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Topic: Perspecta and the Academy filter.
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Steve Guttag
We forgot the crackers Gromit!!!
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Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 11-20-2013 06:49 AM
WITHOUT. If you are using a CP200, in particular, the Academy filter has to be out or the CAT109 will also filter out much of the Perspecta control tones! (A proper academy filter has both HP and LP fitlers, not just the LP filter) Since the control tones can turn on/off the channels, yes, there will be a degree of noise reduction. Note, the control tones can also determine how loud each of the three stage channels are too.
Now, the film was still mixed to the rooms of the day so it is likely to sound a bit spitty on a fully tuned room with EQ. I did a bit of research on this with 70mm even...there was a discussion I had on whether format 40 70mm film should have an academy filter on them since no such specification was ever applied to the magnetic tracks, like they were with optical. The answer is yes, by the way. The academy filter is only there to "re-eq" a room that has extended frequency response so it mimics the response of the "typical" room of the day (before EQ and extended response) In fact, a studio, when recording the magnetic tracks may even apply boost in the recording to extend the response to compensate for the theatre's response.
I was able to prove this using two identical rooms...one with a circa 1957-1965 electronics/head end and one with modern (2005) electronics complete tuning. Running the same movie (same print), if you didn't have an Academy filter in...the new system sounded VERY shrill. Once the filter was in place...it sounded rather awesome, actually...it was cleaner than the old system, natural sounding...etc. It had all of the benefits of modern electronics (lower distortion, less noise) but with the proper response. We then converted the other auditorium.
So again, in Perspecta...you'd ideally have a filter after the B-chain to have it mimic the older auditoriums. I have not studied Perspecta that much to know if the various Perspecta boxes tried to extend response any. It is likely they may have had some sound "warping" filters in there too. For its day, it was rather sophisticated. Extra HF response would likely be perceived as more High-Fidelity.
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