Altec Lansing 605B User Manual
60SB
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.
A DIVISION OF ALTEC CORPORATION
1515 S. Manchester Ave., Anaheim, Calif. 92803
Aim 605В
SPECIFICATIONS
DESCRIPTION
Power;
Frequency Response:
Pressure Sensitivity:
Impedance:
Cone Resonance:
Voice Coil Diameters:
Horizontal
Distribution:
Vertical Distribution;
Magnet Type:
605B
The loudspeaker shall be 15-5/16 inches in diameter and of the 2-way Duplex type, having a con
tinuous power rating of 35 watts and a peak power rating of 50 watts. The loudspeaker shall be
capable of reproducing a frequency range from 20 to 20,000 Hz and from 35 watts shall have a
minimum pressure sensitivity of 112.4 dB SPL at 4 feet, measured on axis. The loudspeaker shall
employ a full-section dividing network having a 1,600 Hz crossover frequency and a continuously
adjustable range of high frequency attenuation from 0 to -10 dB.
MODEL 605B
35 watts (50 watts, peak)
20-20,000 Hz
97 dB SPL at 4 ft from 1
watt (equal to EIA rating
of 50 dB at 30' from 1
mw) or 112.4 dB SPL at 4
ft from 35 watts
16 ohms
25 Hz
LF: 3 inches
HF: 1% inches
90°
40°
Alnico V
•ARCHITECT'S AND ENGINEER'S SPECIFICATIONS-
Weight:
Structure Weight:
Flux:
Crossover Network:
Terminals:
Diameter;
Mounting Data;
Weight:
LF
2.25 pounds
HF
0.531 pound
LF
15.13 pounds
HF
5 pounds
LF
11.000 Gauss
HF
14.000 Gauss
1,600 Hz full-section (fur
nished with loudspeaker)
Binding Post (4)
15-5/16 inches
Baffle Opening: 13-5/8
inches
Mtg. Bolt. Cntrs; 8 holes
equally spaced on 149/16" diameter circle
Depth: 10 inches
28 pounds (with network)
The loudspeaker shall have a nominal impedance of 16 ohms. The low-frequency cone shall have
a free air resonance frequency of 25 Hz; the LF voice coil shall be 3 inches in diameter, edge-wound
with copper ribbon, and shall operate in a magnetic gap having a flux density of 11,000 Gauss,
derived from an Alnico V magnet having a weight of at least 2.25 pounds. The outer edge (rim)
of the LF cone shall utilize a high-compliance, mechanically-damped, cloth-surround which, com
plemented by the correct apex suspension (spider), shall be capable of reproducing the stated lowfrequency response.
The high frequency diaphragm shall be of aluminum, having tangential compliance, and shall be
properly loaded, acoustically, by a multicellular horn, compression-molded of heavy, high-impact
plastic. The frequency distribution pattern of the loudspeaker, owing to the use of this multi
cellular horn, shall be 90° by 40°. The HF voice coil shall be 1%" in diameter, edge-wound with
aluminum ribbon, and shall operate in a magnetic gap having a flux density of 14,000 Gauss,
derived from an Alnico V magnet having a weight of at least 0.531 pounds. High frequency dia
phragms having annular compliances and/or utilizing horns with spherical radiation patterns shall
be unacceptable under this specification.
The loudspeaker frame shall be of heavy cast construction. The high-frequency diaphragm and
voice coil assembly shall be field replaceable without the use of special tools or skills; this shall be
interpreted to mean that the loudspeaker shall incorporate self-centering dowels to insure proper
spacing and alignment of the diaphragm and voice coil assembly.
The loudspeaker shall be Altec Model 605B.
%
LITHO IN U.S.A. CP-673-5K
Specifications and components subject to change toithout
notice. Overall performance will be maintained or improved.
AL-1413-1
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