Quantum Line Source / QLS-1

ntroduced: 1976
Dimensions:  167 x 38 x 45 cm
Bass: 1 x 30 cm
Mids: 1 x Midbass coupler, 6 x 3,8 cm soft domes
Highs: 9 x EMIT (one on the back)
Suggested for amplifiers with: 100-500 Watts per channel
Frequency range: 18 Hz - 32 kHz
Crossover frequencies: 200 Hz, 600 Hz, 4000 Hz
Suggested price (pair):  2600 $

Comment: There are QLS-1 where the midbass coupler is nearer the woofer, maybe a newer revision.

A technical sheet with crossover schematics can be seen here.
Another crossover schematics: page 1, page 2

Get the manual here: page 1, page 2, page 3, page 4, page 5, page 6, page 7
Another manual: page 1, page 2, page 3

Click here for a review of the QLS-1 from Stereo magazine 1977: page 1, page 2
And view a brochure here: page 1, page 2, page 3, page 4, page 5, page 6, page 7, page 8, page 9