Reference Standard 4 (B)
Introduced: 1982 (?)
Dimensions: 108 x 37 x 28 cm
Bass: 2 x 20 cm
Mids: 1 x Polydome
Highs: 1 x EMIT
Suggested for amplifiers with: 40-150 Watts per channel
Frequency range: 40 Hz - 32 kHz
Crossover frequencies: 600 Hz, 4000 Hz
Suggested price (pair): 897 $
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A technical sheet with crossover schematics of the RS 4 can be seen here.