Altec Lansing 605B User Manual
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COAXIAL MONITOR LOUDSPEAKER
ALTEC 'Duplex' Loudspeakers are two-way transducers, consisting of independent high- and low-frequency
units, mounted within one physical frame, to provide the quality advantages of a professional two-way
speaker system in compact form.
The efficiency, power handling capacity, and extremely wide response of these units make them an ideal
choice for both single-source (high-level) and distributed (low-level) sound systems. The 605B provides
minimal distortion, wide range, smooth response, and excellent distribution characteristics to assure perfect
audio reproduction of speech and music for all PA, sound reinforcement, or background music installations
and for high-quality monitoring of broadcast and recording material.
Each 605B 'Duplex' Loudspeaker is supplied with a professional-type, full-section dividing network,
incorporating a high-frequency balance control for correctly matching or adjusting to the acoustical
characteristics of individual listening areas.
The 605B 'Duplex' — one of the finest 15-inch, full-range loudspeakers in use throughout the audio
industry — has, for years, been the accepted standard monitor loudspeaker of major broadcast and recording
studios. The 605B covers the audio range from 20 to 20,000 Hz. The exceptional uniformity of response
is due, in part, to the large, edge-wound voice coils (aluminum in the high-frequency section and copper in
the low-frequency section), operating in magnetic gaps of high flux density, produced by independent
oversize Alnico V magnets. The large 2%" aluminum high-frequency diaphragm has tangential compliance,
and is coupled to a heavy, high-impact, compression-molded multicellular horn. It provides outstanding
sound distribution and clarity of the higher musical harmonics — without annoying resonant 'peaks' or
'hollows' which produce undesirable sound cancellation. A combination of phasing plug and pole piece,
precision-machined with two acoustically exponential annular slots, assures correct phase relationship
between the center and outer edge of the HF diaphragm. The high-compliance low-frequency cone, driven
by the large 3" copper voice coil, reproduces the lowest fundamental bass tones without frequency doubl
ing of 'bottoming' — even at full rated power.
1515 S. Manchester Ave., Anaheim, Calif. 92803
A DIVISION OF ALTEC CORPORATION