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Ukko Kari

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Ukko Kari last won the day on October 20 2019

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About Ukko Kari

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  1. A better option than a simple 90 degree short radius elbow fitting would be a sweep elbow. Here is a table on the frictional losses of different pipe diameters and the types of fittings. http://media.wattswater.com/orion-hp-frictionloss.pdf 4" long radius sweep elbows are utilized in electrical service installations, you may be able to source something locally. If you are on Mac or Linux, you could use Wine to install WinISD, if you desire. Regarding port length, this depends on how close in proximity the port inlet and outlet are to boundaries, this can change the actual installed length for the desired tuning, and if an inner flange or torus is used on the end of the pipe.
  2. Not much of an update, since I haven't had a chance to work on this box or it's mate, but here's a few more pictures. There was a small error in the angle of the slices cut with a homemade large miter box and a handsaw, which were edge sanded before gluing, which resulted in a greater than 90 degree angle. The bottom and top of the enclosure need bracing, which will be tied into the front and back, and a few side to side braces will be installed around the driver beside the port before gluing up the last side.
  3. Stuffed one port with a pillow, but I find it hard to nail down tuning exactly with the inexpensive homemade jig, though it looks close to 14 hz, which will drop some when the cabinet is standing upright, and the ports are closer to the floor.
  4. I will be building a pair, have some materials on hand for the second one now, but have to go out of the city for work so it will be some time before I complete both of them. I can certainly stuff one port and check the tuning.
  5. Added a screen shot of the impedance simulation for 16.5 cu ft net, 17.6 hz tuning.
  6. Side panels are just clamped in place at the moment, and bracing is not fully complete yet. From a quick and dirty estimate, cone excursion minima is in the 17-18 hz range. Edit: quick impedance measurement taken, tuning looks to be 17.6 hz.
  7. Ports are complete, PL max is curing, and 4 out of 6 pieces of wood are glued together, I had a good friend and AES fellow come by and help out.
  8. This is a shot of the inside of the elbow before the other lengths were added. A few coats of Duratex with sanding in between make the surface fairly smooth.
  9. Thanks! 'Respiro Del Diavolo' is the name I am kicking around for these. 😀
  10. One port out of 4 ready, second one is almost complete.
  11. Starting work on a pair of subwoofers utilizing the 8 ohm version of the DS115. Ports are sonotube, and to make them fit in the enclosure, they will have a 90 degree bend. The external dimensions of the enclosure will be 49 inches tall, 36 inches wide by 24 inches deep. Dual 9.25 inch sonotube ports will eat up about 4 cubic feet of room in the box, driver is .53 cubic feet. Bracing will be fit around the ports and the driver. External cabinet volume is 24.5 cubic feet, or 693.76 liters. Time is sparse to work on these, so they likely will not be operational until the new year.
  12. Can anyone link a video of the sound? My hypothesis is that the shorting ring or rings are loose, and moving in response to forces generated by the coil. I should check my recently purchased 21DS115 for extraneous noises before building a cabinet.
  13. Ukko Kari

    BMS 18N862

    Has anyone else noticed that US Speaker no longer lists this driver on their site? ?
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