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Old 5th December 2012, 07:40 AM   #1
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Default Tempted by opportunities on a driver vs picking a design

I keep stumbling across "very tempting, very interesting" drivers that don't match up with designs I have been planning on. Last year I ran across a guy clearing out an old theater with a LOAD of EV 18" drivers, then another guy with some of the Emminence LAB series, and whats killing me are some McCauley 18" 6256 drivers. Issue with the big guys is they are pro sound designed for 30hz up, and I want a sub to match up with Klipsch Forte or Hersey's high passed around 50 hz or so.

The thought has crossed my mind to build monster two or three way based on one of the 18" woofers as a direct radiator combined with maybe the two horns out of a Hersey, or some other horn mid.

Would a tuned port allow use an octave below the fs?
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Old 5th December 2012, 09:33 AM   #2
sreten is offline sreten  United Kingdom
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30Hz tuning in a 150L box looks very usable. Though I'd go for 25Hz.
Will give you very near a quasi first order roll-of down to 20Hz.

rgds, sreten.
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Old 6th December 2012, 01:43 AM   #3
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I need to buy a fresh set of tools, measuring and modeling stuff. Its been a good decade since I was active, and I wasn't deep in the technical side then, more a I like this, like that, want to try this etc. One of the guys whose opinion I respected a lot had a single McCauley 18 and claimed there was nothing better. I suspect it was the 6174 the low end monster fs 20 and 2 inch excursion.
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Old 6th December 2012, 03:31 AM   #4
djn is online now djn  United States
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You might want to look at this for a great start for measuring gear.

UMIK-1 | miniDSP

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Old 7th December 2012, 06:56 AM   #5
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Originally Posted by djn View Post
You might want to look at this for a great start for measuring gear.

UMIK-1 | miniDSP

Something like that I am sure. I will be looking at whats around and who has a bundle that does all I want.

I'm not sure if I want to get into room correction in a proprietary system, not if I buy a new front end and find it both incompatible and included.

Basic driver measurements, TS parms to feed some kind of modeling.

Basic and maybe fancy room measurements, RTA, waterfall, maybe some kind of MLSS.
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Old 7th December 2012, 08:03 AM   #6
bjorno is offline bjorno  Sweden
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Originally Posted by mikeford View Post
.. 2 inch excursion..
Hi Mike,

I don't think you at any time should count with 2 inch excursion for the the 6174.

Attached Images
File Type: jpg McCauley 6174.JPG (847.8 KB, 55 views)
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Old 8th December 2012, 08:54 AM   #7
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Xmax is .6, but it says ... Click the image to open in full size. 2" Peak to Peak Excursion

I figure if one of them is moving even close to an inch, distortion from the driver may not be the principle concern.

McCauley.com : Products: Accessories > 6174: Overview
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Old 10th December 2012, 09:08 PM   #8
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Very disappointing, I ran the TS of the McCauley 6256 through a couple online box calculators and the f3 is 43hz, great I suppose for PA use, but outside my knowledge how to use them in a home setting other than lease breakers.
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