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Author Topic: THX question Frank Angel Film God Posts: 5305 From: Brooklyn NY USA Registered: Dec 1999 posted 01-30-2002 01:19 AM                        In THX's packet which they sent me when I requested their specs for cinema sound systems, they have a ton of specifications for everything from noise from air conditioning ducts to adjacent theatre bleed-through, but nowhere can I find a specification as to the sound pressure level a system needs to produce in order to qualify for THX certification. Are they just assuming the Dolby standard? Seems the SPL attainable before clipping and available headroom would be essential specifications to any sound system design. They are doing a redesign of our theatre and I would like to tell the design engineers that we want them to meet or exceed THX specs if at all possible. Can't do that if THX doesn't publish specs for SPL.  |  IP: Logged John Walsh Film God Posts: 2490 From: Connecticut, USA, Earth, Milky Way Registered: Oct 1999 posted 01-30-2002 08:54 AM                     Some THX spec's relay on other spec's (like Dolby). It's like saying "Our spec is that you install the equipment according to the manufacturers instructions, or to SMPTE standards.  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 01-30-2002 09:47 AM                     The SPL spec is dependent on what you install If it was to say be a optical only facility it is different to what would a digital or a mag facility  |  IP: Logged Rory Burke Expert Film Handler Posts: 181 From: Burbank, CA, USA Registered: Jun 2000 posted 01-30-2002 09:18 PM                     The THX spec is SMPTE's spec per room volume/size and usage of analog digital etc etc....It is not a secret. Essentially the THX design will be capable of handling anything per yor apecified purpose so no need to worry about exceding as their Criteria<SMPTE's> is quite adequate. Good luck with your project and dont worry to much about the details as THX will not let you down in that department! Rory  |  IP: Logged Frank Angel Film God Posts: 5305 From: Brooklyn NY USA Registered: Dec 1999 posted 01-31-2002 01:01 PM                        Thanks guys; that's what I assumed; I just thought it was odd that THX didn't include SPL and frequency response specs given how detailed all the other specs were that they included in their packet. Unfortunately, all the monies that were earmarked for the renovation project have been put on hold because of the huge budgetary changes caused in NYC by 9/11. I think it will eventually get put back on the table, but later rather than sooner.  |  IP: Logged

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