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Old 9th November 2010, 09:36 PM   #71
chrisb is offline chrisb  Canada
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Quote:
Originally Posted by kristleifur View Post
Going back to this ... if you don't mind ... What about rounding over the edge? (Perhaps making two baffle pieces glued together back-to-back to create a rounded edge on both sides.)

it's been my experience that a simple 45* chamfered edge is as effective as small radius on edges, and certainly a lot easier to cut ( either on the table saw or by router) - indeed, it's become somewhat of an aesthetic signature on my builds
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Old 9th November 2010, 09:44 PM   #72
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it's been my experience that a simple 45* chamfered edge is as effective as small radius on edges, and certainly a lot easier to cut ( either on the table saw or by router) - indeed, it's become somewhat of an aesthetic signature on my builds
One more general question if you good fellows don't mind – If I have both roundover and angled guide bits for my router, suitable to the thickness, the angle is easier to cut?
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Old 9th November 2010, 09:55 PM   #73
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Look back at page 23 of Olson. If you look at the ripple caused by the rear termination of the shape you can see that it needs to be deep to minimize ripple (ie sphere vrs half-sphere, the 2 cyliders, the other truncated shapes). The size of the edge also determines the effective transition frequency. An ideal shape is something like the mid enclosure for a B&W 800 Nautilus, and clues can be had from the shape of the helmets pursuit cyclists wear.

Click the image to open in full size.

Nothing wrong with your aspect, i'd just make it deeper, with a larger radius.

One of the beauties thou ot the removable supraBaffle is the ability to wswap out different experiments.

dave
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Old 9th November 2010, 09:58 PM   #74
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THANKS! Great answers, something to chew on.
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Old 9th November 2010, 10:29 PM   #75
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Originally Posted by planet10 View Post
Look back at page 23 of Olson. If you look at the ripple caused by the rear termination of the shape you can see that it needs to be deep to minimize ripple (ie sphere vrs half-sphere, the 2 cyliders, the other truncated shapes). The size of the edge also determines the effective transition frequency. An ideal shape is something like the mid enclosure for a B&W 800 Nautilus, and clues can be had from the shape of the helmets pursuit cyclists wear.

Click the image to open in full size.

Nothing wrong with your aspect, i'd just make it deeper, with a larger radius.

One of the beauties thou ot the removable supraBaffle is the ability to wswap out different experiments.

dave
So where does the drive unit go??
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Old 9th November 2010, 10:30 PM   #76
chrisb is offline chrisb  Canada
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Originally Posted by kristleifur View Post
One more general question if you good fellows don't mind – If I have both roundover and angled guide bits for my router, suitable to the thickness, the angle is easier to cut?

Click the image to open in full size.


see "J" above - a thick enough square supra-baffle with 4 chamfered sides emulates a truncated pyramid on parallelopided (just for fun look that up)

I've made these as thick as 6 layers of 3/4" plywood, and cut them on table saw


Alan: I tend to locate the drivers in the center of suprabaffles, whatever their shape
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Old 9th November 2010, 10:48 PM   #77
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So where does the drive unit go??
The magnet would impact his forehead... and you'd need to fill in the hole for his head with a symmetrical completion of the shape.

dave
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Old 10th November 2010, 03:18 AM   #78
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I live at approximately 5000 ft elevation, where the speed of sound is approximately 2% slower than it is at sea level. Should I scale the dimensions on the Mk3 by 2% for optimal performance?
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Old 10th November 2010, 03:36 AM   #79
chrisb is offline chrisb  Canada
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I live at approximately 5000 ft elevation, where the speed of sound is approximately 2% slower than it is at sea level. Should I scale the dimensions on the Mk3 by 2% for optimal performance?

just run your audio system on a Variac dialed for slightly higher AC mains voltage, and you should be good to go
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Old 14th November 2010, 11:54 PM   #80
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job done! or it will be when i get round to putting a finish on them, i think they need a bit more stuffing to improve the bass.
but they sound great, many thanks to the trio.
simon
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