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Description: Two-way, rear-ported, stand-mounted loudspeaker. Drive-units: 0.5" by 1.75" (12 by 45mm) True Ribbon tweeter, 4.9" (125mm) woofer with woven Kevlar cone. Crossover frequency: 3kHz. Frequency response: 48Hz–22kHz, ±3dB. Bass extension: 37Hz, –6dB. Sensitivity: 87dB/2.83V/m. Impedance: 8 ohms nominal, 4.5 ohms minimum. Peak SPL: 98dB. Recommended amplification: 25–150W.
Dimensions: 13" (330mm) H by 7.1" (180mm) W by 10.25" (260mm) D. Weight: 13.5 lbs (6.1kg).
Finishes: Black Oak, Sapele Mahogany, Piano White or Black.
Serial numbers of…
Analog Sources: Kuzma Stabi S & Stogi S turntable & tonearm; Music Hall MMF-7.3 turntable; Denon DL-103, Goldring Elite MC, Ortofon 2M Bronze cartridges.
Digital Sources: Apple MacBook computer running Audirvana Plus; Ayre Acoustics QB-9DSD, PS Audio NuWave, Mytek HiFi Manhattan DACs; LG BD-550 BD player; Western Digital T2 Mirror Drives (2).
Preamplification: Auditorium 23 A23 moving-coil step-up transformer, Heed Audio Quasar phono stage, Shindo Laboratory Allegro preamplifier.
Power Amplifier: Shindo Laboratory Haut-Brion.
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I used DRA Labs' MLSSA system and a calibrated DPA 4006 microphone to measure the Quad S-2's frequency response in the farfield, and an Earthworks QTC-40 for the nearfield responses. My estimate of the Quad's sensitivity was 86.9dB(B)/2.83V/m, confirming the specified figure of 87dB. Fig.1 shows how the impedance and electrical phase vary with frequency. Though the impedance has a minimum value of 4.17 ohms at 190Hz and there's a combination of 5.8 ohms and –37° phase angle at 117Hz, the S-2 is a relatively easy load for amplifiers to drive.
The traces in…
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For a long time there, it seemed like anyone who walked into a good hi-fi shop and used the word "rock" and/or "bass" had a better-than-even…