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Old 26th April 2013, 11:51 PM   #1671
bcmbob is offline bcmbob  United States
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Old 27th April 2013, 01:43 AM   #1672
xrk971 is offline xrk971  United States
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This thing would be pretty cool to build a scale model in FC. Maybe 6 in driver for biggest one and 3 in and 2 in drivers with piezo tweeters. Mount in an large RC car with SLA's or lipo's with class D amps.


Where do you find this stuff? I think you showed us the underground worlds largest sub that did 110 dB at 10 Hz at 1watt/1m.
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Old 27th April 2013, 10:21 AM   #1673
xrk971 is offline xrk971  United States
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Done. They sound pretty good and were an easy build.
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Old 27th April 2013, 01:46 PM   #1674
bcmbob is offline bcmbob  United States
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Quote:
Originally Posted by xrk971 View Post
This thing would be pretty cool to build a scale model in FC. Maybe 6 in driver for biggest one and 3 in and 2 in drivers with piezo tweeters. Mount in an large RC car with SLA's or lipo's with class D amps.


Where do you find this stuff? I think you showed us the underground worlds largest sub that did 110 dB at 10 Hz at 1watt/1m.
Mostly by accident while looking for something else. This one came from searching for specs for a True Copper cap - which were used in some crossovers - that were posted on a speaker site - that had a link that was too interesting not to investigate - Whew!!

Another fun thing to try is, while doing a Google search, in the results there is usually a "Images of......." link related to the query, often with hundreds of photos and links. Sometimes you find a gem or two.
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Old 27th April 2013, 04:00 PM   #1675
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Old 27th April 2013, 06:13 PM   #1676
ryani is offline ryani  United States
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X the box turned out great!
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Old 27th April 2013, 10:26 PM   #1677
xrk971 is offline xrk971  United States
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Thank you Ryan. I had to borrow these drivers from another set of speakers to try them out. Looks like I will have to order some more Vifa's to play with.
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Old 28th April 2013, 10:44 AM   #1678
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I've put together a couple of foam core fun speakers.

The sound coming thru the foamcore at high levels bothers me.

Has any body built a FC box around the FC box with about a 1/4 inch air space between the 2? Both boxes sharing the same baffle.

Would this work?

Fill with sand instead of air? (I like air its free) A vacuum might be best but hard to achieve.

Last edited by makingmoney; 28th April 2013 at 10:47 AM.
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Old 28th April 2013, 11:03 AM   #1679
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by makingmoney View Post
I've put together a couple of foam core fun speakers.

The sound coming thru the foamcore at high levels bothers me.

Has any body built a FC box around the FC box with about a 1/4 inch air space between the 2? Both boxes sharing the same baffle.

Would this work?

Fill with sand instead of air? (I like air its free) A vacuum might be best but hard to achieve.
Yes, it will work. Sand would probably work but might be a mess. You might try what I did with plumbers' putty descibed in post 1650 here Foam Core Board Speaker Enclosures?
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Old 29th April 2013, 01:12 AM   #1680
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Quick update on the spiral cornu progress. I used the existing design as an underlay and did a first pass at the spiral using arc sections (see pic1, blue highlight). Then I mapped the clothoid (hyperbolic) over top of it. It turns out to be pretty close once you use the right part of the clothoid curve (see pic2, orange highlight). The cool part about the equation is that the wall curvature is now totally smooth. Seems close enough to me - what do you think?
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File Type: png cornu-equation.png (67.4 KB, 158 views)
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