my profile | my password | search | faq & rules | forum home

» Film-Tech Forum ARCHIVE   » Community   » The Afterlife   » Why is the general public so enamored with BOSE? (Page 5)

This topic comprises 5 pages: 1  2  3  4  5

Author Topic: Why is the general public so enamored with BOSE? Sean McKinnon Phenomenal Film Handler Posts: 1712 From: Peabody Massachusetts Registered: Sep 2000 posted 02-02-2008 10:22 AM                        Thank You Steve for that great information! It's very clear to me now.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 02-02-2008 05:16 PM                     quote: Steve Guttag They have mating plugs too! Now this is on the absurdity of it all. How about the wire to the breaker panel...or the breaker panel, or the transformer that feeds the breaker panel....etc. At the voltages/current in this application...I don't think Gold is significantly adding to the power transfer. Well for what its worth... the huge electromagnets used in seperating U-235 during the Manhattan project were wound from solid silver banding... literally millions of troy ounces of solid silver. This was not because Oppenheimer thought the magnets would sound better made from silver but because thats all the metal that was left in the USA to make them at the time... there was still a huge deposit of Silver in Fort Knox. All other presious metals were more or less depleted... especially copper.... Shows just how desperate we were to develop the Atom Bomb before anyone else!! Steve is absolutely correct about Gold connectors! I normally won't use a product that doesn't have them!!! They also don't cost a ton more than the cheap stuff.... Mark  |  IP: Logged John Hawkinson Film God Posts: 2273 From: Cambridge, MA, USA Registered: Feb 2002 posted 02-02-2008 09:24 PM                     What Robert said about skin effect -- stranded isn't appreciable better, you need to go to Litz wire, which is out-of-this-world expensive. Steve G. said, "No on stranded wire for HF applications (say HDSDI video cables for DCinema...Belden 1694A is the standard and it is 18awg Solid core)." OK, I have two questions, probably both of them dumb: 1) Have you actually had problems with HDSDI with stranded wires? I would think you'd still follow the general guidelines of stranded for short patch-cords and solid for long pulls. 2) DCinema uses HDSDI? I (obviously) haven't been paying attention, but I thought DCinema was very concerned about copy protection and that there was no copy protection on SDI. (As an aside, I had my first HDSDI experience with HDCAM-SR recently and I was rather blown away by Sony's horrible UI that involved rebooting the deck when you changed the frame rate. *cough* ) --jhawk  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 02-03-2008 08:06 AM                     God John...what a dumb set of questions But seriously. It is all in the resistive/reactive numbers that determine a cable's suitability to an application. It isn't that stranded wire CAN'T be used...it is that it normally has significantly higher attenuation at higher frequencies. So, if you are going to run a cable for say a foot or 3-feet...damn near anything will work. If you want to get that 300-foot run to work with HDSDI you best have proper RG-6 cable like 1694A. Look at a cable's specs. Also to note to a previous poster's comments on RG-59...it is available in many forms, included stranded, mini...etc...but it is also available in solid form like Belden 1505A (note 1505F is one of the stranded forms from Belden). But again...look at the specs of those various cables to see how it is going to treat the signal. Get a 100' length of cable and inject a known signal...look at it with a scope on the other end (properly terminated) and see what comes out...on any given class...the solid is going to win. Patch cables are almost always stranded cable due to their nature (short, and handled a bunch). The bigger concern in a patch bay system isn't so much the stranded cable is the quality of the connections. The impedance should match on all of the connection points. If not, you are going to get attenuation and reflections that will degrade the signal. Yes, HD-SDI is the means of moving DCinema video. Dual-link for the current stuff in 2K. The 4K stuff needs 8 such cables! Not to worry about copy protection. At no point is the signal not encrypted outside of the projector. The DCinema projector has something called "Link Decryption". Thus the projector is the last stage of copy protection for DCinema. You can't hook up your super-duper Sony HDSDI monitor to a DCinema line and see anything. But a nice thing about ahearing to established standards is that HDSDI routers/repeaters will still work to move the signals around. Steve  |  IP: Logged Robert Minichino Master Film Handler Posts: 350 From: Haskell, NJ, USA Registered: Dec 2005 posted 02-03-2008 09:57 AM                        quote: Steve Guttag It isn't that stranded wire CAN'T be used...it is that it normally has significantly higher attenuation at higher frequencies. No argument there. But where flexibility is vital a short length of stranded core coax has a lot less attenuation than a piece of broken solid core. I'll second the importance of good, correct connectors. It's not fun troubleshooting high BER on a DS3 and finding out some fine technician used a 50 ohm BNC because he "ran out" of 75 ohm.  |  IP: Logged

All times are Central (GMT -6:00)

This topic comprises 5 pages: 1  2  3  4  5

Printer-friendly view of this topic

Hop To: Select a Forum: Category: Operations -------------------- Digital Cinema Forum Film Handlers' Forum Large Format Forum Ground Level Feature Info, Trailer Attachments & REAL Credit Offsets Category: Community -------------------- Film-Yak Film Handlers' Movie Reviews The Afterlife Bob Maar's Joke-A-Thon Category: Classified -------------------- Equipment and Supplies Wanted/For Sale Help Wanted/Seeking Employment Category: System -------------------- Software Beta Testing Forum

The Film-Tech Forums are designed for various members related to the cinema industry to express their opinions, viewpoints and testimonials on various products, services and events based upon speculation, personal knowledge and factual information through use, therefore all views represented here allow no liability upon the publishers of this web site and the owners of said views assume no liability for any ill will resulting from these postings. The posts made here are for educational as well as entertainment purposes and as such anyone viewing this portion of the website must accept these views as statements of the author of that opinion and agrees to release the authors from any and all liability.