| Re: second array already in the works [message #60720 is a reply to message #60716] |
Mon, 31 August 2009 12:57   |
darkmoebius2
Messages: 37
Registered: August 2009
Location: Los Angeles, CA
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Baron |
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| Villain3g wrote on Mon, 31 August 2009 11:27 | I saw that in there, but thought it was a little unclear. Because I know 10k is audible.
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Without going to vertical ribbons, it is going to be nearly impossible to do better than that. Eric J/Marlboro was able to shave enough flange off Dayton ND20FA-6 3/4" Dome Tweeters to get comb filtering out to 15k. But, if I remember correctly, he mentioned that he wouldn't go through all that hassle again if he had the chance. You might want to try the rear-mount version, Dayton ND20FB-4, of his tweeter which has no flange. Could save you a hell of a lot of time, frustration, and get nearly the same, or better, results than the Tang Band.
| Quote: | Next question relates to pairing the drivers. The tweeters are 92db. The woofers are at 88db...I am afraid that they will be too loud compared to the woofers.
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Funny hat should ask that exact question this morning! I was up all night trying to crash-course myself on driver matching and crossover/filter design.
Elliott Sound Products has excellent tutorials on all aspects of DIY Audio. I suggest you read all of these primers related to speaker/crossover design. I did last night and my understanding(while still beginner) is lightyears ahead of what it was before. These are all short (1-4 pages) but pack a lot of information, yet are still easy for the beginner to understand. He also provides free complete designs for working passive and active crossovers, notch filters, etc - all you will need.
Design of Passive Crossovers
Benefits of Bi-Amping (Not Quite Magic, But Close) - Part 1
Benefits of Bi-Amping (Not Quite Magic, But Close) - Part 2
Active Filters
Effects Of Source Impedance on Loudspeakers
Phase, Time and Distortion in Loudspeakers
Baffle Step Compensation
Doppler distortion in loudspeakers - Real or Imaginary?
| Quote: | It looks like 12 woofers power tapered in 2,4,6 orientation is most appealing, resulting in 8.7 ohms. Would that give me an efficiency of around 98db?...If I had 32 tweeters, is there in optimal arrangement that would result in an appropriate efficiency?
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I leave those questions to those with more experience and knowledge than me.
| Quote: | Can I have different impedances for the tweeters and woofers? Does that impact the design of the crossovers?
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Absolutely to both questions. | Quote: | I was hoping the use parts express's 2way 3k 8ohm crossover.
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Don't. Read the links I provided above and you'll see why that would completely undermine all the planning and design you put into your arrays. Build your own, active if possible.
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