User manual ALTEC LANSING 288-16G HF DRIVERS

[. . . ] The geometry of the MR II 564B reduces the problem of high frequency beaming and maintains uniform dispersion at all frequencies within the rated frequency range. Therefore, the same quality sound will be heard by listeners sitting off-axis and on-axis to the MANTARAYTM horn. Altec Lansing's 21216B adapter is constructed of heavy gauge aluminum. [. . . ] This adapter is the perfect choice for coupling the 909-8B and 909-16B to our MANTARAYTM series horns. FREQUENCY RESPONSE 1, 2 909-8B with MR II 564B: 500 Hz ­ 20 kHz (flat 500 Hz ­ 6 kHz) USABLE LOW FREQUENCY LIMIT 1, 2 500 Hz USABLE HIGH FREQUENCY LIMIT 1, 2 20 kHz SENSITIVITY 3 909-8B with MR II 564B: 110 dB SPL POWER HANDLING 4 > 500 Hz: 30 W continuous; 120 W peak > 1 kHz: 60 W continuous; 240 W peak MAXIMUM OUTPUT (1 m) 5 909-8B with MR II 564B: 130 dB SPL COVERAGE ANGLES 6 MR II 564B: 60º (horizontal) by 40º (vertical) DIRECTIVITY FACTOR, Q 6 MR II 564B: 23. 0 DIRECTIVITY INDEX, DI 6 MR II 564B: 13. 6 dB IMPEDANCE 7 Nominal: 8. 0 Ohms or 16. 0 Ohms Minimum: 8. 0 Ohms or 16. 0 Ohms at 6 kHz HARMONIC DISTORTION 8 THD: 1. 59% INPUT CONNECTIONS 1 x 2 position barrier strip with 0. 250 in. blade type terminals FINISH Dark gray enamel REPLACEMENT HF DIAPHRAGM ASSEMBLY 26420: 8 Ohms 26421: 16 Ohms MOUNTING DATA (DRIVERS) Two 3/8-24 studs on a 3. 0 in. diameter bolt circle (Altec Lansing Standard) DIMENSIONS 909-8B/16B Diameter: 5. 5 in. Wilshire Blvd. , Suite 362 · Oklahoma City, Oklahoma 73116 · Phone: 1-405-848-3108 · Fax: 1-405-848-3217 · www. altecpro. com ARCHITECT'S AND ENGINEER'S SPECIFICATIONS The motors shall be a small format high frequency compression driver. The power handling capability of these drivers shall be be 30W AES (120 W peak) > 500 Hz and 60W AES (240W peak) > 1 kHz. One driver shall have a minimum impedance of 8 ohms (at 6 kHz), and the other driver shall have a minimum impedance of 16 ohms (at 6 kHz). The voice-coil for these drivers shall be an edgewound, aluminum ribbon, which is 1. 75 inches (44 mm) in diameter. The drivers shall have a diaphragm that features an allmetal, Pascalite dome and tangential compliance. 2 The limits of the frequency response are referenced to -10 dB of the loudspeaker's rated sensitivity. 3 The sensitivity of the loudspeaker is the log based average SPL taken over the intended bandwidth of operation for the loudspeaker with a 2. 83 V swept sine stimulus. The data is measured and level corrected in a manner consistent with note 1. 4 The power handling capacity of the loudspeaker is tested using a full range form of AES Standard 2-1984. The test stimulus is band limited (500 Hz ­ 16 kHz) pink noise with a 6 dB crest factor. The applied RMS voltage is determined using the minimum impedance of the loudspeaker. The amplifier used to drive the loudspeaker has a minimum operating headroom of 6 dB referenced to the RMS voltage. [. . . ] The amplifier used to drive the loudspeaker has a minimum operating headroom of 6 dB referenced to the RMS voltage. 5 The peak output level of the loudspeaker is calculated based on the sensitivity and the peak power handling capabilities of the loudspeaker. 6 The coverage angles for the loudspeaker are taken as the -6 dB points of the directivity response and averaged from 500 Hz ­ 16 kHz. [. . . ]