I/55 vs VSi75
The VSi75's power @ 8ω is 75W against the I/55's 50W, its thd 1.500% against 1.000%, its input impedance 52.5Ω against 100Ω, and its input sensitivity 0.6V RMS against 1.3V RMS.
AI-generated product photo — not official manufacturer imagery.
AmplifiersTube AmplifiersIntegrated Amplifiers
Estimated price (community-sourced)
$6,950
Around — community and catalog average, updates slowly
About the I/55
The Audio Research I/55 integrated amplifier combines a fully tube-based design with modern functionality, using two matched pairs of 6550WE output tubes and three 6922 tubes (one input, two driver) for renowned power and grace in a compact chassis. It features an independent active tube preamplifier section for wider gain range, higher headroom, stronger dynamics, and improved loudspeaker control compared to the I/50. Includes stereo preamp/subwoofer outputs, headphone jack driven by 6550 tubes, auto-bias for output tubes, LexieTubes display for input/volume, and optional DAC card (AKM Velvet Sound chip supporting USB, optical, coax, Bluetooth with upsampling) or MM/MC phono card (adjustable MC loading 50-1k ohms). Inputs: 4 balanced XLR, 4 single-ended RCA. Currently manufactured as part of Audio Research's restructured product line.
Specifications
Power Specifications
Amplification power output and characteristics
- Power @ 8Ω
- 50W @ 8Ω
- Amplifier Class
- AB
- Input Sensitivity
- 1.3V RMS
- Input Impedance
- 100Ω
- Max Input Voltage
- 3.5V RMS
Analog Output
Analog signal output specifications
- THD
- 1.000%
Connectivity
Input and output connections
- Bluetooth
- Yes
- Wi-Fi
- No
- Ethernet
- No
- Digital Inputs
- USB, Optical, Coax
- Analog Inputs
- RCA, XLR
- Analog Outputs
- RCA
Physical Dimensions
Size, weight, and appearance
- Dimensions
- 420 × 180 × 340 mm (W × H × D)
- Weight
- 18.1 kg (40 lbs)
Key Specifications
Power: 50W
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions