Classic pair of the immortal Quad ESL 63 loudspeaker, fully restored to new by the Quad restorer par excellence Kent McCollum of Electrostatic Solutions, with a matching pair of Gradient SW-63 dipole subwoofers (cones refoamed and restored as well). The speakers and subwoofer come with two custom crossover units, one a Behringer DCX-2496 digital crossover, and an analog aftermarket crossover made by MT Audio Design.
The fully restored and refurbished ESL 63 sounds magnificent to my ears, with a fullness to the sound that is addictive. The matching dipole Gradient subwoofers allows the Quads to excel at what they do, reproducing the range of music above 100 Hz, and frees them of the load of reproducing bass transients. The result is a full range loudspeaker, capable of competing against any loudspeaker on the planet, both in terms of sheer accuracy of response, and low distortion.
Professor Robert Greene, well-known long-term reviewer for The Absolute Sound said in his review of this combination: "The already superb performance of the Quads enhanced and extended by the Gradient subwoofers reaches right up to the highest level of performance available in almost all categories: natural tonal balance, bass definition, midrange clarity, soundstage/imaging, almost everything except brute power and the last top bit of treble extension."