Web: http: // www. pearl - hifi. com E-mail: custserv @ pearl - hifi. com
86008, Ave. SW, Calgary, AB; CAN T2T 1Z6 Ph: +.1.403.244.4434 Fx: +.1.403.244.7134
Precision Electro-Acoustic Research Laboratory
Hand-Builders of Fine Music-Reproduction Equipment
Please note that the links in the PEARL logotype above are live and can be used to direct your web browser to our site or to open an e-mail message window addressed to ourselves. To view our item listings on eBay, click here. To see the feedback we have left for our customers, click here.
This document has been prepared as a public service. Any and all trademarks and logotypes used herein are the property of their owners. It is our intent to provide this document in accordance with the stipulations with respect to fair use as delineated in Copyrights - Chapter 1: Subject Matter and Scope of Copyright; Sec. 107. Limitations on exclusive rights: Fair Use. Public access to copy of this document is provided on the website of Cornell Law School ( http://www4.law.cornell.edu/uscode/17/107.html ) and is here reproduced below:: Sec. 107. - Limitations on exclusive rights: Fair Use
Notwithstanding the provisions of sections 106 and 106A, the fair use of a copyrighted work, including such use by reproduction in copies or phonorecords or by any other means specied by that section, for purposes such as criticism, comment, news reporting, teaching (including multiple copies for classroom use), scholarship, or research, is not an infringement of copyright. In determining whether the use made of a work in any particular case is a fair use the factors to be considered shall include:
1 - the purpose and character of the use, including whether such use is of a commercial nature or is for nonprot educational purposes; 2 - the nature of the copyrighted work; 3 - the amount and substantiality of the portion used in relation to the copy righted work as a whole; and 4 - the effect of the use upon the potential market for or value of the copyrighted work. The fact that a work is unpublished shall not itself bar a nding of fair use if such nding is made upon consideration of all the above factors

PDF Cover Page

Blank Page
ALTECS VOICE "THE OFTHE THEATR
IN 1945, ALTEC INTRODUCED an amazing series of two-way speaker systems to the world of motion picture entertainmen t. Their success was instantaneous! Following prolonged competitive tests, this series of speaker systems became the only commercially available sound for motion pictures approved by the Research Council of the Academy of Motion Picture Arts and Sciences.thereby , establishing the "The Voice of the Theatre" as the "standard" of the entire industry. Thus Altec's "The Voice of the Theatre" was born giving new life to such memorable motion pictures released in 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 many foreign countries the world over, depend upon "The Voice of the Theatre" two-way speaker systems, for the splendor and sound dimension of multi -channel stereo for motion pictures and live reinforcement. Success of "The Voice of the Theatre" has spread beyond the theatre - adding new realism to the excitement of sports events in arenas, stadiums and coliseums; to oratory and musical presentations in auditoriums; to the intimacy of night club shows; to the serious sermons, and choral music in churches. From the beginning of the stereophonic sound era, Altec has been called upon for speakers of highest quality capable of recreating movement of the apparent sound source. This new dimension of sound produced with Altec "The Voice of the Theatre" stereo speakers first thrilled the public in 1953 through the motion picture releases "House of Wax," and "This is Cinerama." Altec continues to move forward breathing new life into its marvelous "The Voice of the Theatre" speaker system with notable engineering advances in high frequency drivers, bass speakers, HF horns and dividing networks. Altec's "The Voice of the Theatre" has earned its name by excelling in prolonged competitive tests to become the "Standard" of the entire motion picture industry, a position 'it has 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 picture screen, with the new Symbiotik 1 M diaphragm. Designed for the.high frequency compression drivers of the "The Voice of the Theatre" system, the diaphragm compliance is composed 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 dictates the requirements for stereophonic reproduction and wide angle sound distribution. Multi-channel stereo (up to five channels), requires that speakers placed at the far right and far left of the theatre provide smooth listening coverage for the 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, "The Voice of the Theatre" system, designed particularly for the shopping center or "Mini-Theatre". While smaller in size than the other "The Voice of the Theatre" systems, the A8 delivers "Big" performance quality, and is only 12" deep.

AIO "Tile Voice of tile Theatre "

