CONVERGENCE

Hi, To understand what Tod AO and FOX used as speakers. Please read this article which involved the following companies Westrex Lansing And Ampex. http://www.audioheritage.org/html/history/jbl-pro/beginnings.htm

Hi Garyrc Concerning Radio City Music Hall . The system is 7.1 ; 5 channels each with 4 low frequency cabinets and 3 HF horns and with 8 dual subs and 90 surround speakers; all JBL. Concerning the picture with the A2 Altecs behind the screen with 2 Hf Horns on top. This picture is from the cinerama dome in L.A." I saw 2 films in Cinerama in the 50"s". We had 1300 seater at the old Imperial which was a Cinerama in those days. The sound was incredible ,not doctored like today`s cinema`s. I have Altec Duplex at home I prefer them to JBL or TAD components .I use them for stereo music only.I don't have a home theatre . I still prefer going to AMC and watch a movie there.THere are not enough dvd in HD or Blue Ray yet. Dolby has come a long way but I don't think it will replace the sound tracks of a 70 mm Projector.What I would like to see is multiplexes with at least one 70mm theatre and Altec A2`s .This is now possible with Simplex and their dual 70mm 35mm projectors.I know Hollywood wan'ts to standerdize all these formats into one for economical reasons, I think there is a huge market for 70mm theatres in big cities. The experience cannot be duplicated on anny other format.Take for example helicopter shots : only the big movie screen can reproduce the feeling and such spectacular views. http://www.widescreenmuseum.com/widescreen/htwwwsound.htm ........................................................

Hi,Garyrc For large cities we were fortunate to get 2 brand new 70 mm equiped theatre in mid 60's early 70's .It was called place du Canada In Montreal and Wesmount Square. The sound was out of this world. Films like the sound of music etc... It was a great place and relaxing place to watch a movie. Both theatre were equiped with 70mm and 35 mm and A2 speakers and Altec surround.That's why we were fortunate to see great movies there untill 1989 and later into late 1990's when both were closed . The 70mm projectors are now at the Imperial which is an old restored palace. see below Imperial theatre Do you want to know what's behind the curtain at Radio City Music Hall?

Hi, Colterphoto It's possible since this movie was a one time thing installations was rentall. I saw the movie in a small city of 100 K in a cine plex in a shopping centre. They had 2 JBL rear horn loaded speakers in the back on the floor. Perhaps larger cities had the real subs in a few large theatre. This was 1974 the projectionist at the time did not talk much about it the movie lasted only 4 weeks.if I remember.

Hi Garyrc I'm not familiar with west coast cinema's . One thing for sure when 70mm projectors Todd-A-Eo projectors were used untill mid 80"s . The Altec A2 speakers were used because of the sheer size of the theatre.We did post production film translation and new releases using these speakers untill same period.

Hi. There was a film in 1974 called Earthquake were 2 subs had to be added to the theatre showing this film. The film came in different versions as always. Some cinema's had to install 2 bass horn cabinet in the rear for lack of space behind the screen. Since this was temporarry also. Please read review. The 1974 theatrical release used "Sensurround", a subwoofer system to create the feeling of an earthquake. This was simply a set of large subwoofers designed to create infra-bass (felt but not heard). Premiered on U.S. television in 1976, with additional footage and storylines added to lengthen the film in order to expand it over a two-night showing. The latest Universal Home Video DVD (released May 9, 2006) features the original "Sensurround" audio track, duplicating the original theatrical "Sensurround" track, which generated low frequency, high-power sound waves which "shook" the theatre. On an episode of Quantum Leap, Sam Beckett leaped in as one of the stuntmen on the film (footage from which was used). "Sam" is the man hanging from a piece of debris whom Sam Royce (Lorne Greene</a>'s character) attempts to save, but loses his grip and falls. .................................................

The 210 was ment to work with wings. This brings the frequency down to 40 Hz otherwise 80 Hz and provides additional bracing for strenght.

Hi, Do you have a lawyer? The master tapes are only reserved for TV commercial making, film productions and TVsit coms. (example) A small production with 3 million viewers will run you 40,000$ for one song.And we are talking here top 40 artists of the 70's. A CD version of the same song 10,000$ So you can see that it is really not available to the public at large. And that is why they are cracking down on free mp3 loaders also. I hope i have provided some clarification to your question. ........................................................

Hi, The anwser to your question is yes. Anny good sound technician can draw a schematic on a sheet of paper using an existing passive XO. The problem with this forum and I don't want to sound condescending. There are not enough professionals implicated in these discussions.

Hi, The engineer is right ,it's more of an art than a science. The easy way out is to go active instead of passive. Theres a group of technicians that have designed upgradre passive XO for klipsch. Here is their web site. http://alkeng.com/es_xo.html ........................................................

