8mm Forum: Sound Proofing Projection Booth

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Topic: Sound Proofing Projection Booth

Ernie Zahn
Jedi Master Film Handler

Posts: 540
From: Greenwich, CT, USA
Registered: Oct 2004

posted June 26, 2013 04:15 PM

My home theater room has a perfect little alcove dead center facing the screen on the other side of the room. It measures about 7.5' high, 3' wide, 3' deep. Perfect for a projection booth.

My plan is to install a door in front of it and make it an enclose projection booth.

I've already figured out sound proofing for the walls and the door but I'm worried that whatever I use for glass will make my efforts all for not.

Anyone else have an isolated booth? What did you do for glass? I wanted to go cheap and get plexi glass or something but I wasn't sure. I also have a connection to get a variety of framing glass.

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Check out the trailer for my feature length Spaghetti-style Western:

Six and Bisti

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Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003

posted June 26, 2013 05:31 PM

Hi Ernie,

There's an experiment you might want to try before you build a soundproof booth. Find a set of headphones and plug them into your machines' phone jacks and listen to the audio isolated from the projector sounds. (-or use an external speaker in a seperate room and close the door.)

Particularly Super-8 machines are vulnerable to chatter in the tracks due to the intermittant motion of the film through the gate getting through to the film passing over the sound heads, where the motion should be very smooth.

This makes a sound in the playback which sounds like the claw moving the film through the gate, but the sound of the projector tends to mask it.

-then somebody puts the machine in a soundproof enclosure with external speakers and there's nothing to cover it anymore...

The problem was always there, it's just obvious now!

This effect can be better or worse, in the best cases not noticeable at all. Some designs are better able to supress this than others, and I've seen one that was pretty bad cleaned up by replacement of some worn guides around the heads.

It's just good to understand it going in.

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All I ask is a wide screen and a projector to light her by...

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Ernie Zahn
Jedi Master Film Handler

Posts: 540
From: Greenwich, CT, USA
Registered: Oct 2004

posted June 27, 2013 09:01 AM

I just tested this out on a few reels of varying age.

I used noise canceling headphones. I didn't seem to notice any issue if it's there then it's very subtle.

I also recorded the audio from one reel and played it back on my computer and didn't notice it.

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Check out the trailer for my feature length Spaghetti-style Western:

Six and Bisti

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Maurice Leakey
Film God

Posts: 5895
From: Bristol. United Kingdom
Registered: Oct 2007

posted June 27, 2013 10:18 AM

You're going to get warm in there.

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Maurice

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Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003

posted June 27, 2013 11:13 AM

"Sounds" fine!

I just didn't want you discovering a problem with this after you built your booth.

I initially found it years ago when I decided, at least for special occasions I would back the machines through the porch doors and put a speaker up at the screen. I discovered the chattering immediately and also figured out the 25-30 foot throw involved made for a long commute when it came to changes of reels, volume and focus.

If I ever build a booth for myslef, something I'll consider is most of the time I'm the projectionist and the entire audience too, so the machines need to be close enough and accessible enough to where I watch that I'm not tempted to leave it blurry and loud when it's been a long day.

(I have speakers by the screen now, and the chattering is at least under control.)

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All I ask is a wide screen and a projector to light her by...

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