Acoustic Research Model 218V 

Method    2-way, 2-speaker, acoustic suspension system
Bookshelf Type / Magnetic Protection Design
Units Used    For low band : 16 cm cone type
For high-pass : 1.9 cm dome type
Frequency characteristic    55 Hz to 20 kHz ± 3 dB
Output sound pressure level    86dB/2.83V/m
Impedance    8 Ω
Allowable input    150W maximum
Crossover frequency    3.5kHz
External dimensions    Width 210x Height 330x Depth 210 mm
Weight    5.5kg