I'm suprised no body mentioned MONSTER CABLE. Here is a quote from TODD WHITE from Altec Lansing. Monster Cable is nothing but Litz wire. Litz wire has NEVER been proven, as far as I have ever known, to be superior to properly manufactured high-quality strnaded/twisted pair wire of the same guage. It's all verrrrry subjective - just beware people who try to sell you "special sound wire." They call it "Litz" wire because it was designed by a German. The actual word is "Litzendraht" which means "woven wire." Generally defined, it is a wire constructed of individual film insulated wires bunched or braided together in a uniform pattern of twists and length of lay. The multistrand configuration minimizes the power losses otherwise encountered in a solid conductor due to the "skin effect", or the tendency of radio frequency current to be concentrated at the surface of the conductor. In order to counteract this effect, it is necessary to increase the amount of surface area without appreciably increasing the size of the conductor. It is also essential to position each individual strand in the Litz construction in a uniform pattern moving from the center to the outside and back in a given length. Even properly constructed Litz wires will exhibit some skin effect due to the limitations of stranding. Wires intended for higher frequency ranges require more strands of a finer gauge size than Litz wires of equal cross sectional area but composed of fewer and larger strands. Polyurethane is the film most often used for insulating individual strands because of its low electrical losses and its solderability. Other insulations can also be used. Litz wires are generally further insulated with a single or double wrap or serving, of a textile-typically nylon-but are also available unserved. The biggest problem with Litz wire for audiophile use is that it doesn't really help in the 20Hz - 20kHz band. What DOES help is the larger gauge... I don't like solid stranded wire for audio use, as it is easier to break, especially at the terminals, but lots of people do. I'd just keep what I have, if i were you... [ June 27, 2004 09:13 PM: Message edited by: Todd W. White

Hi It all depends on the size of the room and the attendance.Personnaly the best X Mass parties i've attended were with a high powered Fm Radio station 300,000 Watts . . The speakers were professional Studio Monitors. The DJ was the best. They new what sound was all about. Big Studio Monitors and sub woofers in stereo with that. Loud is beautiful when it's clean.

HI I don't know about AH but has anny one heard about the Mcintosh digital to analogue converter. The CD signal from their cd player is sent in digital form through a coax cable to a seperate converter.The specs look good. According to Mcintosh it makes it a better sampler. http://www.mcintoshlabs.com/mcprod/shopdisplayproducts.asp?id=19&cat=Sources&prodid=1016&product=MDA1000

George Augspurger wrote an article on this subject. With scientific calculations. Here is what his conclusion was. "used an 8-ohm loudspeaker with a d.c. resistance of 6 ohms to prepare the chart. The exact figures are not particularly significant - the point is that the resistance of the speaker voice coil is the limiting factor. Amplifier R (ohms)< td> Amplifier DF Actual Over-All DF 8 1 0.57 4 2 0.80 2 4 1 1 8 1.14 0.5 16 1.23 0.25 32 1.28 0.125 64 1.30 0.05 160 1.32 0.025 320 1.33 0.0125 640 1.33 0.0000 8 1.33 Table 1: The actual damping factor (with loudspeaker connected) is limited by the speaker voice-coil resistance. Figures are for 8-ohm output terminals to which speaker having nominal 8-ohm impedance and 6-ohm voice-coil resistance is connected. Note that changing the amplifier damping factor from unity to 8 makes a substantial change in the actual damping factor, though it is not a 1:8 change but a 1:2 change. But changing the damping factor from 8 to 16 makes very little difference in the actual damping factor, and anything more than 16 has very little effect indeed. If we increase the damping factor from 16 to 160, the change is effectively less than 10%, not 10 or one.

These are A_5.

FOR PICTURE PURPOSE ONLY.

WHEN WAS THE LAST TIME YOU SAW A GREAT ROOM FOR A GREAT SPEAKER

Hollywood had Altec A10 THX certified in 1989.

Sony CDP-D11 Professional Rackmount CD Player google_ad_client = "pub-9199590482707901"; google_alternate_color = "FFFFFF"; google_ad_width = 336; google_ad_height = 280; google_ad_format = "336x280_as"; google_ad_type = "text"; google_ad_channel ="1453359089"; google_color_border = "000000"; google_color_bg = "000000"; google_color_link = "66CCFF"; google_color_url = "CCCCCC"; google_color_text = "FFFFFF"; //--> The Sony CDP-D11 is the world's first 1U rackmounting CD player. It is designed for commercial & professional applications, such as recording studios, theatres and A/V presentations. The up-to-date design features include instant start of tracks, a wired remote, RS-232C & programmable parallel remote control. Audio outputs are both on balanced XLR and phono connectors. Coaxial & optical digital outputs are provided. Superb audio performance is guaranteed thanks to the High Density linear Digital to Analogue converters. A special "fader play" mode is provided on the parallel interface to automatically play tracks in order as the fader start switch is opened and closed. The slot-in loading mechanism (adapted from the top-of-the-range CDX-880R in-car unit) is designed for high reliability & shock resistance, and a 3 second Advanced ESP anti-shock memory is also standard.

Hi. They are discontinued. With the advent of satellite radio there might be a come back. I found a Denon with unbalanced inputs. Price 1000$.

HI Have you considered steep slope XO. Here is the web site they are made for klipsch. Extreme-slope networks separate the sound into frequency bands appropriate to each of the drivers (Woofer, squawker or tweeter) and sends them ONLY to that driver. There is only a very small overlap where two drivers are sounding together and can interact with each other. Eliminating driver interaction eliminates the need for "time alignment" resulting in a much wider "sweet spot", a noticeably better stereo image and a smoother frequency response throughout the room. http://alkeng.com/es_xo.html

MODEL 828 FOR A5 AND A7 IN 70'S .

In the 60's both the A5 and A7 had the same number 825 the dimensions of these cabinets are different and so are the low and high frequency horns. In the 70's the number changed to 828 for both models. I should know i used both models for shows and the HIGH F horns on the A5 were in seperate specially made boxes by ALTEC wich you don't have in your ALTEC green bynder.

Good Idea, It's up to the major thatre chain to at least give it a try.They have nothing to loose and a lot to gain especially with the baby boomer generation. BERT

I THINK YOU HAVE YOUR DATA WRONG. HERE IS A PICTURE OF AN A5 IN EARLY 1980 AND IT SAYS AND I CAN READ 828 NOT 825 final END OF DISCUSSION.