Audio Research LS28 Line Stage Pre Amplifier Ex-Demo Wellington

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The LS28 line stage is a flexible and intuitive pre amplifier. Four balanced and four single-ended inputs, and two sets of both balanced and single-ended outputs, allow maximum connectivity.

The straightforward menu allows control of numerous parameters, including input naming, tube hours, auto shutdown, and home theater pass through. Phase invert and mono are also standard functions. At the heart of the LS28 are four 6H30 vacuum tubes in the analog circuit. While the LS28 is the perfect match for any Audio Research amplifier, it has been designed to work with nearly any amplifier on the market today.

Audio Research LS28 Line Stage Pre Amplifier

The Foundation Series continues this passion and philosophy, offering the listener stunning playback, great value, and unparalleled long-term support.

Audio Research is one of the oldest continually operating manufacturers in American audio. The company was founded in 1970 in Minneapolis with one goal in mind: to advance the state-of-the-art in music reproduction. Today, Audio Research remains a performance-oriented company by philosophy and design. New product introductions are driven only by genuine advances in technology and performance. The company has grown steadily over the last 40 years, with a network of top audio specialist retailers across North America and distributors throughout Europe, Asia and South America. The company occupies a 48,000 square-foot, technically-advanced production plant and administrative headquarters in Plymouth, Minnesota, where approximately 50 technical, assembly and support staff guide the product line from concept to finished goods.

  • FREQUENCY RESPONSE +0-3dB, 0.4Hz to 200kHz at rated output
  • (Balanced, 200k ohms load)
  • THD+NOISE Less than .007% at 2V RMS BAL output.
  • NOISE Less than -100dBv at max volume (103).
  • DYNAMIC RANGE 122dB (AES17).
  • CROSSTALK -105dB
  • GAIN Main output: 18.7dB balanced output. (9.3dB SE output.)
  • Record output: 0dB (Processor input: 0dB balanced out).
  • INPUT IMPEDANCE 100K ohms Balanced, 50K ohms
  • SE. 8 Inputs - 4 balanced, 4 single-ended.
  • Balanced, 300 ohms SE Main (2), 20K ohms minimum load and 2000pF maximum capacitance.
  • Outputs (3): 2 Main, 1 Record (XLR and RCA connectors).
  • OUTPUT POLARITY Non-inverting.
  • RATED OUTPUTS 2V RMS (1V RMS SE) 1Hz to 200kHz into 200K ohm balanced load (maximum balanced output capability is 17V RMS at less than 0.5% THD at 1kHz).
  • CONTROLS Rotary volume selector (103 steps) and rotary input selector.
  • Push buttons: Power, Menu, Enter, Mono, Invert, Mute
  • POWER SUPPLIES Electronically regulated low and high voltage supplies.
  • Automatic 45 sec. warm-up/brown-out mute.
  • Line regulation better than .01%.
  • TUBE COMPLEMENT (4) 6H30P dual triode.
  • POWER REQUIREMENTS 200-250VAC 50/60Hz) 130 watts maximum.
Audio Research DAC9 Tube DAC

Here’s the bottom line, and I’m giving the punch line away early in the review. After living with the Foundation series for a few months now, they all deliver top of class performance, and each offers exceptional value, judged alone. more...

Due to the bespoke nature of our high-end music systems this product is not available to be purchased online. Please contact us for personalized service from one of our team of experts.