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March 25th, 2013, 12:42 PM
#3
Senior Hostboard Member
Re: Altec 802 on Film Tech forum VOTT's
What you have to remember here is the digital difference.From the old standard 100 feet down to 40 feet.The MR 94 with 299 must be used for the digital age.
quote:
Now's the real test...Digital(103dB)
We are down to 40 feet! That is a pretty small theatre by any standards! The A-7 in the digital era is now religated to screening rooms. Does this mean that in a 60 foot long theatre the speaker will die instantly? No but it is being driven very hard and will tend to fail a bit often, depending on if your theatre sets is fader to 7 and what films you tend to run...art films arn't as taxing as whiz-bang special effects laden films.
Oh, and if you give yourself a 3-dB safety margin...you are down to about 28.5 feet! Dropping in a 909 diaphragm will get you about 57 feet without the safety margin or about 40.5 feet with the safety margin.
Your last ditch effort would be to raise the crossover point to 800Hz...that will get you about a 33% increase in power handling...so with the 909 and at 800Hz...with a 3-dB safety margin...46.68 feet.
One last point on the above...all of this presumes a "FLAT" EQ setting...no boosts on any EQ...boosts on the EQ come off the power handling! How many of you find you have to boost the high-end to push the sound through the screen? If you are like me and find that yup, even in the best environments a little treble shelving is needed to offset the screen loss...you have even less to work with.
Compare the above with the Altec 299 (1.4") with a MR94B Mantaray and you get out to 147 feet or 104 feet with a 3-dB safety margin. Check out the Lyric's photos in the galley to see the Altec 229 on an MR-94B
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