Altec Lansing 808-8A User's Manual
Contents
1. utilize a Symnbistih diaphragm coupled to a voice coil that shall be edge wound of aluminum ribbon and that shall be 1 3 4 in diameter The voice coil gap shali have a flux density of at least 15 250 Gauss produced by a magnet having a weight of 1 2 pounds A machined phasing plug which also serves as the pole piece shall have two exponential acoustic slots and shall be utilized to provide the proper phase relationship between the sound emanating from the center and edges of the diaphragm and voice coil assembly thus ensuring maximum high frequency reproduction while maintaining a smooth overall response The entire diaphragm and voice coil assembly shali be field replaceable without requiring special tools or skills this shail be interpreted to mean that the loudspeaker shall incorporate self centering dowels to ensure proper spacing and alignment of the dia phragm and voice coil assembly 3 3S 3 gt 9 a ked 3 amp O lt 3 gt i 3 3 authorized Altec Sound Contractors and Distributors This will assure of proper installation We recommend that The HF driver loudspeaker shail produce a sound pressure level of at least 111 7 dB with 1 watt input and 126 4 dB with 30 watts in put at a distance of 4 feet from the mouth of a 30 trumpet when a warble band of 500 to 2500 Hz is used Single frequency meas urements shall not be acceptable under this specification The frequency response of the HF driv2. 6 4 dB at 30 watts 8 ohms 1 75 vey HF Driver loudspeaker for wide range 2eway Application HF Driver loudspeaker for wide range 2 way studio Playback systems studio Playback systems Protection N501 8A dividing network and 511A or 511B N501 8A dividing network and 511A or 511B horn for 500 Hz crossover N801 8A dividing horn for 500 Hz crossover N801 8A dividing network and 811B forn for 800 Hz crossover network and 811B horn for 800 Hz crossover Magnet Weight 13 oz 1 2 Ibs Flux Density 13 000 Gauss 15 250 Gauss Dimensions 4 1 2 Diameter 4 1 2 Diameter 3 1 4 Deep 3 11 16 Deep Weight 5 Ibs 11 oz 7 Ibs Finish Black matte Black matte Accessories 511A 511B 811B sectoral horns N501 8A 511A 511B 811B sectoral horns N501 8A N801 8A dividing networks 70 7V transformers N801 8A dividing networks 70 7V transformers For multicellular horns use ALTEC driver loudspeaker models 730 288 290 or 291 lt item ARCHITECTS AND ENGINEERS SPECIFICATIONS ae FOR ALTEC 807 8A The high frequency driver loudspeaker shall utilize a Sgrnbiotihe diaphragm coupled to a voice coil that shall be edge wound of aluminum ribbon and that shall be 1 3 4 in diameter The voice coil gap shall have a flux density of at least 13 000 Gauss produced by a magnet having a weight of 13 ounces A machined phasing plug which also serves as the pole piece shall have two exponential acoustic slots and shall be utilized
3. 807 8A amp 808 8A Driver Loudspeakers ae Magnetic Structure iaphragm Aynbistie laphragm Phasing Plug Diaphragm and Voice Coil Assembly Screen Cer Throat Plate Voice Coil Magnet Features Syinbistik m Diaphragm 500 20 000 Hz Response Smooth Peak Free Response Extremely High Efficiency Low Distortion Faithful Reproduction Edge Wound Voice Coil Greater Power Capacity Compact Easily Installed Field Repiaceable Diaphragm and Voice Coil Assembly A LANSING A quality company of LTV Ling Altec Inc ALTEL l l l PROFESSIONAL PLAYBACK SOUND SYSTEMS BROADCAST amp RECORDING STUDIOS BALL ROOMS AUDITORIUMS SCHOOL amp CHURCH MUSIC ROOMS MUSIC HALLS THEATRES NIGHT CLUBS DANCE STUDIOS WIDE RANGE MUSIC SYSTEMS The ALTEC 807 8A and 808 8A High Frequency Driver Loudspeakers are designed for all professional PLAYBACK applications requiring outstanding reproduction of sound over an extremely wide frequency range at substantial power levels Such conditions are readily fulfilled with unusually high efficiency and exceptionally uniform response from 500 or 800 Hz dependent on the dividing network and horn employed to over 20 000 Hz When used in conjunction with the ALTEC 511A 511B 500 Hz or 811B 800 Hz sectoral horn the N501 8A 500 Hz or N801 8A 800 Hz network a
4. er shall be uniform over the range of specify one 500 to 20 000 Hz with the ALTEC 511A or 511B sectoral horn and N501 8A dividing network 800 to 20 000 Hz with the ALTEC 811B sectoral horn and N801 8A dividing network Any high frequency driver loudspeaker not meeting all of the foregoing requirements shali not be acceptable under this specification The high frequency driver loudspeaker shall be ALTEC Lansing mode 808 8A LITHO IN U S A CP 119 5K z E AL 1777 Specifications and components subject to change without notice Overall performance will be maintained or improved
