Qb

Introduced: 1978
Dimensions:  63,5 x 36,5 x 30,5 cm
Bass: 1 x 25 cm
Mids: 1 x 10 cm
Highs: 1 x EMIT
Suggested for amplifiers with: 15-150 Watts per channel
Frequency range: 42 Hz - 32 kHz
Crossover frequencies: 500 Hz, 4000 Hz
Suggested price (pair):  396 $

Click below for the owners manual.
page1, page 2, page3

You can view a brochure of the Qb here.
page 1, page 2

A technical sheet with crossover schematics can be seen here.