User manual ALTEC LANSING 299-8A HF DRIVER

[. . . ] The geometry of the MR II 564B and MR II 594B 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 MANTARAYTM horns are constructed of heavy-duty, weather resistant fiberglass. [. . . ] This construction technique results in a horn design that is surprisingly lightweight, yet extremely rugged and non-resonant. FREQUENCY RESPONSE 1, 2 399-8B/16B with MR II 564B: 500 Hz ­ 16 kHz 399-8B/16B with MR II 594B: 500 Hz ­ 16 kHz (flat 500 Hz ­ 6 kHz, with 6 dB/octave roll-off to 16 kHz) USABLE LOW FREQUENCY LIMIT (-10 dB) 1, 2 500 Hz USABLE HIGH FREQUENCY LIMIT (-10 dB) 1, 2 16 kHz SENSITIVITY 3 399-8B/16B with MR II 564B: 112 dB SPL 399-8B/16B with MR II 594B: 110 dB SPL POWER HANDLING 4 > 500 Hz: 40 W continuous; 160 W peak > 1 kHz: 80 W continuous; 320 W peak PEAK OUTPUT (1 m) 5 399-8B/16B with MR II 564B: 135 dB SPL 399-8B/16B with MR II 594B: 133 dB SPL COVERAGE ANGLES 6 MR II 564B: 60º (horizontal) x 40º (vertical) MR II 594B: 90º (horizontal) x 40º (vertical) DIRECTIVITY FACTOR, Q 6 MR II 564B: 23. 0 MR II 594B: 12. 9 DIRECTIVITY INDEX, DI 6 MR II 564B: 13. 6 dB MR II 594B: 11. 1 dB IMPEDANCE 7 Nominal: 8. 0 Ohms or 16. 0 Ohms Minimum: 8. 0 Ohms or 16. 0 Ohms between 4 kHz and 5 kHz HARMONIC DISTORTION 8 THD: 1. 47% INPUT CONNECTIONS 1 x 2 position barrier strip with 0. 250 in. blade type terminals FINISH Dark gray enamel REPLACEMENT HF DIAPHRAGM ASSEMBLY 25884: 8 Ohms 25885: 16 Ohms MOUNTING DATA (DRIVERS) Three 3/8-24 studs on a 3. 25 in. diameter bolt circle (Altec Lansing Standard) Four 3/8-24 studs on a 4. 75 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 large format high frequency compression drivers. These drivers shall have an operating bandwidth of 500 Hz ­ 16 kHz. The minimum power handling capability of the drivers shall be 40 W AES (160 W peak). 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. 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. 5 The peak output level of the loudspeaker is calculated based on the sensitivity and the peak power handling capabilities of the loudspeaker. [. . . ] 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. [. . . ]