Altec Lansing 807-8A User Manual

807-8A & 808-8A Ihiver LwdspetJim

807-8A

features:

" 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 Replaceable Diaphragm

and Voice Coil Assembly

PROFESSIONAL 'PLAYBACK' SOUND SYSTEMS BROADCAST & RECORDING STUDIOS - BALL ROOMS AUDITORIUMS • SCHOOL & 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 Fюwer 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,(X)0 Hz.

When used in conjunction with the ALTEC 511A, 51 IB (500 Hz) or 81 IB (800 Hz) sectoral horn, the

N501-8A (500 Hz) or N801-8A (8(Ю Hz) network, and 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 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 density

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.

ALTEC

A quality company of LTV Ling Altec. Inc.

LANSING®

1515 S. Manchester Ave., Anaheim, Calif. 92803

New York

ALTEC ^07-8A

808-8A

DESCRIPTION Power Rating:

Frequency Response: Pressure Sensitivity:

Impedance: Voice Coil Diameter: Application:

Protection:

Magnet Weight Flux Density: Dimensions:

Finish: A^essories:

MODEL 807-8A

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/cm^ for

1 watt input)

124.2 dB at 30 watts

8 ohms

1.75"

HF Driver louc^peaker for wide-range, 2-way

studio 'Playback' systems

N501-8A dividing network and 511A or 51 IB

horn for 500-Hz cro^ver; N801-8A dividing

network and 811В liorn for 800-Hz crossover.

13 oz 13,000 Gauss

4-1/2" Diameter

3-1/4" Deep

5 lbs, 11 oz

Black matte

511A, 51 IB, 81 IB sectoral horns*; N501-8A.

N801-8A dividing networks;

70.7V transformers.

*For multicellular horns, use ALTEC driver loudspeaker models 730, 288,290 or 291.

SPECIFICATIONS

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 model N501-8A or IMSOI-^A 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 dvnes/cm2 for

1 watt input)

126.4 dB at 30 watts 8 ohms

1.75"

HF Driver loudspeaker for wide-range, 2-way studio 'Playback' systems

N501-8A dividing network and 511A or 51 IB

horn for 500-Hz crossover; N801 ^A dividing network and 81 IB horn for 800-Hz crossover.

1.2 lbs

15,250 Gauss 4-1/2" Diameter

3-11/16" Deep

Black matte 511A,- 511B, 811B sectoral horns*

N801-8A dividing networks;

70.7V transformers.

N501-8A,

ARCHITECTS AND ENGINEERS SPECIFICATIONS

(FOR ALTEC 807-8A)

The high-frequency driver loudspeaker shall utilize a diaphragm coupled to a voice coil that shall be edge-wound of aluminum ribbon arxl 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 aodustic 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 diaphra^ ar>d voice coil assembly shall be field replaceable without requiring special tools or skills; this shall 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.

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 25(X) 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 51 IB sectoral horn and N501-8A dividing network. 800 to 20.000 Hz with the ALTEC 81 IB sectcxal 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 model 807-8A.

(FOR ALTEC 808-8A)

The high-frequency driver loudspeaker shall utilize a 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 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 ^sembly, thus ensuring maximum high-frequency reproduction while maintaining a smooth overall response. The entire diaphragm and voice coil assembly shall be field replace^le without requiring special tools or skills; this shall 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.

The HF driver loudspeaker shall 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 teind of 500 to 2500 Hz is used. Single frequency meas urements 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 511Aor511B sectoral horn and N501-8A dividing network. 800 to 20,000 Hz with the ALTEC 81 IB 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 model 806-8A.

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Specifications and components subject to change without notice. Overall performance will be maintained or improved.

AL-1777