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Old 11th November 2004, 12:42 PM   #1
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Default Cain & Cain Abby Clone

I call the project: Clabby (Clone Abby)

What do you think about these simulations?
http://www.diyaudio.com/forums/showt...765#post509765

I want a good compromise between cloning the look and cloning the sound. I am also planning to use solid wood to do the TL.
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Old 11th November 2004, 05:48 PM   #2
TC is offline TC  United States
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The real Abby is not very expensive .

TC
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Old 11th November 2004, 09:12 PM   #3
gl is offline gl  United States
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Mr. Cain,

My complements to you on your loudspeakers. As you say they are not expensive. In fact considering the artistry, the time, and the quality materials put into them they represent a true bargain. I too am a life long woodworker and I appreciate what you have achieved.

That being said, this is after all, a DIY forum. You need to expect that the people here will generally choose to build rather than buy if possible. But I suspect that your comment was tongue in cheek.

Since you are here as a member I would like to ask you a couple of questions about your Abbey loudspeaker. You have included a turned. round plate behind the driver as a design element. Seigfried Linkwitz has some very interesting half space frequency response curves that he recorded using circular and square open baffle backing plates. These are on his web site and show significant comb filtering effects for the circular plates. I was wondering why you chose to use the circular plate as opposed to none at all. The port you use seems a bit small for the Fostex driver used and I was also wondering what the design rational was for the oval shape as opposed to square. Comments?

Regards,
GL
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Old 11th November 2004, 09:29 PM   #4
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Terry has made his choices, some of which contradict
conventional wisdom. From the little I know about how
he proceeds, his product contains a great deal of trial
and error and his decisions are based on listening more
than anything else. The result is an excellent product
which I'm happy to say I bought and use.
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Old 11th November 2004, 09:54 PM   #5
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Default Off Topic

FrankDIY,
A strange connection just closed in my mind...
You aren't by any chance moonlighting as a wine steward for a guy named Marcel, are you?

http://www.marcelgagne.com/

Cody
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Old 11th November 2004, 11:59 PM   #6
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Default Re: Off Topic

Quote:
Originally posted by TC
The real Abby is not very expensive .

TC
I agree Mr Cain. The price asked for these speakers is very low. Unfortunatelly they are not available in Montreal and like most people here, we enjoy DIY and we love designing new projects or cloning great ideas. I did the same thing with many projects from Pass Labs. See that project a rewards for your unique and great quality product. Nobody on this forum is cloning bad product. I think this is a good sign

Seeing the pass few comments, I am very proud to see I have generated interest from two famous people

This pair of speaker will be presented in a contest that I am organizing in Montreal. Any comments on my design will be always appreciated.

Quote:
Originally posted by reverber
FrankDIY,
A strange connection just closed in my mind...
You aren't by any chance moonlighting as a wine steward for a guy named Marcel, are you?

http://www.marcelgagne.com/

Cody
No connection with that guy


Thanks for your comments!
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Old 12th November 2004, 12:21 AM   #7
TC is offline TC  United States
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Thanks for the compliments gl. Yeah, I was attempting a veiled "funny".

The circular baffle projects the speaker out and away from the main baffle. With all the edges rounded with a long gradually decreasing radii, diffraction effects have been minimised. While I am sure some artifacts could be measured bouncing off the baffle I doubt it adds anything annoying that you could hear. It has been speculated that the baffle I make contributes to the large soundstage my spkr seems able to produce, again by elevating the driver off of the main cabinet a bit. Moreover I was interested in further reducing cabinet energy from reaching the driver by adding the (circular) mass. "Comb filtering" effects would be something that 2 drivers do, or two radiation points.. The diffraction effects of a single driver _can_ be seens as comb filtering though i see it as a stretch, implying first order cancellations. Not having read SL's paper you mention I am only guessing. The added mass and fluid surface adds benefits to the rest of the spectrum, if a slight cancellation/reinforcement results from a circular baffle it must be very slight.

Now if the circular baffle had sharp edges and was flush with the driver for it's circumference that could be easier to measure a step.

The port area was arrived at by building many a pipe. The design subscribes to alot of different theories about Voigts. I rely primariliy on actual physical modeling and measurements to arrive at these designs after the initial design work is complete. Choking off the pipe reduces ripple and pipe effect. The oval shape creates a wider sloping, fluid velocity value, lowering it's own self noise. May not even be audible vs a circular port.

TC
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Old 12th November 2004, 12:34 AM   #8
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This is very interesting. Based on these affirmations, I guess you did not use any baffle step compensation and then keep the efficency very high.
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Old 12th November 2004, 03:48 PM   #9
TC is offline TC  United States
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Quote:
. Based on these affirmations, I guess you did not use any baffle step compensation and then keep the efficency very high.
Right.

Quote:
we enjoy DIY and we love designing new projects or cloning great ideas
Thanks again. and good on ya.

TC

Here's a link to a nice clone http://cls.audiogon.com/cgi-bin/cls....ull&1105182133
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Old 12th November 2004, 05:38 PM   #10
gl is offline gl  United States
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Mr. Cain,

Thank you for your gracious and detailed reply. I appreciate you sharing your design experiences with us. I also appreciate you taking the time to answer my questions. I am experimenting with FR stuff at the moment and those particular questions about the Abbey have been in the back of my mind for a while.

Regards,
Graeme
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