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Author Topic: "It's Complicated"Sound Level John Hawkinson Film God Posts: 2273 From: Cambridge, MA, USA Registered: Feb 2002 posted 12-26-2009 09:26 AM                     OK, John, it's really that John Toll, ASC knows projectionists will do their job. --jhawk  |  IP: Logged Ken Lackner Phenomenal Film Handler Posts: 1907 From: Atlanta, GA, USA Registered: Sep 2001 posted 12-26-2009 11:50 PM                     Steve, I don't quite understand. If you set the fader to 7.0, run pink noise, and set the level so that your SPL meter reads 85dB, how can it be said that this 7.0 is louder than 7.0 on any other processor?  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 12-27-2009 12:17 AM                     Steve is saying that the internal level of the pink noise in the 650 is lower than their legacy processors, thus making the final output louder. Sony did a similar thing with SDDS. Their pink noise was high frequency deficient, making their tracks extra bright (and harsh).  |  IP: Logged Greg Haas Film Handler Posts: 18 From: Buffalo, WY, USA Registered: Aug 2003 posted 12-28-2009 11:46 AM                        All set at 7. Now...opening sound cabinet...reaching for gain knobs on amp.... Ahhh...perfect! pffft!  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 12-28-2009 12:45 PM                     Way to screw up your system Greg. Then again if you have to do that, I guess it wasn't setup/designed properly in the first place.  |  IP: Logged Greg Haas Film Handler Posts: 18 From: Buffalo, WY, USA Registered: Aug 2003 posted 12-28-2009 02:16 PM                        I'm kidding, Brad. Sheese.  |  IP: Logged Bruce McGee Phenomenal Film Handler Posts: 1776 From: Asheville, NC USA... Nowhere in Particular. Registered: Aug 1999 posted 12-31-2009 05:25 AM                     Does the director also tell us how to deal with incredibly loud trailers before her soft-volume feature begins? My first show of this was to a full house. LOTS of complaints about volume during the first and second trailers. Turned it down to 5.5 on my CP500. A few minutes later, after the feature started, I was called to turn the sound up. So, back it went to 6.5. No more complaints, except that the auditorium is too cold... at 70 degrees!!! We cant win.  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 01-01-2010 05:38 AM                     Thank you Steve for this useful hint.  |  IP: Logged Tom Inglis Film Handler Posts: 34 From: Croydon London, England Registered: Mar 2009 posted 01-01-2010 07:25 AM                     quote: Jim Cassedy But John, I have the little knob in MY refigerator set to "7" Mine goes up to 11. It's like 10, but 1 colder.  |  IP: Logged Matt Skilton Film Handler Posts: 43 From: Bromley, Kent, UK Registered: May 2009 posted 01-01-2010 10:38 AM                        I think some films would benefit from being played at 7 db. Gamer and Transformers 2 to name but two. Even better if the Xenon is switched off as well.  |  IP: Logged John Hawkinson Film God Posts: 2273 From: Cambridge, MA, USA Registered: Feb 2002 posted 01-01-2010 06:35 PM                     Wait-a-sec. Steve, you say, "It appears that Dolby got their calculations wrong way back on the Cat 85. The CP500 matched the legacy products but the CP650, rather than agreeing with all others, decided to "correct" a long ago mistake. The net result, the CP650 is louder on all volume setting than all legacy products." So, on the CP65, gain levels are set to 85dBC with the fader at 7. My understanding is that's true of the CP650 as well (never set one up). So no matter how different the tapers are, 85dBC is 85dBC, and both processors should produce exactly the same volume level --- when they are at 7 on the fader. (I suppose the pink noise generators are different and that might have some small effect). if the CP650's taper has a different slope, then it should either be louder above 7 and softer beneath it, or vice versa. But it shouldn't be consistently louder. Right? I guess Ken made this point and Brad says it is the PN generator (wow, way to read the thread...). Is that really what is meant here? --jhawk  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 01-01-2010 07:25 PM                     I played a organ once in a theatre i thought would sound better if the blower was turned off  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 01-01-2010 07:36 PM                     John...on the CP650...the REFERENCE level is different so 7 on a 650 set to 85dBc will play a film louder than than a CP65...it is in the pink noise reference level. The CP500 and CP650 approximate the taper of the analog VCAs by having a double knee in their algorithms. I believe the CP650's user or installation manual will show you the double slope.  |  IP: Logged

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