Acoustic Research AR-5 [early release, AlNiCo], 1969-1971, made in USA

Link: vintage-speaker-review | hifiengine | humanspeakers | ldsound

Drive units: 254mm (10in) acoustic suspension woofer, 38 mm (1,5 in) midrange hemispherical dome, 19 mm (3/4in) high-frequency hemispherical dome

Crossover: 650 Hz, 5000 Hz

Impedance: 8 ohms nominal

Controls: Midrange and high-frequency driver level controls

Amplifier: Up to 100 watts per channel

Size: 343 x 610 x 292 mm deep (13,5 x 24 x 11,5 in)

Weight: 17,8 kg (39lb)

Wooer resonance: Free air 26 Hz, in enclosure 56 Hz

Volume of enclosure: 38,2 liters (1.35 cu ft.)