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Manual abstract: user guide ALTEC LANSING 399-8A 16A HF DRIVER
Detailed instructions for use are in the User's Guide.
[. . . ] The robust Pascalite diaphragm extends the driver's power handling capability, while maintaining superior high frequency bandwidth. The compact magnetic motor-structure, utilizing a 6. 7 lbs. [. . . ] One driver shall have a minimum impedance of 8 ohms (between 4 kHz and 5 kHz), and the other driver shall have a minimum impedance of 16 ohms (between 4 kHz and 5 kHz). The voice-coil for the drivers shall be an edge-wound, aluminum ribbon, which is 2. 83 inches (72 mm) in diameter. These drivers shall have a diaphragm that features an all-metal, Pascalite dome and tangential compliance. The magnetic gap of these drivers shall have a flux density of 2. 05 T, resulting from a 6. 7 lbs. A TangerineTM phasing-plug with thirteen radial acoustic slots shall provide the proper phase relationship between sound emanating from the center and edges of the diaphragm's dome on these drivers. The entire diaphragm and voice-coil assembly for these drivers shall be field replaceable without requiring special tools, because adjustable dowel pins shall allow each voice coil to be precisely centered in the magnetic gap. The driver shall be 7. 7 inches (196 mm) in diameter by 3. 88 inches (99 mm) deep, excluding the one inch (25. 4 mm) depth of the mounting studs. The driver shall weigh 20. 6 pounds (9. 3 kg). The high frequency compression drivers shall be the Altec Lansing model 399-8B and the Altec Lansing model 399-16B. The projectors shall be constant-directivity mid and high frequency horns. These horns shall have an operating bandwidth of 500 Hz 20 kHz. One horn shall have a mean horizontal dispersion angle of 60° and a mean vertical dispersion angle of 40°. The other horn shall have a mean horizontal dispersion angle of 90° and a mean vertical dispersion angle of 40°. When the 399-B series drivers are coupled to the 90° x 40° horn, this combination shall have a sensitivity of at least 110 dB, when measured on-axis, at a distance of one meter, with a one Watt input. When the 399-B series drivers are coupled to the 60° x 40° horn, this combination shall have a sensitivity of at least 112 dB, when measured on-axis, at a distance of one meter, with a one Watt input. [. . . ] The distortion percentages are log based averages from 500 Hz 10 kHz.
VISIT WWW. ALTECPRO. COM FOR · Authorized EASE data on all Altec Lansing Professional loudspeakers · Specification sheets in . pdf format. Download page 1 of the specification sheet for you submittals. [. . . ]
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