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Author Topic: Surround channel for drive-ins?
Jack Ondracek
Film God

Posts: 2348
From: Port Orchard, WA, USA
Registered: Oct 2002


 - posted 08-06-2006 02:32 PM      Profile for Jack Ondracek   Author's Homepage   Email Jack Ondracek   Send New Private Message       Edit/Delete Post 
Good questions, Frank.

I monitor all of my audio right off-the-air. Matter of fact, my booth doesn't have a line monitor, yet. We also screen shows in all 3 fields (occasionally), so I can evaluate how it sounds in something less open (and more quiet) than a booth.

Your FM may not work below 50hZ, but my system will pass most everything above DC. Granted, mixing a little of the sub may not make or break the evening for the majority out here... but for those who have the good stuff, I'm sending 'em what I can.

On dynamic range: I've had wideband comp/limiters, Smart Afterburners and Behringer 6-band processors here at one time or another. All have their own set of artifacts that I don't care much for. At this point, I'm pretty much getting what I want out of the Broadcast Warehouse DSPExtra processor. It's pretty spendy, but can (easily) be tuned for pretty much anything. We use separate presets, selected by the computer, to process our pre-show and film audio. The film gets much less aggressive treatment, while keeping the dynamic range reined in, and managing that darned 75ms pre-emphasis curve. When we're running music, we compare favorably with most Seattle stations and their $14k processors, so there's none of that rationalizing that the audio's not so good because "we're at a drive-in".

Hope I'm around long enough to see some after-market HD radio stuff come out... and some real numbers "in the cars". That would be fun to play with.

 -

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Louis Bornwasser
Film God

Posts: 4441
From: prospect ky usa
Registered: Mar 2005


 - posted 08-06-2006 03:48 PM      Profile for Louis Bornwasser   Author's Homepage   Email Louis Bornwasser   Send New Private Message       Edit/Delete Post 
Actually remixing anything other than discrete digital channels will drive the FM Multiplex system crazy since it is also a phase-related matrix.

If you run phase-related material (Dolby Stereo) it is best to acquire it as LtRt, not off the output of a processor where some phase rotation has already occurred. Azimuth is actually MORE touchy than in indoor theatres.

As for response, FM is quite happy to play at 100% modulation from about 10hz up. There is, however, a filter at 15.5Khz to keep hf transients out of the 19Khz pilot tone. (A practice that I do not agree with since not much high level hf is normally present.) I have removed that filter experimentally in several stations and experienced reduced hf distortion.

Jack, I can tell you are having fun....must visit you just "once before I die." Louis

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Chris Erwin
Expert Film Handler

Posts: 195
From: Olive Hill,KY
Registered: Oct 1999


 - posted 08-10-2006 10:52 AM      Profile for Chris Erwin   Email Chris Erwin   Send New Private Message       Edit/Delete Post 
Jack,

The 9024's are out?

If I had the money...
Omina FM (FM3 would be ok)
or a used 8100 Optimod.

Set of Belar Mod Meters.
Rant on: Damn the Commish and run 19% pilot injection and 130% Modulation like all these other highly processed stations in the land! [evil] LOUD!! LOUD!! LOUD!! Who cares if it spatters...we're louder than the next guy!! Rant off.

Nah, I like to keep the D/I on the conservitive side on processing. A cut in the lower bass, mids in the middle of the road and a crisp high for dialogue. An attack to make the KABOOMS and explosions from over modulation and a compressor that doesn't give hiss or acts too slow.

I tailored the sound for film and my non-sync is not as loud and punchy as the local CC cluster but clean and clear was my objective.

Air Chain:ASR-40 to Smart 2 DIT, Smart feeds Autocomm for AM and Field and 9024 feeds BW TX-1.

What would really be fun? RDS at the Drive-In! Scroll Snack Bar ads and Drive-In name!

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Jack Ondracek
Film God

Posts: 2348
From: Port Orchard, WA, USA
Registered: Oct 2002


 - posted 08-10-2006 11:28 AM      Profile for Jack Ondracek   Author's Homepage   Email Jack Ondracek   Send New Private Message       Edit/Delete Post 
Chris:

Yes, the 9024 has been discontinued , a couple of years ago, I think. It may have been too difficult for most to get sounding right. For a "digital" processor, it had a lot of the pumping effects of an analog compressor that were hard to get out, if you didn't spend the time to get to know it. Still a pretty good box for the money though.

The DSPExtra was built to compete with the Omnia and Orban processors. The other boxes (for the extra $$$$) may be a little better at keeping the clipping artifacts down on really heavily processed stations (yuck)... but if you don't need that kind of "wall of sound", this processor will do just about anything.

I'm with you on keeping the film audio conservatively processed. I like those big booms, too!

RDS is available, if you have an extra $800 or so to spend (and a spare computer laying around). Scrolling snack bar stuff is a cool idea!... maybe even upcoming shows?

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