SPEAKER SYSTEMS

" TKAJ)ITI( )NA LLY ARII( ULAn ". ALTEr:. ()H~I)I F N T TO TH E D EMA N DS. OF IMP KOV FD FNG INH RIN C DI:SICN. REMA INS LJNO IAI I ~ NCFJ) IN THE O MA NUFACTURE O F RECO KD ING AND KEPK DUC INC EQ UIPME T.
The A2 and A2X "The Voice of th e Theatre " syste ms, f or the largest Motion Picture Theatres
A9 "The Voice of th e Theatr e" The Altec A9 and A 10 Theatre Series Speaker Systems, are full two-way theatre type systems, with adjusta ble dividing networks and transducers of the highest efficiency. Both systems, 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 of the screen space, versus other types of enclosures. Frequency response of the A9 and AlO Theatre Series Speaker Systems are uniformly flat over a bandwidth extending beyond the requirements of the most exacti ng specifications of the modern theatre. The low frequency section of the A Ia system employs four (4) IS-inch cone type transducers and the A9 uses two (2) IS-inch cone type speakers. Proper phasing of the high and low frequency elements is provided. The high frequency section completely devoid of bends or non-metallic construction, consists of a highly efficient compression-type driver, embodying a revolutionary new diaphragm of Symbiotik TMconstruction , coupled to a straight cast aluminum sectora l horn, providing uniform coverage over 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 RMS and the Ala is rated at 100 watts RMS.
The large frequency horn and four 515B low frequency speaker 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 driver units, and is rated at 80 watts. The A2X system is the same as the A2, except that four 288C high frequency driver speakers are adapted to one multice llular horn which allows the full use of the amplifier up to 150 watts. The A5X ''The Voice oJ the Theatre" system is similar to the A7 series in cabinetry and its use of the Altec 825 low frequency horn for unmatched power and perfection. Designed to handle superb coverage over any wide area, the A5X employs a multi-cellular horn, and high and low frequency driver-loudspeaker like those in the A4 series, (See Component 'Chart). Faithful reproduction and perfect balA5X "The Voice of th e Theatre " ance of sound, add realism to voice, music and sound effects, and provides the greatest flexibility in audience area coverage. The A7-8 speaker system while smaller in size than the A I, A2, and A4 series systems, still maintains the high quality of reprod uction found in all the "The Voice of the Theatre" two-way speaker systems.and being smaller in physical size, is designed for "full quality sound" in areas of less cubic volume than those requiring the larger size systems. Compactness of deA7-8 "T he Voice of th e Theatre " sign permits the use of the A7-8 in smaller or medium size auditoriums, churches, night clubs, meeting halls, and similar type rooms.

The A7-8 employs Altec's 807-8A high frequency driver unit connected to an 811 B sectoral horn for the reproduc tion of frequencies over 800 Hz. The low frequencies are reproduced by the Altec 416 -SA in the A7-8 and A7-500-S system and by the 515B in the A7XX system. The A4 and A4X "The Voice of the Theatre" speaker systems provide the ultimate in sound by combining high and low frequency horns for unmatched power and perfection. Seven feet tall without the multicellular horn (See Component Chart for overall dimensions), both systems use low frequency horns allowing A4 - A4X higher power input without " The Voice of th e Theatre " distortion for faithful reproduction 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, the A4X 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 systems mount 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 to handle superb coverage over any wide area. The Altec A8 "The Voice of the Theatre" speaker system has been designed particularly for the small shopping center, or "Mini-Theatre," with limited back of the screen space. It is equally well suited for 'surround speaker' usage where quality cannot be comprised. Only 12" deep, the AS can tie used in those installat ions where tight control must be maintained over the horizonA8 " The Voice of the Theatre " tal and vertical sound distribution without loss of 'entertainment sound quality.' The A8 system employs a compression type driver coupled to an exponential type horn for reproduction of tones above the crossover point. The low frequencies are reproduced by a heavy duty low frequency driver. The enclosure is of the bass-reflex type, which despite the short front to back dimension , has sufficient volume for the most demanding low frequencies. The A8 should be limited to motion picture theatres of 600 seats or less. Sound coverage by a single speaker 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 three A8 systems.

STANDARD " VO ICE OF THE THEATRE" COMPONENT CHART
Amplifier Power (W alts' 200 Matching Transformer L. F. None None Non e None None None None None None None None None None None None None None None None None Overall Size - Inches W 0 Approx. Shipping WI. Lbs. 2200

M odel Al X

L. F. Drivers

H. F. Drive r, (4) 288C

H. F. Horn 18048, or 15048, or 10048 15058, or 10058 18048, or 15048, or 10048 15058, or 15008
Throat 230110 2-30170 2-130110 2-30170 2-30170 2-30110 1-30112 1-30110 1-30172 1-30166 1-30210 1-30162 1-30166 1-30210 1-30162

Distribution V. H.

Netw ork N500C
Fixed Pad IAttenuator) None None None None None None None None

(6) 5158

x x x 1000
113" x 152" x 39Y ' , 113" x 152" x 39Y," 105" x 152" x 39Y," 108Y x 152" x 39Y," ," 102)1,"x 152" x 39Y," 113" x 113" x39 Y, " 113" x 113" x 39Y," 105" x 113" x 39Y, " 108Y," x 113" x 39Y," 102y," x 113" x 39Y," 108Y x 80Y," x 39Y," ," 108Y," x 80Y,"x 39)1, " 102Y x 80Y x 39Y," ," ," 102)1,"x 80Y, x 39Y," " 64" x 3011, x 30" " 59" x 30" x 27" 59" x 30" x 27" 5214 x 30" x 24" " 5414 x 30" x 24" " 42" x 30" x 12" 95-5/8" x 48" x 24" 98-1/2" x 72" x 24"
60 x x x x x x x x x x x x x x x x x x x 90

(415158

(4' 288C

(4) 5158

12l 288C
None None None None None None

(2) 5158 (2) 5158

15058, 15058, or 10058, or 8058 15058, or 10058, or 8058

N500C N500C

775 750

II) 288C

None None None
50 A7-S A7-500-a* A8 A9 AlRMS 100 RMS
416-8A (1) 416-8A (H 416A

(H 807-SA

80B-SA (1) 806A

311-908

None None None None None
N801-8A N501 -8A N800G N500F N500F
None None None #1002-03-120 #10-02-03 -120

135 142

(2) 5158 (4) 5158

(1) 806-16A

510 815

rn 291-16A

For sound systems used with amplifiers having continuous power ratings of up to 50 watts.
A qual ily company 01L TV Lin g Alle e, Inc.
1515 S. MANCHESTER AVE., ANAHEIM , CALI F. 9280 3

L IT HO I N

u.s.. A L-1315-6.