Audio Research I/55

8290 €

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The I/55 takes advantages of new features and advancements from the I/70 to create a worthy successor to the I/50. I/55 imports all of the functionality of the I/70 into a chassis that maintains the look and power output of the I/50.

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/55 and be surprised by its depth of bass and dynamic expression. Two LexieTubes® provide display information for input selection and volume.

Chief among the improvements from I/50 to I/55 is the addition of auto-bias. This keeps the output tubes in their optimal operating range for the life of the tubes.

The I/55 integrated amp has independent tube preamplifier and tube amplifier sections, providing flexibility with a set of stereo preamplifier outputs. While we suspect very few listeners will pair it with an external power amp, many will need this feature to feed powered subwoofers that offer only low-level inputs.

The active preamplifier also offers a much wider range of gain setting compared to the passive preamp on board the I/50. This is especially helpful with recordings that are cut at a low gain setting for wide dynamic range. Despite its identical power rating to the I/50, the I/55 will offer additional output due to both additional gain and higher headroom in its preamplifier section.

The headphone output is driven by the 6550 output tubes. It was designed for high quality headphones, able to provide the best possible personal listening experience.

The DAC card’s AKM Velvet Sound DAC chip provides high resolution formats over USB, Optical, Coax, and Bluetooth. All are upsampled. The result is fine resolution, great transparency, and tonal purity that is rarely heard outside of the finest separate DACs.

There are three sets of single-ended inputs and one set of Balanced XLR inputs. The optional phono card has both MC and MM gain settings, controlled via the I/55 remote. MC loading is also adjustable, from 50 to 1k ohms.

SPECIFICATIONS

Type / Topology	Tube integrated amplifier · push-pull design (Class A/AB)
Power output	2 × 55 W continuous into 8 Ω / 4 Ω (20 Hz–20 kHz)
Power bandwidth	~10 Hz – 22 kHz (-3 dB)
Frequency response (-3 dB)	~7 Hz – 30 kHz
THD	< 1% at rated power · < 0.1% at 1 W
Input sensitivity	~1.25 V RMS for rated output
Input impedance	~48 kΩ (SE)
Inputs	3 × RCA single-ended
Optional modules	Optional DAC module (USB, coax, optical, Bluetooth)
Outputs	Speaker outputs (4 Ω / 8 Ω taps)
Headphone output	Yes (front panel)
Tube complement	2 matched pairs KT88 output tubes · 3 × 6922 driver/input tubes
Biasing	Automatic bias
Display	LED / front panel status indicators
Remote control	Included
Power requirements	105–130 VAC / 210–250 VAC
Power consumption	~300 W max
Dimensions (W × H × D)	420 × 180 × 340 mm
Net weight	~18 kg