5. nd the 414 515 or 416 8A low frequency loudspeaker the 807 8A and 808 8A furnish the realistic reproduction demanded by all major broadcasting stations re cording studios theatres auditoriums and music halls Both the 807 8A and 808 8A transducers utilize a voice coil of notably large diameter 1 3 4 edge wound with aluminum ribbon and coupled to a large Aynbiolile diaphragm A mechanical phasing plug i e pole piece having two exponential acoustic slots is Utilized to provide the proper phase relationship between the sound emanating from the center and outer edges of the diaphragm and voice coil assembly thus ensuring maximum high frequency reproduction while maintaining a smooth overall response Either driver is capable of uniform peak free reproduction to a point far above the range of human hearing The entire diaphragm and voice coil assembly of the 807 8A and 808 8A is field replaceable no special tools are required For full range systems utilizing low frequency loudspeakers of relatively low efficiency located in non reverberant areas having moderate ambient noise levels the 807 8A driver proves a perfect match Such conditions would be analagous to the average listening room or smaller broadcast and recording studio In instances wherein relatively high ambient noise is present and where maximum efficiency of both vocal speech and music must be reproduced with great clarity the heavier magnet weight and greater flux densi
6. to provide the proper phase relationship between the sound emanating from the center and edges of the diaphragm and voice coil assembly thus ensuring maximum high frequency reproduction while maintaining a smooth overall response The entire diaphragm and voice coil assembly shail be field replaceable without requiring special tools or skills this shali be interpreted to mean that the loudspeaker shall incorporate self centering dowels to ensure proper spacing and alignment of the dia phragm and voice coil assembly you continuing source of knowledgeable advice service and quick warranty protection The HF driver loudspeaker shall produce a sound pressure level of at least 109 5 dB with 1 watt input and 124 2 dB with 30 watts input at a distance of 4 feet from the mouth of a 30 trumpet when a warble band of 500 to 2500 Hz is used Single frequency measurements shall not be acceptable under this specification The frequency response of the HF driver shall be uniform over the range of specify one 500 to 20 000 Hz with the ALTEC 511A or 511B sectoral horn and N501 8A dividing network 800 to 20 000 Hz with the ALTEC 811B sectoral horn and N801 8A dividing network Any high frequency driver loudspeaker not meeting all of the foregoing requirements shall not be acceptable under this specification The high frequency driver loudspeaker shall be ALTEC Lansing mode 807 8A FOR ALTEC 808 8A The high frequency driver loudspeaker shail
7. ty of the 808 8A are preferred The 808 8A represents one of the finest high frequency transducers manu factured by ALTEC the 2 dB greater efficiency over the 807 8A coupled with the same precision accuracy of minute production tolerances make the 808 8A the industry standard for laboratory and professional usage alike These factors together with the all important ALTEC criteria of engineering experience combine to produce the 807 8A and 808 8A high frequency loudspeakers of virtually matchless quality and limitless application 1515 S Manchester Ave Anaheim Calif 92803 New York ALTEC DESCRIPTION Power Rating Frequency Response Pressure Sensitivity impedance Voice Coil Diameter 807 8A 808 8A SPECIFICATIONS MODEL 8078A Up to 30 watts rms based on continuous oper ation with white noise 500 Hz to 20 000 Hz and with ALTEC model N501 8A or N801 8A dividing network 500 to 20 000 Hz 109 5 dB w 1 watt input measured 4 from mouth of 30 horn over warble frequency range 500 2500 Hz Ref 0 0002 dynes cm2 for 1 watt input 124 2 dB at 30 watts 8 ohms 1 75 MODEL 808 8A Up to 30 watts rms based on continuous oper ation with white noise 500 Hz to 20 000 Hz and with ALTEC modei N501 8A or N801 8A dividing network 500 to 20 000 Hz 111 7 dB w 1 watt input measured 4 from mouth of 30 horn over warble frequency range 500 2500 Hz Ref 0 0002 dynes em2 for 1 watt input 12
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