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ALTECS"THEVOICEOFTHETHEATRE®IN 1945, ALTEC INTRODUCED anamazing series of two-way speaker sys­tems to the world of motion pictureentertainmen t. Their success was in­stantaneous! Following prolonged com­petitive tests, this series of speaker sys­tems became the only commerciallyavailable sound for motion pictures ap­

proved by the Research Council of the Academy of MotionPicture Arts and Sciences...thereby , establishing the "TheVoice of the Theatre" as the "standard" of the entire in­dustry. Thus Altec's "The Voice of the Theatre" was borngiving new life to such memorable motion pictures releasedin the fall of 1945 as "The Green Years," "The Postman al­ways Ring Twice," and the spectacular "Ziegfeld Follies,"and characterizing every aspect of vivid realism in the repro­duction of voice, music and sound effects .

Today, theatres throughout the United States, and manyforeign countries the world over, depend upon "The Voiceof the Theatre" two-way speaker systems, for the splendorand sound dimension of multi -channel stereo for motionpictures and live reinforcement. Success of "The Voice ofthe Theatre" has spread beyond the theatre - adding newrealism to the excitement of sports events in arenas, stadi­ums and coliseums; to oratory and musical presentations inauditoriums; to the intimacy of night club shows; to theserious sermons, and choral music in churches .

From the beginning of the stereophonic sound era, Altechas been called upon for speakers of highest quality capableof recreating movement of the apparent sound source . Thisnew dimension of sound produced with Altec "The Voiceof the Theatre" stereo speakers first thrilled the public in1953 through the motion picture releases "House of Wax,"and "This is Cinerama." Altec continues to move forwardbreathing new life into its marvelous "The Voice of theTheatre" speaker system with notable engineering advancesin high frequency drivers, bass speakers, HF horns and divi­ding networks .

Altec's "The Voice of the Theatre" has earned its name byexcelling in prolonged competitive tests to become the"Standard" of the entire motion picture industry, a position'ithas held since birth .

And Now...From Altec's famous ''The Voice of the "Thea­tre" family, where entertainment quality achieves the high­est most substantial expression of performance , comes a"Third Generation" of speaker systems, acoustically en­gineered for any theatre or auditorium application .

Obedient to the industry's demands for improved perfor­manced to meet the requirements of magnetic recording, Al­tee engineers, after many months of intensive development,bring still greater "life" and realism to the motion picturescreen, with the new Symbiotik 1 M diaphragm. Designed forthe .high frequency compression drivers of the "The Voiceof the Theatre" system, the diaphragm compliance is com-

posed of polyimide material providing an extended frequen­cy response, doubling the audio power handling capability.The use of polyimide material extends the life of the as­sembly because of its high resistance to fatigue and stress.The physical geometry of todays modern theatre dictatesthe requirements for stereophonic reproduction and wideangle sound distribution. Multi-channel stereo (up to fivechannels), requires that speakers placed at the far right andfar left of the theatre provide smooth listening coverage forthe entire seating area , equally as well as the center speakers.Altec 's new "Third Generation" of "The Voice of the Thea­tre" speaker systems, the A9 and AlD, meet these require­ments by incorporating a sectoral horn of improved design,plus a low frequency section extremely shallow in depth,that conserves expensive back stage space, thereby increas­ing the audience seating area.

Altec , intent on continuous improvement, carries the deve­lopment of speaker systems forward with the new A8, "TheVoice of the Theatre" system, designed particularly for theshopping center or "Mini-Theatre" . While smaller in sizethan the other "The Voice of the Theatre" systems, the A8delivers "Big" performance quality, and is only 12" deep.

AIO "Tile Voice of tile Theatre "

SPEAKERSYSTEMS" TKAJ)ITI( )NA LLY AR·II( ULAn " . .ALTEr:.. . . .()H~I)I F NT TO TH E D EMANDS

OF IMP KOV FD FNG INH RINC DI:SICN . REMAINS LJNO IAI I ~ NCFJ) IN THE

MA NUFACTURE O F RECO KD ING AND KEPKO DUC INC EQ UIPME T.

