8mm Forum: Loudspeaker Sheilding?

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Posted by Rob Young. (Member # 131) on 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.

Posted by John Clancy (Member # 49) on 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.

Posted by Rob Young. (Member # 131) on April 21, 2004, 09:41 AM:

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

Thanks.

Posted by Steve Klare (Member # 12) on 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!

Posted by Rob Young. (Member # 131) on 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]

Posted by John Whittle (Member # 22) on 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

Posted by Rob Young. (Member # 131) on 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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