The Quad ESL-57 (1957-1985) is one of the most influential speaker designs in audio history: full-range electrostatic, ~80 dB efficiency, narrow dispersion, legendary mid-range clarity. Demands a small room and a high-quality low-power amplifier. Not for every system but a transformative experience when matched correctly.
Pricing in 2026 for a serviced pair: EUR 1500-3500.
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The treble panels degrade over time and replacement panels (from Quad Musikwiedergabe or One Thing Audio) are EUR 700-1200 per pair. Buying unserviced means budgeting a near-certain panel refurbish.
Listen at low volume only during inspection - the originals can arc and fail if pushed hard. Verify all four panels per speaker are present and uncrumpled.