A9 "The Voice of th e Theatre"

The Altec A9 and A 10 Theatre Series Speaker Systems, arefull two-way theatre type systems, with adjusta ble dividingnetworks and transducers of the highest efficiency. Bothsystems, mounted in a large infinite baffle LF bass loud­speaker enclosure, assure exceptionally clean bass response ,and extremely wide angular dispersion of the bass notes.These enclosures provide considerable savings in back ofthe screen space, versus other types of enclosures .

Frequency response of the A9 and AlO Theatre Series Spea­ker Systems are uniformly flat over a bandwidth extendingbeyond the requirements of the most exacti ng specificationsof the modern theatre . The low frequency section of theA Ia system employs four (4) IS-inch cone type transducersand the A9 uses two (2) IS-inch cone type speakers. Properphasing of the high and low frequency elements is provided.

The high frequency section completely devoid of bends ornon-metallic construction, consists of a highly efficient com­pression-type driver, embodying a revolutionary new dia­phragm of Symbiotik TMconstruction , coupled to a straightcast aluminum sectora l horn, providing uniform coverageover a horizontal angle of 90° and a vertica l angle of 40".Crossover frequency is 500 Hz, derived by means of a full­section dividing network. The A9 system is designed to oper­ate with a power amplifier audio output of 50 watts RMSand the Ala is rated at 100 watts RMS.

The A2 and A2X "The Voice of the Theatre " syste ms, f or the lar­gest Motion Picture Theatres

The large frequency horn and four 515B low frequencyspeaker units with this system provide an extended bass re­sponse, completely realistic in the reproduction of sound .The A2 system has two Altec 288C high frequency driverunits, and is rated at 80 watts. The A2X system is the sameas the A2, except that four 288C high frequency driverspeakers are adapted to one multice llular horn which allowsthe full use of the amplifier up to 150 watts.

The A5X ''The Voice oJ theTheatre" system is similar tothe A7 series in cabinetry andits use of the Altec 825 lowfrequency horn for unmatchedpower and perfection. De­signed to handle superb cover­age over any wide area, theA5X employs a multi-cellularhorn, and high and low fre­quency driver-loudspeaker likethose in the A4 series, (SeeComponent 'Chart) . Faithfulreproduction and perfect bal­

A5X "The Voice of the Theatre " ance of sound, add realism tovoice, music and sound effects, and provides the greatestflexibility in audience area coverage.

The A7-8 speaker systemwhile smaller in size than theAI, A2, and A4 series sys­tems, still maintains the highquality of reprod uction foundin all the "The Voice of theTheatre" two-way speakersystems ...and being smaller inphysical size, is designed for"full quality sound" in areasof less cubic volume thanthose requiring the larger sizesystems . Compactness of de­

A7-8 "The Voice of the Theatre " sign permits the use of theA7-8 in smaller or medium size auditoriums, churches, nightclubs, meeting halls, and similar type rooms.

The A7-8 employs Altec's 807-8A high frequency driverunit connected to an 811B sectoral horn for the reproduc ­tion of frequencies over 800 Hz. The low frequencies arereproduced by the Altec 416-SA in the A7-8 and A7-500-Ssystem and by the 515B in the A7XX system.

The A4 and A4X "The Voiceof the Theatre" speaker sys­tems provide the ultimate insound by combining high andlow frequency horns for un­matched power and perfec­tion . Seven feet tall withoutthe multicellular horn (SeeComponent Chart for overalldimensions), both systems uselow frequency horns allowing

A4 - A4X higher power input without"The Voice of the Theatre " distortion for faithful repro­

duction and perfect balance of sound .

The A4 system has one Altec 288C high frequency driver,and is rated at 40 watts. Almost identical to the A4, theA4X system employs two Altec 288C high frequency dri­vers, and is rated at 60 watts. Constructed of heavy material,and acoustically traced to prevent vibration, these systemsmount in walls, ceilings,or suspended overhead in large areas.Designed to provide the finest 'entertainment sound quality'both the A4 and A4X maintain the power and efficiency tohandle superb coverage over any wide area.

