User manual ALTEC LANSING 909-8A HF DRIVERS

[. . . ] The robust Pascalite diaphragm extends the driver's power handling capability, while maintaining superior high frequency bandwidth. An exclusive TangerineTM radial phasing-plug assures a smooth upper range response. [. . . ] A TangerineTM phasing-plug with eleven 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. The drivers shall be 5. 5 inches (140 mm) in diameter by 2. 7 inches (69 mm) deep, excluding the one inch (25. 4 mm) depth of the mounting studs. The drivers shall weigh 6. 4 pounds (2. 9 kg). The high frequency compression drivers shall be the Altec Lansing model 909-8B and the Altec Lansing model 909-16B. The projector shall be a constant-directivity mid and high frequency horn. The horn shall have a mean horizontal dispersion angle of 60° and a mean vertical dispersion angle of 40°. When the 909-B series drivers are coupled to the 60° 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. The constant-directivity mid and high frequency horn shall be the Altec Lansing model MR II 564B. The adaptor shall be designed to couple Altec Lansing's small format drivers to large format 1. 4" horns. This adapter shall be Altec Lansing's model 21216B. FREQUENCY RESPONSE AND IMPEDANCE MAGNITUDE OF 909-8B ON MR II 564B As we are continually striving to improve Altec Lansing products, specifications are subject to change without notice. Please visit www. altecpro. com for the latest information on Altec Lansing Professional products. SPECIFICATION NOTES 1 The frequency response of the loudspeaker is measured at a distance of no less than 3 meters to obtain full range data. [. . . ] 8 The distortion measurements of the loudspeaker are performed at a distance of 1 m with RMS input voltages corresponding to 10% of rated power handling calculated using minimum loudspeaker impedance. 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. [. . . ]