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Old 14th December 2012, 12:54 AM   #711
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Styrofoam Smith Horn
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Old 14th December 2012, 01:33 AM   #712
xrk971 is online now xrk971  United States
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Ken Peter,
Thanks for the tip! This could just be made into a circle with driver pointed into circle plane and directed out to perimeter. This is good as waveguide but doesn't have long path unless made big in diameter. Nonetheless, gives me ideas.... How did your Smith Horn sound?
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Old 14th December 2012, 05:37 AM   #713
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would my little 2.5inch drivers sound anygood down to 200hz in a double stacked smith horn like what was posted @ #711?

and also, is this horn any good for close range? ie: on a desk very roughly 10inches from each ear?
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Old 14th December 2012, 10:29 AM   #714
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instead of clouding up this thread with my questions on cabs, i started a new thread.

some guidance to building reference speakers please
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Old 14th December 2012, 10:50 AM   #715
xrk971 is online now xrk971  United States
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Quote:
Originally Posted by klampykixx View Post
would my little 2.5inch drivers sound anygood down to 200hz in a double stacked smith horn like what was posted @ #711?

and also, is this horn any good for close range? ie: on a desk very roughly 10inches from each ear?
It depends on whether it was designed to be a full range or a tweeter. For example a 2 inch Visaton FRS5 had an fs of 180 Hz, so yes. But I have also seen 3 inch tweeters that wont go below 2000 Hz.
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Old 14th December 2012, 11:14 AM   #716
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the drivers came out of a sony home theatre setup. all the satellites where the same, each had its own 100uf cap.
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Old 14th December 2012, 11:32 AM   #717
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Then the Sony's are full rangers. The value of the cap and the impedance of the drivers will let you calculate the cutoff freq of the drivers as Sony had designed them for. If those are 8 ohm drivers, I think the cutoff frequency is about 200 Hz. Usually, the cutoff will be higher than what they are capable of going down to in a proper cabinet and direct driven without the cap. I see you are doing the trading sleep for speaker building.... it is about midnight in Sydney right?

http://www.parts-express.com/resourc...8d187d07c44e28

Last edited by xrk971; 14th December 2012 at 11:39 AM.
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Old 14th December 2012, 11:34 AM   #718
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11.34pm in CoffsHarbour, 7hours north of sydney.
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Old 14th December 2012, 11:37 AM   #719
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estimated cutoff frequency is approx 110hz@6db/oct and i have planned to run them at about 200hz@12db/oct pending on how they sound, and based on Hornresp results on the 8inch drivers i simmed.
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Old 14th December 2012, 08:02 PM   #720
xrk971 is online now xrk971  United States
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Quote:
Originally Posted by adason View Post
thanks for the response xrk971, one easy thing you could do is to measure your spiral horn first, than close the side openings and remeasure again the same box (it does no matter what inside is the box is closed)
Adason,

Here are the mp3 sound clips of the difference between what comes from the mini Cornucopya (20 in) for the direct driver radiation plus the horns, versus the horns only. I did this the lazy way by laying it flat on the floor face up for the combined output, and the placed it on a pillow on the floor face down to block the direct output for the horn only output. I placed the XY mic about 1.5 meters above the speakers which were spaced 1 meter apart (center to center).

Obviously, there is quite a bit of output from the horns as you can tell (there is a small rattling on the horns only clip because the hanging wire is resting on the back of the box when it is face down and I did not bother to silence it). At high volume, I can feel the pressure wave coming from the horn mouths similar to the effect you get when you place your hand at the port of a bass reflex woofer.

Hope this is convincing enough for you to build.

Enjoy.
Attached Files
File Type: zip COrnucopya-direct-and-horn.zip (820.4 KB, 211 views)
File Type: zip Cornucopya-horn-only.zip (748.2 KB, 149 views)

Last edited by xrk971; 14th December 2012 at 08:11 PM.
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