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Topic: Switch on JBL 8340

Antonio Marcheselli
Phenomenal Film Handler

Posts: 1260
From: Florence, Italy
Registered: Mar 2000

posted 09-27-2000 05:15 PM

Hello everyone

What is the switch locate on the JBL 8340 Surround speaker? Has two position: "Cinema surround" and "ISO [something]".

Bye
Antonio

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Gordon McLeod
Film God

Posts: 9532
From: Toronto Ontario Canada
Registered: Jun 99

posted 09-27-2000 07:43 PM

It selects wheter the speaker has a flat response or a ISO rolloff

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Russ Kress
Expert Film Handler

Posts: 202
From: Charleston, WV, USA
Registered: May 2000

posted 09-28-2000 12:40 AM

It means that either the speaker is being used as a cinema surround, or a stage monitor in a live application.

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Christos Mitsakis
Expert Film Handler

Posts: 242
From: Ag.Paraskevi, ATHENS, GREECE
Registered: Sep 1999

posted 09-28-2000 07:28 AM

ISO 2969. Its the X curve that the front speakers are equalised.

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Antonio Marcheselli
Phenomenal Film Handler

Posts: 1260
From: Florence, Italy
Registered: Mar 2000

posted 09-28-2000 12:14 PM

So In "ISO 2969" the 8340 has the same frequency response than the front channels.

And in the "cinemna surround" what changes?

Bye
Antonio

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Russ Kress
Expert Film Handler

Posts: 202
From: Charleston, WV, USA
Registered: May 2000

posted 09-30-2000 12:17 AM

"Cinema Surround" sets a roll-off similar to the ISO standard for cinema applications.

The other position is used when the speaker is used as a full range stage monitor.

In both cases, I think that the idea is to have the speaker perform naturally correct in each application with a minimum of equalization.

Early cinema processors lacked surround channel equalization, so I am assuming that this option was intended to correct for this.

Contact Lonny or Ken at Dolby Laboratories, 415-558-0200 and they can tell you everything you ever wanted to know about this!

Personally, I think that the next Dolby tee-shirt edition should bear their likenesses!

Better yet, have seperate Lonny and Ken tee- shirts! Collect the whole set! This will be bigger than Pokemon!!!

Now, where did I put Ray's number!? (LOL)

Russ

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Antonio Marcheselli
Phenomenal Film Handler

Posts: 1260
From: Florence, Italy
Registered: Mar 2000

posted 09-30-2000 03:55 AM

So, having a CP500, should this switch stay at "Cinema Surround" or "ISO 2969" position?

Bye

Antonio

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Ian Price
Phenomenal Film Handler

Posts: 1714
From: Denver, CO
Registered: Jun 99

posted 09-30-2000 01:11 PM

Cinema Surround!

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Antonio Marcheselli
Phenomenal Film Handler

Posts: 1260
From: Florence, Italy
Registered: Mar 2000

posted 09-30-2000 06:02 PM

Thanks Ian and sorry if my question was obvious...
But when I started my job for the first time I discovered that my theaters had all speakers with switch in "ISO 2969", wrong digital delay (after 5 year of installation), wrong DTS levels ("they haven't to be adjusted" said my ex tech...), wrong equalization and more...

Thanks to everyone!

Antonio

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Rick Long Jr
Expert Film Handler

Posts: 211
From: Toronto, Canada
Registered: Jul 2000

posted 10-11-2000 09:59 PM

Antonio; You asked "cinema surround OR ISO 2969". I believe if you look again it will say "cinema surround-ISO 2969" in one position and "flat-foreground music" in the other. Bottom line is ,you want Cinema surround, which is ISO 2969.

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Antonio Marcheselli
Phenomenal Film Handler

Posts: 1260
From: Florence, Italy
Registered: Mar 2000

posted 10-12-2000 05:15 AM

Rick,

I saw that switch only few times, thanks for your help!!

Antonio

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