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Hi folks....I'm looking for some help with a project. I want to build some "Cornscala"-style speakers, but on an extremely limited budget. I have the tweeter and midrange (EV T35 and Atlas PD5 with some horns I found on Ebay.) I want to use the MCM 55-3213 as the woofer. I've worked with it in some of the freeware box programs, but I'd like some additional input. (Or maybe validation!)
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Can you measure T/S vs. relying of published specs?
Going by the published MCM data seems to be kind of a crap shoot, but at least there is a returns policy.
IME, the 12" woofers I got from them measured close enough to the specs that I could model and build something useful.
Dont get me wrong, allot of manufacturers claim operation points that can be very conservative or generous. But more so I am VERY far from an expert on interpreting driver performance and or proper use.
I found this post in diyaudio. A fellow was selling his stamped frame crites woofers. Seems a better comparison...
"CW1526 stamped frame
FS is 26.3, Re is 3.40, VAS is 437.2 liters, BL is 11.63 Tm, QM is 9.19, QE is 0.36, QT is 0.35. Sensitivity is 95.3 db. Coil is 1 mH.
Pmax is 150 watts, Xmax is 7.15 mm, MMS is 87.5 grams, Cms is 0.420 mm/N"
Compared to the MCM drivers
Fs is lower
Sens is a bit lower
Xmax is a bit better
And everything Ive read of crites woofers folks and specs claim they reach notably deeper.
In quickly looking over parts express I found this goldwood driver...
http://www.parts-express.com/goldwood-gw-1558-15-pro-woofer--290-384
Its 8 ohm be forewarned...
Its basic specs seem a little more in line with what is shown above. I may be TOTALLY wrong about this... Im sure some much smarter folks will point this out to all if so... Just trying to possibly help...
The cornscala always seemed like a really cool, big sounding, full range, high eff speaker to me. Id really love to hear a pair in person. I wish you the best. And I know ALLOT of folks try to build these on the cheap. So your far from the 1st and may well get some good help from folks who have done the same. I hope so. Let us know how it turns out.
For what its worth I own and love a pair of Forte series 1's. I can totally see the appeal of like Klipsch speakers. Wonderful full sound IMO.
I thought the Crites cast frame was the one that had the little bump around 40hz. I've tried them in Khorns and Belles.
High sensitivity, wide dynamic range, low distortion, and smooth frequency response. Pwk
http://www.itishifi.com
I couldnt find any specs on the woofers via crites site. I could easily have missed it. They are wonderful people to deal with. Reached on the phone quite quickly in my experience. Clearly they have a good grasp of all things Klipsch. With one heck of a following.
I know theres allot written about it on the net in many places. Clearly Klipsch forums being a big one.
Sounds the OP has a pretty decent understanding of things. Will see what other advice pops up.
Hope his project turns out splendid!
Thanks, folks. I've been doing comparisons on every 15" woofer I can find under $100. I've been doing software comparisons against the K33, Crites 1526, and Eminence Kappa 15C. These seem to perform very similar, given a couple more cubic feet in the box and tuned to about 30hz. They also happen to be crazy cheap. Has anyone else done any modeling on them?
The question you should be asking is has anybody measure the T/S parameters.
The 12" version of that driver is so far off that the only thing it is suitable for is an OB system.
Hello, fellow frugal diy-er here, what comes to my mind having attempted to use many costlier part substitutes is the additional labor and possibly materials required to execute the often marginal build. This could easily exceed the additional $100 (or so) for the established and known part. I wish you luck. JH
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