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Low Frequency Bandwidth Allocation in Surround Mixing

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Are there any conventions in mainstream surround-sound mixing (big Hollywood films) with regards to how low frequency bandwidth is allocated? In other words, is there any reason to NOT use the LFE channel(s) for bass frequencies and to send discrete low frequency information to the center or front channels...even to the surround/rear? My initial guess would be "no" due to the omnidirectional nature of those frequencies, but then again, you do see healthy-sized center and main channels in both professional and consumer cinema systems.

Also, are there any general guidelines that the mixing engineers follow with regard to the frequency range for the specific channels? Such as.."o.k., we general don't send anything below 75 Hz to the center channel.." etc.

I've noticed that the overwhelming majority of professional cinema systems are made by JBL, so I'm guessing the audio is mixed with those in mind?

And as I've gone ahead and asked 10 questions instead of just one ...I'll go ahead and ask one more.... are the blu ray releases the same surround mix as the theatrical releases?

Just curious..and would like to know because I'm about to drop some cash for a surround system.

(I'm an electrical engineer and hobbyist performing musician and gear enthusiast)

Thanks.

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