The Altec A8 "The Voice ofthe Theatre" speaker systemhas been designed particularlyfor the small shopping center,or "Mini-Theatre," with limi­ted back of the screen space.It is equally well suited for'surround speaker' usagewherequality cannot be comprised.Only 12" deep, the AS cantie used in those installat ionswhere tight control must bemaintained over the horizon­

A8 "The Voice of the Theatre " tal and vertical sound distri­bution without loss of 'entertainment sound quality .'The A8 system employs a compression type driver coupledto an exponential type horn for reproduction of tones abovethe crossover point. The low frequencies are reproduced bya heavy duty low frequency driver. The enclosure is of thebass-reflex type, which despite the short front to back di­mension , has sufficient volume for the most demanding lowfrequencies. The A8 should be limited to motion picturetheatres of 600 seats or less. Sound coverage by a singlespeaker system being mounted behind the screen is ade­quate up to 50 feet. For distances up to 100 feet, satisfac­tory sound coverage may be had by the installation of threeA8 systems.

STANDARD"VO ICE OF THE THEATRE"

COMPONENT CHART

MatchingAmplifier Trans- Overall Approx.

Power L. F. H. F. H. F. Distribution FixedPad former Size - Inches ShippingModel (Walts' Drivers Driver, Horn Throat V. H. Network IAttenuator) L. F. H W 0 WI. Lbs.

Al ·X 200 (6) 5158 (4) 288C 18048, 2·30110 600 x 1250 N500C None None 113" x 152" x 39Y, ' 2200.or 15048, 2-30170 600 x 105° None None 113" x 152" x 39Y,"

or 10048 2-30110 400 x 1000 None None 105" x 152" x 39Y,"

Al 100 (6) 5158 (2) 288C 15058, 1·30172 60° x 1050 N500C None None 108Y," x 152" x 39Y," 2150

or 10058 1·30110 40° x 1000 None None 102)1,"x 152" x 39Y,"

A2·X 150 (415158 (4' 288C 18048, 2-30170 600 x 125° N500C None None 113" x 113" x39 Y," 1400

or 15048, 2-30170 600 x 105° None None 113" x 113" x 39Y,"

or 10048 2-30110 400 x 100° None None 105" x 113" x 39Y," '-I

A2 80 (4) 5158 12l 288C 15058, 1-30112 60° x 1050 N500C None None 108Y," x 113" x 39Y," 1250

or 15008 1-30110 400 x 100° None None 102y," x 113" x 39Y,"

A4-X 60 (2) 5158 (2) 288C 15058, 1-30172 600 x 105° N500C None None 108Y," x 80Y," x 39Y," 775

A4 40 (2) 5158 II) 288C 15058, 1-30166 600 x 105° N500C None None 108Y," x 80Y,"x 39)1," 750

or 10058, 1-30210 400 x 1000 None None 102Y," x 80Y," x 39Y,"

or 8058 1-30162 40° x 800 None None 102)1,"x 80Y," x 39Y,"

A5·X 35 (1) 5158 (l) 288C 15058, 1-30166 60° x 1050 N500C None None 64" x 3011," x 30" 275

or 10058, 1-30210 40° x 1000 None None 59" x 30" x 27"

or 8058 1-30162 40° x 80° None None 59" x 30" x 27"

ItA7-S· 50 (1) 416-8A (H 807-SA 8118 None 400 x 90° N801-8A None None 5214" x 30" x 24" 135

A7-500-a* 50 (1) 416-8A (1) 80B-SA 5118 None 400 x 900 N501-8A None None 5414" x 30" x 24" 142

A8 30 (H 416A (1) 806A 30623 None 60° x 900 N800G None None 42" x 30" x 12" 110

A9 50 (2) 5158 (1) 806-16A 5110 None 40° x 900 N500F #10·02-03-120 15067 95-5/8" x 48" x 24" 510

RMS

Al0 100 (4) 5158 rn 291-16A 311-908 None 400 x 90° N500F #10-02-03-120 15067 98-1/2" x 72" x 24" 815

RMS

· For sound systems used with amplifiers having continuous power rat ings of up to 50 watts.

A qual ily company 01L TV Ling Alle e, Inc .

1515 S. MANCHESTER AVE., ANAHEIM, CALIF. 92803L IT HO I N u .s...... A L-1315-6