[Joe Bloggs]

Oh you were registered all right

 

[arktraveller]

I really admire James craftsmanship and dedication, and have told him so before on the Asylum. Can't wait to see what he does next.

But for extreme, take a look at Mr Roggerios system. Those big things at the back are his basshorns driven by 6 Altec 515's per side.
ftp://invalid.ed.unit.no/pub/picture.../roggiero.jpg.

Or the Volks sytem. Just the thing for those teenage doof doofs. Or better yet, for revenge. ftp://invalid.ed.unit.no/pub/pictures/audio/VOLKS4.JPG

A set of funky tractrix mids made up out of laminated sheets. http://www.spiritone.com/~tube/guiseppe.jpg

The there's Mr Green's Tannoy Westminster clones. These are front and rear loaded 15"Tannoys. The boxes are a maze inside. http://members.tripod.com/fn8142b/images/GREEN.jpg

Then for all you poor direct radiator types there's these monsters. The pix speak for themselves, but I'd love to know what they sound like. http://www.magico.net/Speakers/Latest/WALLS.html Or the Legacy Whisper clone. Not my cup of cha, but one heck of a good job. http://users.t-three.com/ttriff/page23.html .

These are all the URLs I can find in the I have stored. Somewhere I have some construction pix of some HUGE horns. I'll post it if I find it.

Hope you enjoyed these. It's good to know there are other people out there as crazy as me. I feel less lonely. Sigh...

Cherrs
Brett

 

[Neruda]

budgie, are these the tweeters used in your line array?

I ask because I'm still trying to prove the theory that line arrays increase efficiency. Each of those tweeters produces 90db/watt by itself, so if your line array uses these tweeters and really measures 98db/watt, then the efficiency is definitely being boosted.

 

[ringtheorist]

It's not really a "theory" is it? If you look at the Thiel-Small equations, you have that the sensitivity of speakers being determined by a number of parameters, one of which is Sd, or radiating area. However, the sensitivity is proportional to the square of Sd, but only linear with respect to Mms (moving mass). So you're doubling the Mms, and doubling the Sd but _squaring_ the Sd parameter in the sensitivity equation, so you get, effectively, another 3dB of SPL's for the same amount of work.

Some equations:

Vas = 1.4 * 10^18 * Cms * Sd^2
Sensitivity = 112.2 * 10 log (9.78 * 10^(-10) * Vas * Fs^3 / Qes)

Where Cms is the mechanical compliance of the suspension (a number depending upon the rigidity of your spider, surround, etc.)

That's my understanding...

b

 

[Neruda]

Quote:

Originally posted by ringtheorist It's not really a "theory" is it?

I didn't think it was myself, but I've had a hard time proving that it isn't recently.

 

[kwkarth]

Quote:

Originally posted by ringtheorist Have any of you considered a dual d'Appolito in a single enclosure? I was thinking of maybe MTMWMTM, although the configuration on the actual speaker may vary. I was looking at an ubercheap 84dB/1W/1m mid. If you wired them in parallel/series pairs, then you'd get about 90dB/1W/1m from those because of the quadrupling in radiating area but keeping impedence constant. You could pick up some 4 ohm tweets and wire them in series, and get a nicely efficient sub like a 98dB 12" or something. You could build it line-array stylee with an arc in your front baffle so as to minimize delay distortion, since the speaker would have to be mighty tall if you build them in exactly the MTMWMTM order. b

1. you would defeat the purpose of a d'Appolito design.
2. in doing so, you would incur excessive phase cancellation problems between the tweeters as they would be too far apart. Keep like drivers together and work starting with the tweeters at the center.

 

[Dusty Chalk]

Quote:

Originally posted by kwkarth 1. you would defeat the purpose of a d'Appolito design.

Hey, have you seen the new Wegg3 design?
www.wegg3.com -- specifically, read the write-up about how he tricks your ears into believing that arc of tweeters is a point-source. Very interesting, I would like to hear it. Read a review in S&V (of all places), and the guy said he could not locate the tweeter with his eyes closed.

 

[kwkarth]

Quote:

Originally posted by DustyChalk Hey, have you seen the new Wegg3 design? www.wegg3.com -- specifically, read the write-up about how he tricks your ears into believing that arc of tweeters is a point-source. Very interesting, I would like to hear it. Read a review in S&V (of all places), and the guy said he could not locate the tweeter with his eyes closed.

There's a lot of interesting ad copy there. It would bore most to tears except for geeks like us. I too would like to hear these. Some of what they say is obvious, some is plausible, some is..., well, a phrase attributed to P.T. Barnum comes to mind. I've tried some of the things they talk about, and wanted to try a number of other things they mention. Really, the proof of the pudding is in the eating. Bring 'em on!!