new eminence catalogue [message #40998] |
Tue, 15 April 2003 16:44 ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
replay
Messages: 284 Registered: May 2009
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Grand Master |
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i just picked up the new loudspeaker handbook from eminence. it is much more thorough than last year's. complete descriptions of every thiele-small parameter that even myself & bill epstein can understand. also includes recommended box volumes for each driver. no wonder my theater 4 pi's have no bass, the delta pro is meant for a much smaller box! they now provide the sensitivity of each driver at various frequencies. something i found really cool was how 15" drivers start to beam frequencies at 1052hz, 18 inch woofers start beaming at 903hz. i wonder if horn loading these large woofers would alleviate this problem? they also chart each driver by frequency performance and give it a 3 to 5 star rating for performance. real cool! the new line of deltalite drivers looks interesting as well.cheers, george
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Re: new eminence catalogue [message #41000 is a reply to message #40998] |
Tue, 15 April 2003 17:49 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
Ian Douglas
Messages: 8 Registered: May 2009
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Esquire |
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Could the Theater 4Pi's (and hence 7Pi's) really be made with smaller enclosures and still sound as good? That is actually one of the things that could be an issue for me. The boxes are a bit larger than I would like. Also, is there anywhere on their site I can request one of these handbooks? -Ian
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Directionality Index [message #41003 is a reply to message #40998] |
Tue, 15 April 2003 20:15 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
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Wayne Parham
Messages: 18748 Registered: January 2001
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Illuminati (33rd Degree) |
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You're right about drivers directionality increasing as frequency goes up. As frequency rises, the radiator becomes larger than the wavelength of the sound it generates. It ceases to act like a point source and starts becoming directional.Horns are normally much more directional than direct radiators. But when a direct radiator starts to beam because of its size, its directionality index nears that of a horn. Because of this, you can design a speaker that mates two subsystems where their directionality is roughly equal. That's pretty much what large format two-way systems do. Check out the AES paper called "Improvements in Monitor Loudspeaker Systems," written by David Smith, Don Keele and John Eargle. It talks about this kind of design. Chapter 3 of Augsperger's "Sound System Design Reference Manual" also discusses this subject, and pages 3-4 and 3-5 are specifically about the directionality of circular radiators, i.e. cone drivers.
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Re: Delta's and Delta Pro's [message #41006 is a reply to message #41004] |
Tue, 15 April 2003 21:11 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
Ian Douglas
Messages: 8 Registered: May 2009
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Esquire |
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There isn't a Pi model with the Delta Pro's, but is it possible to make a modified Theater Pi with the Delta Pro? More specifically, is it recommended? Should I use PiAlign to compare the two drivers and get a feel for what the tradeoffs would be for the smaller Delta Pro box? I am concerned about the low frequency performance, but if the Pros gave me similar low frequency performance in a smaller box (hence higher SAF :) it might be worth the extra cost. -Ian
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Thanks for your help everyone... [message #41020 is a reply to message #41000] |
Wed, 16 April 2003 10:22 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
Ian Douglas
Messages: 8 Registered: May 2009
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Esquire |
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Thanks for your help and I've done some searching, and it looks like I'll stick with the regular Delta drivers, since the Pros won't allow me to make a smaller box and perform as well. If I had the Pros lying around, I'd use them, but I'm buying everything. -Ian
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I think you'll like 'em a lot [message #41025 is a reply to message #41020] |
Wed, 16 April 2003 13:14 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) ![Go to next message Go to previous message](/forum/theme/AudioRoundTable/images/down.png) |
ToFo
Messages: 219 Registered: May 2009
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Master |
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They're great. As for size, Even in a smallish room, if they mesh with other furniture well, they appear smaller with age and creative decorating. Besides, they are actually made to go up against the wall. I actually have more walking area than I did with mini monitors. (My vifa's sounded good about four feet out into the room) My friend Jennifer and one of her female buddies said "damn! Huge!", but then they put on some music. I walked back in later and they were pointing at places in the soundstage and saying things about "Her voice" sounding real. Wow! Not one comment about them being huge since. Of course your mileage may vary, but if you keep them playing, I know what people will notice first : ) Have fun! Thomas
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