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Author
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Topic: Crossovers in Booth Monitors
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Antonio Marcheselli
Phenomenal Film Handler
Posts: 1260
From: Florence, Italy
Registered: Mar 2000
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posted 08-27-2002 05:11 PM
Steve,My compliments too! A wonderful job! A question: is it a three amped system? If so, are the first three amps a three channel ones? If yes, I didn't know that they exist. Just for my curiosity, how big is the theater where you installed that rack? Bye
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Antonio Marcheselli
Florence, Italy
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Steve Guttag
We forgot the crackers Gromit!!!
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 08-27-2002 06:33 PM
Brad,Were you referring to my links? If so, they are all to pages, not pictures. Antonio, Those amps were QSC 4-channel amps. Channels 1 and 2 were bridged mono to feed the LF section. Channel 3 feeds the MF section and Channel 4 feeds the HF section. Thus you can put the power where you need it. The theatre has a screen about 40-feet wide and the theatre is about 65 feet deep. Steve ------------------
"Old projectionists never die, they just changeover!"
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Steve Guttag
We forgot the crackers Gromit!!!
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 08-27-2002 10:16 PM
I should note that those of you that haven't read a RANE manual (any of their manuals)...you really should. For the "techno-weenie" they are a hoot! As a for instance...most manuals will identify each connector and control on a unit...Rane is no exception. On the AC23 (3-way crossover) manual...when it comes to the power switch...the description is "two guesses" The manuals are available for download from the site. There is also some very good general information contianed in their manuals and technical notes. Rane also has the infamous PI-14 Psudoacoustic Infector...I suggest you all look it up to see this company has a sense of humor. http://www.rane.com/pdf/old/pi14dat.pdf Steve ------------------
"Old projectionists never die, they just changeover!"
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Steve Guttag
We forgot the crackers Gromit!!!
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 12-02-2002 12:56 AM
Ok...just for completeness...below are pictures of DSP based crossovers. These units are by RANE (RPM-26V) which are 2-in 6-out units so they will do stereo 3-way systems...as in this case.
With DSP crossovers, you tend to get quite a bit of processing without paying too big a noise hit.
For instance, in this system, the RPM-26V has the above mentioned 3-way crossover (with independantly selectable crossover points, styles and slopes for each section), delays on each section (if needed) and up to 13 parametric equalizers! Of which they too are programable so that you can turn some in to bass and treble filters or a CD horn equalizer (and set the filter to exactly match the horn you are using). With one of these, you can effectively bypass the equalizer in the cinema processor and achieve a flat response and not pay all the time-domain hit like if you had to do it all in the 1/3-octave world. This is not to say that 1/3-Octave isn't better in some cases but with parametrics, you can often achieve a flat response with only 5 or so filters...depending on the speaker system and room.
The big disadvantage is...ITS DIGITAL. From a reliability standpoint, analog crossovers will never "forget" their settings (though they can get noisy with cold connections or pots). One also must watch their levels and place the dynamic range of the sound within the capabilities of the DSP (you cant allow it to clip). However, you want to get as much signal in there to keep the "resolution" of the digital signal as high as possible for the best performance.
So DSP crossovers are not for the faint of heart or the casual installer but they are almost a must for dealing with "difficult" speakers. I have found that the inexpensive 3-way systems seem to need lots of help (if you didn't spend more than $2000 a speaker, you have an inexpensive 3-way) and the DSP crossovers can make the difference on these speakers. It is not small wonder that those speaker companies that make these inexpensive 3-ways all seem to have their own DSP crossovers to mate up with them.
The front of the units:
The rear of the units:
Perhaps I should do a review of the RANE crossovers someday. I like them a bunch.
Steve
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I'll be fine now. Continue discussing audio equipment.
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Maybe someone at Century Theaters should take notice!
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. I think he's from the Planet Ribbon Cable. I personally won't turn out crappy work like that or use the stuff ![[Roll Eyes]](rolleyes.gif)
and still prefer to hard wire like yous guys do. Someone at CLACO has to maintain high standards.
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