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What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.



H.H. Scott '59





Altec Lansing 605B

ALTEC 605B DUPLEX
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 system. 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, fullsection 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 loudspeakers 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 2¼'' 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 doubling of 'bottoming' - even at full rated power.
Specifications
Power: 35 watts (50 watts, peak)
Frequency Response: 20 – 20,000 hZ
Pressure Sensitivity: 97 dB SPL at 4 ft from watt (equal to EIA rating of 50dB at 30' from 1 mw or 112,4 dB 30' from 1 mw) or 112,4 dB SPL at 4 ft from 35 watts
Impedance: 16 ohms
Cone Resonance: 25 Hz
Voice Coil Diameters: LF : 3 inches, HF : 1¾ inches
Horizontal Distribution: 90°
Vertical Distribution: 40°
Magnet Type: Alnico V
Weight: LF : 2,25 pounds
HF : 0,531 pound
Structure Weight: LF : 15.13 pounds
HF : 5 pounds
Flux: LF : 11,000 Gauss
HF : 14,000 Gauss
Crossover Network: 1,600 Hz full-section (furnished with loudspeaker)
Terminals: Binding Post (4)
Diameter: 15-5/16 inches
Mounting Data: Baffle Opening 13-5/8inchs, Mtg. Bolt. Cntrs.: 8 holes equally
spaced on 14-9/16 diameter circle
Depth: 19 inches
Weight: 28 pounds




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