Lime Twig Posted August 19, 2010 Share Posted August 19, 2010 Before I go cutting ply I would love to know how to calculate the flare rate. I've seen drawings of other horns where they "unfolded" the horn and showed its overall shape. Has anyone seen one of these for a LaSca? Or are there any other ways folks can think of to calculate how to get the final folds right? Quote Link to comment Share on other sites More sharing options...
kg4guy Posted August 19, 2010 Author Share Posted August 19, 2010 Started a second large bin today got most of the cuts done just have to cut the back and sides. Quote Link to comment Share on other sites More sharing options...
Guest " " Posted August 20, 2010 Share Posted August 20, 2010 "Or are there any other ways folks can think of to calculate how to get the final folds right?" thats funny... Thats not how these things we designed. need an economy speaker....a pair from 1 sheet of ply would do it...lets call it a heresy need a middle of the road speaker....a pair from 2 sheets of ply would do it...lets call it a cornwall need a higher end speaker...a pair from 3 sheets of ply would do it...lets call it a lascala need a top of the line speaker...a pair from 4 sheets of ply would do it....lets call it a khorn. the size of the lascala exit is a direct function of the size that would result by using 3 sheets of plywood. the funky dog house shape was simply the shape that would fit a woofer within a 3 sheet ply lascala. if you take out the two dog house sides and just used a triangle, the woofer would not fit. later in life, folks measured the lascala, and determined it was a 53hz hi pass horn. it was not designed to be one. you can make the cabs bigger and they will work...you can make them smaller and they will work...taller...wider...etc. Quote Link to comment Share on other sites More sharing options...
Lime Twig Posted August 20, 2010 Share Posted August 20, 2010 the size of the lascala exit is a direct function of the size that would result by using 3 sheets of plywood. the funky dog house shape was simply the shape that would fit a woofer within a 3 sheet ply lascala. if you take out the two dog house sides and just used a triangle, the woofer would not fit. later in life, folks measured the lascala, and determined it was a 53hz hi pass horn. it was not designed to be one. you can make the cabs bigger and they will work...you can make them smaller and they will work...taller...wider...etc. This is the best news I've gotten in a while, Fritz,. I'm always happy to take the time to re-learn a bit of math, a bit of horn theory, but eventually I hit a wall and would rather make sawdust. Thanks for the encouragement to just jump in! Quote Link to comment Share on other sites More sharing options...
pocket.change Posted August 20, 2010 Share Posted August 20, 2010 For Grin's, Look at some drawings of establisbed designs. After building more than a few folded bass bins, I've found the tighter the fit and longer the path to the wall (within reason) makes for a more acceptable bin. Case in point, the difference in the bass bin volume of the 3 EV designs. Patrician.. 18" driver in a big set-up worked well in a accordingly large room but in a typical home environment is way too much speaker. Georgian.. 15" driver in a relatively smaller bin & room worked well etc.. KD2... 15" driver in a tightly fitted bin (same aprox. size as a K-Horn, may be even smaller) with 3/4" HDFB or plywood ends up being close to toast (for me). No overpowering resonance and it's a listenable system that can be enjoyed endlessly sans fatigue, which says a bunch for PWK's capability as a audio design engineer. Quote Link to comment Share on other sites More sharing options...
kg4guy Posted September 3, 2010 Author Share Posted September 3, 2010 Got the second bin done today. Quote Link to comment Share on other sites More sharing options...
kg4guy Posted September 3, 2010 Author Share Posted September 3, 2010 Side Quote Link to comment Share on other sites More sharing options...
kg4guy Posted September 3, 2010 Author Share Posted September 3, 2010 Side #2 hit it with a round over bit on all the corners just need a woofer and I'm in business. Quote Link to comment Share on other sites More sharing options...
MechMan Posted September 3, 2010 Share Posted September 3, 2010 Very kewl. Stack em and sit a K-402 on top.[Y] Quote Link to comment Share on other sites More sharing options...
kg4guy Posted September 4, 2010 Author Share Posted September 4, 2010 I have a pair of JBL 2360A horns and 2445J drivers that might work nice also.[^o)] Quote Link to comment Share on other sites More sharing options...
Guest " " Posted September 4, 2010 Share Posted September 4, 2010 I have a pair of JBL 2360A horns and 2445J drivers that might work nice also. might...you got to be kidding....if I had those horns I would not think of using anything else.... Quote Link to comment Share on other sites More sharing options...
kg4guy Posted September 4, 2010 Author Share Posted September 4, 2010 I have been using them on my Cornscala dbb's however I need to order 4 new woofers for them as I borrowed them for other projects. Quote Link to comment Share on other sites More sharing options...
kg4guy Posted September 4, 2010 Author Share Posted September 4, 2010 I started out with Altec 511B's on the dbbs and then went to the 2360A's Quote Link to comment Share on other sites More sharing options...
kg4guy Posted September 7, 2010 Author Share Posted September 7, 2010 Went with black inside and I hit it with poly on the outside. Quote Link to comment Share on other sites More sharing options...
kg4guy Posted September 10, 2010 Author Share Posted September 10, 2010 The twins are done just need to add HF section. Quote Link to comment Share on other sites More sharing options...
kg4guy Posted September 17, 2010 Author Share Posted September 17, 2010 Yes out of the back yard and going into the house. Quote Link to comment Share on other sites More sharing options...
Daddy Dee Posted April 26, 2013 Share Posted April 26, 2013 kg4guy, missed your project when you posted in 2010. impressive. congrats on the very cool project. Quote Link to comment Share on other sites More sharing options...
ricktate Posted April 27, 2013 Share Posted April 27, 2013 I missed this to, not sure how. Your wife must be an angle to let you bring such things in to the house,better make a trip to the ring store soon....lol Rick Quote Link to comment Share on other sites More sharing options...
kg4guy Posted May 2, 2013 Author Share Posted May 2, 2013 Yes it the same basic woofer chamber as the La scala's but I followed John Allens version. Quote Link to comment Share on other sites More sharing options...
Carl_Huff Posted May 2, 2013 Share Posted May 2, 2013 kg4guy, Have you ever measured the frequency response of this version? I am curious how different it is from the stock LaScala. Quote Link to comment Share on other sites More sharing options...
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