Altec Lansing 291-8L User's Manual
Contents
1. 291 8L 291 16L COMPRESSION DRIVER LOUDSPEAKER ALTEC ENERG eceng LALTEC LANSING MODEL 291 8L HIGH FREQUENCY DRIVER TANGERINE raniar PHASING SYSTEM IMPEDANCE 8 OHMS MADE IN USA DESCRIPTION The Altec 291 8L and 291 16L Compression Driver loudspeaker has been designed for use in high level sound systems of the highest quality It may be used with Altec Mantaray multicellular or sectoral horns and will provide a smooth response from 500 13 000 Hz This wide range when used in conjunction with Altec low frequency loudspeakers will provide full high fidelity reproduction for the largest theatre or auditorium Improvements in diaphragm voice coil assemblies and magnetic structures allow the 291 8L and 291 16L to exact a smoother and ex tended response characteristic over the 500 13 000 Hz band The 291 16L has a minimum impedance of 16 ohms the 291 8L 8 ohms The diaphragm voice coil assembly of the 291 8L and 291 16L can be replaced in the field by un trained personnel without the use of special tools Adjustable dowell pins allow each voice coil to be precisely centered in the voice coil gap which has a flux density of 2 05 T derived from a 6 87 pound Ferrite V magnet These improvements combine to produce a high frequency compression driver loudspeaker of vir tually matchless quality and limitless application SPECIFICATIONS Power Capacity Frequency Response Pressur2. from lips of MR11594A horn Minimum impedance 8 ohms 291 8L 16 ohms 291 16L The voice coil shall be 2 8 in diameter of edge wound aluminum ribbon and shall operate in a magnetic gap hav ing a flux density of 2 05 T derived from a 6 87 pound Ferrite V magnet The diaphragm shall be an aluminum dome and shall have Kapton suspension A Tangerine phasing plug with 13 3 8 16UNC 50 DEEP 7 PL ROW 1 R radial acoustic slots shall serve as the pole piece and shall also be utilized to provide the proper phase relationship between the sound emanating from the center and edges of the diaphragm and voice coil assembly The entire diaphragm and voice coil assembly shall be field replaceable without requiring special tools or skills ad justable dowel pins shall allow each voice coil to be precisely centered in the voice coil gap The drive shall be 7 61 in diameter by 5 8 deep ex cluding 1 depth of mounting studs and shall weigh 30 5 pounds The compression driver loudspeaker shall be the Altec Model 291 8L or 291 16L ALTECS P O BOX 26105 OKLAHOMA CITY OKLAHOMA 73126 0105 U S A 1987 ALTEC LANSING CORPORATION REVISION 5 AL 2297 42 07 027070
3. e Sensitivity Minimum Impedance Construction Magnet Magnetic Structure Weight Diaphragm Voice Coil Dimensions Weight Finish Mounting Data 50 watts average pink noise Above measurement made on Altec 300 or 50 Hz horn with signal band limited from 500 20 000 Hz 500 13 000 Hz 109 dB SPL re 20 Pa with 1 W of pink noise band limited 500 Hz 16 kHz at 1 M from lips of MRII594A horn 291 8L 8 ohms 291 16L 16 ohms 6 87 pound Ferrite V 2 05 T flux density 29 5 pounds Aluminum dome with Kapton suspension 2 8 diameter of edge wound aluminum ribbon 7 61 19 32 cm diameter 5 8 14 8 cm depth less mounting studs 30 5 pounds 13 83 kg Gray Hammertone enamel User adjustable for Altec standard 3 bolt flange or 4 bolt flange 2 S B E _ 18 38em g 45 APART 3 250 DIA EQ SPCD FROMG 2 120 APART PRINTED IN U S A 1087 3 5M EQ SPCD FROMG 3 PL 4 750 DIA 1 3 4 OW 2 4 ARCHITECT S AND ENGINEER S SPECIFICATIONS The compression driver loudspeaker shall meet the following criteria Power capacity 50 watts average pink noise band limited from 500 20 000 Hz and measured with Altec 300 or 500 Hz horn Frequency response uniform from 500 to 13 000 Hz Pressure sensitivity shall be 109 dB SPL re 20 Pa with 1 W of pink noise band limited 500 Hz 16 kHz at 1 M
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