully, whilst the comprehensive input selection accommodates modern and traditional sources equally well. Perfect for bookshelf speakers in rooms up to medium size.
A15+ Integrated Amplifier - £1,199
Power Output: 2 x 80W Class AB
HDMI: eARC connection for TV integration
Digital Inputs: Optical, coaxial, USB, HDMI eARC
Analogue Inputs: 3 line inputs plus phono
Wireless: Bluetooth 5.4 with AptX Lossless, Auracast
Transformer: Enhanced design with reduced chassis interference
The A15+ adds significant power and HDMI eARC connectivity, making it ideal for combined music and TV systems. The upgraded transformer delivers noticeably cleaner power, benefiting both music reproduction and overall system stability.
A25+ Integrated Amplifier - £1,699
Power Output: 2 x 100W Class G (high-efficiency design)
DAC: Dedicated ESS9018 for SPDIF inputs
Digital Inputs: Optical, coaxial, USB-C, HDMI eARC
Analogue Inputs: 3 line inputs plus phono
Display: OLED behind precision-cut glass panel
Power Supply: Dedicated transformer windings for digital circuits
The flagship A25+ incorporates the most comprehensive upgrades. Class G amplification provides exceptional efficiency and power, whilst the separate DAC ensures optimal digital source handling. The glass front panel and OLED display create visual harmony with ARCAM's ST25 streamer.
Engineering Improvements That Matter
ARCAM's intelligent power management represents a genuine breakthrough in integrated amplifier design. Unused circuits power down automatically – the DAC shuts off during analogue playback, wireless modules disable when not required, and trigger inputs power down without connections.
This selective shutdown dramatically reduces the noise floor, allowing musical details to emerge that were previously masked. The effect is particularly noticeable during quiet passages, where subtle instrumental textures become clearly audible.
The transformer upgrades in the A15+ and A25+ address power supply quality at its source. Reduced chassis currents and improved regulation create a stable foundation for the sensitive amplification circuits. Music sounds more controlled and dynamic as a result.
Real-World Performance Benefits
The sonic improvements are immediately apparent. Bass response becomes tighter and more controlled, midrange clarity improves noticeably, and high frequencies extend cleanly without harshness. These aren't subtle changes – most listeners identify the differences within the first few minutes of listening.
Vinyl enthusiasts will particularly appreciate the phono stage refinements. Complex orchestral pieces track more accurately, whilst the improved signal-to-noise ratio reveals low-level details previously lost in the background.
Digital sources benefit equally from the circuit improvements. CD playback gains authority and presence, whilst high-resolution files through USB inputs sound remarkably natural and unprocessed.
Choosing Your Radia+ Amplifier
Room size and speaker requirements largely determine which model suits your needs. The A5+ handles most bookshelf speakers beautifully and works well in smaller to medium spaces. Its 50W output provides ample headroom for domestic listening levels.
The A15+ extends the power envelope to 80W, making it suitable for larger rooms and more demanding speakers. The HDMI eARC connection simplifies TV audio integration, eliminating the need for additional cables or switching.
The A25+ represents the ultimate Radia+ experience. Its 100W Class G output drives virtually any domestic speaker with ease, whilst the enhanced DAC and power supply deliver reference-quality performance from digital sources.
Why Choose Martins Hi-Fi for Your ARCAM Purchase
We've been selling ARCAM amplifiers for decades and understand their strengths intimately. Our Norwich shop stocks all three Radia+ models, allowing direct comparison in a proper listening environment.
More importantly, we'll match each amplifier with suitable speakers and sources for your specific setup. There's no substitute for hearing these differences yourself, and we'll take the time needed to ensure you make the right choice.
Our relationship with ARCAM means we stay current with product developments and can provide expert setup advice. We also handle warranty support locally, giving you peace of mind with your investment.
Technical Support and Setup
Each Radia+ amplifier includes comprehensive setup options and customisation features. We'll configure your chosen model to match your speakers and room acoustics, ensuring optimal performance from day one.
Our team provides ongoing technical support throughout ownership. Whether you're adding new sources or upgrading speakers, we're here to help maximise your system's potential.
Availability and Demonstration
All three ARCAM Radia+ models are available for immediate demonstration at our Norwich shop. We recommend booking a listening session to ensure unhurried evaluation time.
Contact us to arrange your demonstration or discuss which Radia+ model best matches your requirements and budget.
ARCAM Radia+ Series - Technical Summary
| Model | Power | Price | Key Features |
|---|---|---|---|
| A5+ | 2x50W | £749 | MM phono, Bluetooth 5.4, multiple inputs |
| A15+ | 2x80W | £1,199 | HDMI eARC, enhanced transformer, all A5+ features |
| A25+ | 2x100W | £1,699 | Class G power, dedicated DAC, glass panel, all A15+ features |
Contact Martins Hi-Fi Norwich for demonstration appointments and expert advice on ARCAM Radia+ integrated amplifiers.
