LS7

About the LS7

The Audio Research LS-7 is a tube-based stereo line preamplifier introduced around 1994-1995, featuring four 6922/E88cc dual triode tubes. It offers a frequency response from 1Hz to 100kHz with less than 0.01% total harmonic distortion at 2V RMS output, and a gain of 13dB on the main output. The preamplifier is designed with electronically-regulated low and high voltage supplies, ensuring line regulation better than 0.01%. It includes five inputs (tape, tuner, CD, video, aux) and outputs for tape and main line, with recommended load impedance of 60K ohms. The LS-7 is praised for its dynamic bass, detailed midrange and treble, and a spacious 3D soundstage that places instruments and vocals with clarity and rhythm. It is a straightforward, no-frills unit with only input selection and volume controls, and a sleek minimalist design. The unit weighs approximately 9.8 lbs (4.5 kg) net and measures 19" W x 5.25" H x 10.25" D. It requires 25 watts of power and supports 100-135VAC 60Hz or 200-270VAC 50/60Hz operation. The LS-7 is highly regarded as an affordable yet high-quality tube preamplifier that delivers soulful and musical sound reproduction, suitable for audiophiles seeking natural and engaging audio performance.