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In Reply to: RE: Line array posted by Hornlover on April 08, 2014 at 07:47:26
With such small drivers I wonder if tweeters are necessary at all. The project that prompted me to start this thread consisted of 9 x 2" drivers per side and had very good top end - no tweeters required.
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uses 25 - 3.5" drivers in his IDS-25 and still found the need to equalize both ends. Smaller drivers would likely help on the top, but compromise the bottom.
IDS-25 Speaker
A good loudspeaker system should use drivers that are optimized for the physical characteristics - cone stiffness, suspension compliance, Q's and F's and a host of other perameters - if it doesn't have a flat response but does all the other stuff exceptionally - then a little (or lot) of Passive (or Active EQ) is a great way optimize the frequency response. Note you can't just use any EQ - to preserve an great impulse response you need to properly model the EQ, the correct poles and Zeros. Remember it is not the frequency response we are trying to optimize (the room destroys that) it is the impulse response. A flat frequency response is the result of a good impulse response. Heyser taught us that!
Three most important things in Audio reproduction: Keep the noise levels low, the power high and the room diffuse.
the boost required will likely require an active solution as Rog found to be the case.
Almost $19K? How do people come up with these numbers? Well, not in this year's budget...
I have a set of Bose 901 series III that I picked up for free. That gives me 18 4.5" drivers...I was toying with the idea of turning them into a pair of line arrays, I wonder if anyone has ever done that hack?
I imagine most small drivers could get away with no tweeters. I was really trying to show the research behind that particular curved line array improving on the traditional straight line array.
It's also quit possible that after 50+ one simply doesn't need tweeters...
Edits: 04/10/14
These drivers are made by Aurasound. They feature Aurasound's Neo-Radial Technology (NRT) motors, with neodymium magnets. This is the technology that first appeared on the Aura 1808 professional 18" subwoofer driver, which was extremely well-recieved and one of the longest-excursion pro sound drivers in its day, used in the huge BassMaxx subwoofer. Need lots of power, using Emotiva LPA1
The TOTL seas dome tweeters use the neo-radial design also.
Maybe others too, don't know.
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