8mm Forum: Loudspeaker Sheilding?

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Topic: Loudspeaker Sheilding?

Rob Young.
Phenomenal Film Handler

Posts: 1633
From: Cheshire, U.K.
Registered: Dec 2003

posted April 21, 2004 06:31 AM

I wonder if some of the more technical minded out there might be able to help me out with a bit of advice.

I'm just putting together a new mini-cinema set-up in it's own room and want to add a rear-centre sound channel for DVD. Unfortunately, the only place for the speaker is on a shelf just inches above the 8mm projector. The speaker is a big ****** and I wouldn't have thought it was sheilded.

I'm a bit worried about possible damage to the mag. tracks on film, as the take-up spool is very close to the speaker.

Does anyone know if this is likely, or how to introduce some sort of magnetic shielding under the speaker??? Thanks.

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John Clancy
Phenomenal Film Handler

Posts: 1954
From: Cornwall
Registered: Jun 2003

posted April 21, 2004 08:57 AM

Very unlikely the sound will disappear off the stripe. I wouldn't even consider it if it was me.

To check if the speaker is magnetically shielded stick it next to a TV and see if the colours go. If they don't then it's magnetically shielded. Just don't leave it sitting next to the TV too long otherwise there is a remote possibility some damage could be done.

--------------------
British Film Collectors Convention home page www.bfcc.biz. The site is for the whole of the film collecting hobby and not just the BFCC.

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Rob Young.
Phenomenal Film Handler

Posts: 1633
From: Cheshire, U.K.
Registered: Dec 2003

posted April 21, 2004 09:41 AM

John, if you wouldn't worry about it then neither will I!

Thanks.

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Steve Klare
Film Guy

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

posted April 21, 2004 12:20 PM

Rob,

Why not find some audiocassette which nobody wants (Barry Manilow perhaps) and set it on top of the speaker and leave it there for while you use the speaker.

If after a couple of days you play the cassette and hear nothing but white noise, then you know!

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

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Rob Young.
Phenomenal Film Handler

Posts: 1633
From: Cheshire, U.K.
Registered: Dec 2003

posted April 21, 2004 01:49 PM

...and I'll also have improved the content of the tape!!!

Actually Steve, great minds must think alike. I'm sure John is right, but as an extra precaution I had similar thoughts to you and have stuck an 8mm copy of "The Rose" under the speaker for a couple of days.

I'll let you know if this "improves" the soundtrack [Wink]

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John Whittle
Jedi Master Film Handler

Posts: 791
From: Northridge, CA USA
Registered: Jun 2003

posted April 21, 2004 09:05 PM

A simple protection would be to just put a metal plate under the speaker which will effectively keep any magnetic fields from proceeding beyond the plate.

Next week we'll talk about Faraday Cages.

John

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Rob Young.
Phenomenal Film Handler

Posts: 1633
From: Cheshire, U.K.
Registered: Dec 2003

posted April 22, 2004 05:25 AM

Thanks John. I thought about that too but didn't know if it would work [Confused]

.

Anyway, now with a metal sheet under it and that copy of "The Rose", I don't think anything will get through!

Seriously, thanks all.

All I need to do now is find a way of getting Dolby Digital EX onto that Super 8 stripe...Hmmmmnnnnnn [Wink]

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