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06-08-2011, 07:33 AM
| | Registered User | | Join Date: Jun 2004 Location: Chicago | | | 12+12=24
24>15
more is better |
06-08-2011, 11:47 PM
| | | Quote: |
Originally Posted by fingers 12+12=24
24>15
more is better | Actually, is area what matters. That's because is the area that is moving air what creates sound. Hence, a 12inches diameter vs a15inches is sqr(12/2) times PI, vs sqr(15/2) times PI, that is, 36/56. If you have two 12's, the ratio will be 72/56. So a 15er gives you less than two 12ers, but not in the ratio 24/15. Yes, I'm a disgusting engineer...
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06-09-2011, 12:50 AM
|  | only immortal for a limited time
Owner & speaker designer, AudioKinesis | | Join Date: Nov 2008 Location: Preston, Idaho | | Quote:
Originally Posted by Raka  Actually, is area what matters... Yes, I'm a disgusting engineer... | One might argue that it's displacement that matters, in which case we'd also have to know the linear excursions of the drivers in question. And yes, I'm an utterly revolting speakergeek... |
06-09-2011, 07:45 AM
|  | Oracle, Ancient Order of Rass Hattur; Mem. #1, EPC | | Join Date: Apr 2004 Location: Connecticut | | In the end, what counts is acoustic radiated power. Indeed, displacement is key, which is a direct function of radiating area of the cone and its excursion if you're considering a direct radiator. Of course, one can produce enormous amounts of acoustic power with a 15" cone that moves only a fraction of an inch. If you're a real geek, then you'll know how that can be and has been done. 
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Last edited by drurb : 06-09-2011 at 08:01 AM.
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06-09-2011, 10:12 AM
| | Registered User | | Join Date: Oct 2007 Location: Boston, MA | | Um...excuse me...how much of this will be on the test? |
06-09-2011, 02:06 PM
| | only immortal for a limited time
Owner & speaker designer, AudioKinesis | | Join Date: Nov 2008 Location: Preston, Idaho | | Quote:
Originally Posted by drurb In the end, what counts is acoustic radiated power. Indeed, displacement is key, which is a direct function of radiating area of the cone and its excursion if you're considering a direct radiator. Of course, one can produce enormous amounts of acoustic power with a 15" cone that moves only a fraction of an inch. If you're a real geek, then you'll know how that can be and has been done. | Hmmm... that would probably require some sort of acoustic transformer... okay, I've been out-geeked! |
06-09-2011, 11:24 PM
| | | Quote:
Originally Posted by DukeLeJeune And yes, I'm an utterly revolting speakergeek... | I used to be one of that kind, including a design and manufacturing of a dipole, but now I don't have time for everything, and I choose to be in the other side of the speaker...
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06-10-2011, 08:59 AM
| | Oracle, Ancient Order of Rass Hattur; Mem. #1, EPC | | Join Date: Apr 2004 Location: Connecticut | | Quote:
Originally Posted by DukeLeJeune Hmmm... that would probably require some sort of acoustic transformer... okay, I've been out-geeked! | No, you haven't been out-geeked! You're a full-fledged member of the speaker geekazoid club!
Here's your prize: 
Indeed, an "acoustic transformer," aka horn loading. Just make that 15" driver a compression driver at the throat of a giant (folded) horn. 
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Famous last words: And with that- Im gone. You will probably read in the paper soon about a deranged kid who burns his bass in front of a luthier. |
01-04-2013, 12:21 PM
| | | | 15 inch speakers a great, have used them for years. Tried my 2 x 10 on it's own and was not a patch on the 15 (using the same amp) |
01-04-2013, 05:45 PM
| | Registered User | | Join Date: Nov 2012 Location: Virginia | | | 15s are the default choice and the reference point
410 were popular for a while
2x210 were once en vogue
Now 2x112 are the thing...
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01-05-2013, 08:12 PM
|  | Registered User
Authorized fEARful/FEARLESS/greenboy designs builder | | Join Date: Mar 2011 Location: Nashville, TN | | Sorry, to be a bummer, but there's a lot of silly talk going on here
You really don't do yourself any favors thinking 10's sound one way, 15's another, etc...these days there's just way too many variables to think that way.
Duke's amazing AudioKinesis cabs are a great example. I toured the TC115AF and it was smooth and clear...not 'boomy' at all. He just happened to choose that driver for that cab, and it's awesome...
Not to be 'that guy' but I've toured a whole lot on many different rigs, playing primarily upright bass. Acme makes a 410 that works pretty darn well for upright, though I agree that most 410's, by design, aren't really the ticket for upright bass.
Choices should be based on size, weight and SPL way more than on the size of the driver itself.
For upright, the best cabs I've ever heard are (and I don't claim to have heard them all, but I've heard more than most) ;
AudioKinesis TC112, TC115 and TC212
greenboy's FEARLESS line of cabs. F110, F112, F115, with the F115 being my favorite.
If you're a jazzer, or don't want huge lows, the greenboy Crazy 88 is really nice too
There's just so much cool new gear to help upright players these days...great times for us  |
01-08-2013, 12:24 AM
| | only immortal for a limited time
Owner & speaker designer, AudioKinesis | | Join Date: Nov 2008 Location: Preston, Idaho | | Quote:
Originally Posted by drurb No, you haven't been out-geeked! You're a full-fledged member of the speaker geekazoid club!
Here's your prize:
Indeed, an "acoustic transformer," aka horn loading. Just make that 15" driver a compression driver at the throat of a giant (folded) horn. | [geekjoke]
So Paul Klipsch is walking down the sidewalk and who should he see approaching but Peter Walker, Henry Kloss, and Amar Bose.
Paul cups his hands around his mouth, horn-like you know, and says, "Good morning, gentlemen! How are you all doing?"
Well, Peter Walker is ecstatic; Henry Kloss is infinitely baffled; and Amar Bose turns around, faces in the opposite direction, and replies, "Just fine, Paul, and how are you?"
[/geekjoke]
Last edited by DukeLeJeune : 01-08-2013 at 12:36 AM.
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01-08-2013, 12:31 AM
| | Registered User | | Join Date: Oct 2009 Location: Rochester, NH | | i use a swr sm400 head with a single EV 15" woofer built into a flight case.
I love it..
here is a video from a out door show a couple summers ago. just the audio from the little point and shoot camera my wife uses.
its plenty to feel it outside even and it cuts through the mix of the guitars really well.. and 15" booooooooms http://youtu.be/bHna1N8GVQc
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