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Author Topic: Loud projection booths could damage hearing Daryl C. W. O'Shea Film God Posts: 3977 From: Midland Ontario Canada (where Panavision & IMAX lenses come from) Registered: Jun 2002 posted 02-27-2003 05:59 PM                        Attach a drop ceiling to the metal ceiling. It doesn't have to be that much lower. Only a few inches -- just enough to get the tiles in without breaking them. The best tiles to use would be the sound absorbant ones. They're about an inch and a half thick and have insulation on the back (top) of them. Avoid using 'solid' tiles. Even the thin 'flexible' tiles would be better than 'solid' ones.  |  IP: Logged Michael Rourke Expert Film Handler Posts: 159 From: San Luis Obispo, Central Coast of CA Registered: Feb 2002 posted 02-27-2003 06:14 PM                     The 4 plex theater I work at has 4 seperate booths, so no one ever spends too much time in them when the film is running and I actually want to take out the filthy, oil soaked carpet (Simplexes) but I worry that the noise leakage into the auditorium would be too much to ignore. The port glass is a thin piece of glass slid into two runners. The booths are small enough that I could add the acoustic wall tiles, but would rubber anti-stat mats deaden the noise at all? We also have a problem with static in these small booths and I hope that replacing the carpent with anti static mats will help.  |  IP: Logged Steve Kraus Film God Posts: 4094 From: Chicago, IL, USA Registered: May 2000 posted 02-27-2003 06:17 PM                    Daryl, can you recommend any sources stateside for the compressed fiberglass with facing? The post house I used to work at used it in their 3 screening rooms but I wasn't there when it was installed. I don't know if it's a good idea to paint them as that's bound to affect the acoustical properties.  |  IP: Logged Gordon Bachlund Jedi Master Film Handler Posts: 696 From: Monrovia, CA, USA Registered: Aug 1999 posted 02-27-2003 06:21 PM                        This thread has been fun to watch, especially for one like me who remembers the booths of fifty plus years ago, some of which had steel-clad walls, floors and ceilings, and most of which had battleship linoleum floors and hard concrete walls and ceilings. Perhaps this was part of the motivation to keep booth equipment well maintained and lubricated.  |  IP: Logged Paul G. Thompson The Weenie Man Posts: 4718 From: Mount Vernon WA USA Registered: Nov 2000 posted 02-27-2003 07:30 PM                     Randy, you hit that on the nose when you described the ringing in the ears sound. That's one of the reasons I like to have some kind of steady noise when I am in a quiet room to drown out the ringing, especially when trying to sleep. That ringing noise drives me nuts! (Of course, I am probably half-nuts anyway)  |  IP: Logged Martin Brooks Jedi Master Film Handler Posts: 900 From: Forest Hills, NY, USA Registered: May 2002 posted 02-27-2003 09:14 PM                        Here's a chart of the maximum exposure times in Hours/Minutes/Seconds beyond which OSHA considers hearing damage to take place. (DB, A-Weighted) SPL Time HH:MM:SS 80 25:24:00 81 20:10:00 82 16:00:00 83 12:42:00 84 10:05:00 85 8:00:00 86 6:21:00 87 5:02:00 88 4:00:00 89 3:10:00 90 2:31:00 91 2:00:00 92 1:35:00 93 1:16:00 94 1:00:00 95 0:47:37 96 0:37:48 97 0:30:00 98 0:23:48 99 0:18:59 100 0:15:00 101 0:11:54 102 0:09:27 103 0:07:30 104 0:05:57 105 0:04:43 106 0:03:45 107 0:02:59 108 0:02:22 109 0:01:53 110 0:01:29 111 0:01:11 112 0:00:56 113 0:00:45 114 0:00:35 115 0:00:28 116 0:00:22 117 0:00:18 118 0:00:14 119 0:00:11 120 0:00:09 121 0:00:07 122 0:00:06 123 0:00:04 124 0:00:03 125 0:00:03 126 0:00:02 127 0:00:01 128 0:00:01 129 0:00:01 130 and > 0:00:00  |  IP: Logged Daryl C. W. O'Shea Film God Posts: 3977 From: Midland Ontario Canada (where Panavision & IMAX lenses come from) Registered: Jun 2002 posted 02-27-2003 09:28 PM                        Steve, I'll see if I can find out where we've been purchasing the panels. Roger's out on tour right now so it might be a few weeks. As long as it is a light painting with a roller, we've found it doesn't make much of a difference in a larger room. It also looks a heck of a lot better than the stock off-white colour.  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 02-27-2003 10:08 PM                     Be aware that in most locations TBAR ceiling create a pleum and as such the tiles must be fire rated and cliped in place  |  IP: Logged Kara J. McVay Film Handler Posts: 95 From: Delaware, OH Registered: May 2002 posted 02-27-2003 10:27 PM                        I am sitting here right now with that lousy ringing in my ears. I have to fall asleep with the TV on, so it masks the ringing.  |  IP: Logged William Hooper Phenomenal Film Handler Posts: 1879 From: Mobile, AL USA Registered: Jun 99 posted 02-28-2003 02:17 AM                        quote: The best tiles to use would be the sound absorbant ones. They're about an inch and a half thick and have insulation on the back (top) of them. Avoid using 'solid' tiles. Even the thin 'flexible' tiles would be better than 'solid' ones. Some of those acoustic tiles deteriorate like mad after a year or so. The ones that have the texture of a thin coating of dry plaster on the lower side seem to be the worst: a film of white dust on all surfaces, a plaster-y taste in the area, & evidence of respiratory irritation in personal air filters everywhere (with white, instead of black dust in the filters). The HVAC unit filters clog up with the white stuff too. It's not neccessary to cover ALL the wall with Sonex or a Sonex-like material. Typically in studios, only above chair rail height is sufficient. For noise abatement only, simply spaced panels or ones in effective locations is sufficient. You'll find a lot of guys who do field recording take a few sections of Sonex mounted on 3'x5' or so panels with attached easel-type props around with them & get sufficient to excellent reverberation control or isolation. As for dust, Sonex with the varying horizontal & vertical ridge patterns does collect it. It's mostly on the horizontal surfaces. There are Sonex knock-offs with ridges that run only one way, & if installed vertically, they are not dust collectors. [ 02-28-2003, 03:24 AM: Message edited by: William Hooper ]  |  IP: Logged Daryl C. W. O'Shea Film God Posts: 3977 From: Midland Ontario Canada (where Panavision & IMAX lenses come from) Registered: Jun 2002 posted 02-28-2003 02:33 AM                        Plaster coated tiles are what I avoid. I was referring to the plastic coated ones with the yellow insulation on the top. They do not flake apart at all. [ 02-28-2003, 12:00 PM: Message edited by: Daryl C. W. O'Shea ]  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 02-28-2003 07:28 AM                     Sonex is highly flamable as some IMAX projectionists at the 3M dome discovered many years ago when the remains of an exploded lamp breached the base plate and ignited the sonex that they had lined the lower compartment of the projector with to quieten the beast We used to have sheets of Sonex hanging in several places and got told to remove them as they did not have a suficient verticle flame rating for a"electrical room"  |  IP: Logged Steve Kraus Film God Posts: 4094 From: Chicago, IL, USA Registered: May 2000 posted 03-01-2003 12:32 AM                    After the recent Rhode Island tragedy I would not want any sort of foam unless I had personally put a match to a sample to see what it did, but given the propensity to collect dust I pretty much ruled that stuff out anyway.  |  IP: Logged Joe Redifer You need a beating today Posts: 12859 From: Denver, Colorado Registered: May 99 posted 03-01-2003 01:10 AM                        I thought my booth was noisy, being only 125' long and 12' wide with tile floor, cinderblock walls, drop ceiling and 6 noisy Simplexes ticking away. But the average level is 73dbc and it peaks at 82dbc right between two projectors that are back to back. I was absolutely amazed that it is so "quiet". I was hoping to force my employer to install carpet but no such luck. Maybe they will carpet the booth for my birthday or something. I always have a slight ringing in my ears that I can hear during absolute silence if I listen for it. I've had that my entire life and have been told that it really is nothing to worry about. It is not disturbing. I can still hear the whine of a TV when it is on, and I can tell if a TV or monitor is on or off just by listening for that whine. My Linksys router emits a fairly loud whining/ringing sound. Weird! Like it was mentioned somewhere above, I do occasionally experience a louder ringing that gets pretty loud for a few seconds and then goes away for no reason. This has also happened my entire life. It happens maybe once every few months. Doesn't seem to have any ill effects but what the hell do I know?  |  IP: Logged Steve Kraus Film God Posts: 4094 From: Chicago, IL, USA Registered: May 2000 posted 03-01-2003 11:08 AM                    TV horizontal whine (NTSC), off the flyback xformer or CRT yoke, is ~15,734 Hz. As for the ringing in Joe's head, well, it's slowing driving him crazy. OK, not slowly.  |  IP: Logged

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