I55

Audio Research I/55 – Tube Integrated Amplifier, Essential Approach

At Son Ultime, the Audio Research I/55 represents the very essence of tube amplification: a simplified architecture, focused on musicality, allowing access to the Audio Research signature in a more direct and accessible configuration.

Designed as a more compact and streamlined version of the I/70, the I/55 prioritizes coherence, fluidity, and ease of integration, while retaining the fundamentals that define the Audio Research approach.

A Simplified Approach to Tube Amplification

The I/55 adopts a deliberately more direct architecture, reducing complexity to favor musicality and stability.

• Optimized tube architecture
• Class AB operation
• KT88 output tubes
• Simplified signal path
• Compact integration

This approach results in a natural and fluid sound reproduction, particularly suited to coherent and well-balanced systems.

Observed Sonic Behavior at Son Ultime

In our systems, the I/55 stands out for an engaging musical presentation, with an emphasis on coherence and fluidity.

• Warm and natural harmonic texture
• Stable and well-structured soundstage
• Controlled bass in appropriate configurations
• Excellent musicality at moderate volume
• Very low listening fatigue

It is a particularly interesting solution for systems where musicality takes precedence over brute power.

Comparison with the Audio Research I/70

The I/55 and I/70 share a common philosophy but address different needs.

The I/55 should be seen as a more direct and accessible version, while the I/70 is aimed at more ambitious systems requiring greater control and dynamic headroom.

Technical Specifications

System Integration According to the Son Ultime Approach

The I/55 performs particularly well in coherent systems that are well-matched to its power output.

• HifiRose Digital Sources
• MSB Technology DAC (Discrete)
• Suitable Bowers & Wilkins Speakers
• Acora Acoustics Speakers
• REL Acoustics Subwoofers for Bass Extension
• Shunyata Research Cabling and Power Supply
• Silent Angel Network Infrastructure

Speaker selection and the listening environment are key factors to fully exploit its capabilities.

Son Ultime Approach

At Son Ultime, the I/55 is used as a coherent solution to build a musical and balanced system.

We analyze:

• Speaker efficiency and load
• Room size
• System structure
• Electrical power supply

This approach allows the I/55 to be optimally positioned and avoids any limitations related to its format.

Schedule a listening session at Son Ultime to compare the I/55 and I/70 and determine the most suitable configuration for your system.