Audio Research I/50 Integrated Amplifier

I/50 combines sublime performance and simplicity while accommodating a variety of musical sources in a single elegant package. Hand-crafted in Minnesota, the I/50 is built with the same attention to detail as all other Audio Research products – each one is bench-tested twice and gets its own listening test with sound engineer Warren Gehl. The foundation is an all-tube amplification circuit using two matched sets of 6550 power tubes, fed by 6922 input tubes. The traditional combination of power and grace for which Audio Research is renowned is instantly recognizable even in this compact model. Challenge the I/50 and be surprised by its depth of bass and dynamic expression. Two LexieTubes® provide display information for input selection and volume. Three single-ended inputs and one XLR input provide connectivity for your analog components, along with 4 and 8 Ohm speaker taps to accommodate your speaker of choice. One input can even be assigned for pass-through function. A full-function metal remote control provides further convenience and ease. An optional tube cage is available. Optional DAC and Phono modules round out your ability to include all your favorite recordings and listening styles. The AKM Velvet Sound DAC chip facilitates high resolution formats over USB, Optical, Coax, and even upsampling Bluetooth. Combined with the I/50’s output stage, the result is finely graded resolution, but also authenticity of tone and purity that is rarely heard outside of the finest reference gear. The I/50 has earned high acclaim for its ability to communicate musical intent and flow at a reasonable price and do so with a wide variety of partnering loudspeaker brands. The optional Phono module offers 42dB of gain to support Moving Magnet and a generous array of quality High Output Moving Coil cartridges to help you build a high-performance analog system with I/50 as the heart. The ability of the I/50 to reconstruct a musical experience will thrill and excite all who hear it. The I/50 is a fully integrated product while providing true Audio Research performance and sound quality. TECHNICAL SPECIFICATIONS Power Output 50 watts continuous from 20Hz to 20kHz. 1kHz total harmonic distortion typically 1% per channel, below 0.1% at 1 watt (Note that actual power output is dependent upon both line voltage and “condition” i.e.: if power line has high distortion, maximum power will be affected adversely, although from a listening standpoint this is not critical) Power Bandwidth  (-3dB points) 10Hz to 22kHz Frequency Response  (-3dB points at 1 watt) 7Hz to 30kHz Input Sensitivity 1.25V RMS for rated output Input Impedance 100K ohms Balanced, 48K ohms Single Ended  Output Polarity Non-inverting. Balanced input pin 2+ (IEC-268) Input Impedance 100K ohms Balanced, 50K ohms SE 8 Inputs – 4 balanced, 4 single-ended Output Taps 8 ohms, 4 ohms Power Requirements 105-130VAC 60Hz (210-250VAC 50Hz) 252 watts at rated output Tube Required 2 matched pairs 6550WE; 3 x 6922 (1 input, 2 driver) Dimensions Width 16.5” (42 cm) Height 7.25” (18 cm) Depth 13.5” (34 cm) Weight: 40 lbs (18.1 kg); 51 lbs (23.1kg) shipping weight