justinsweber Posted October 16, 2010 Share Posted October 16, 2010 24"X24"x24" inside... but this babby is built for abuse. 3/4" maple inside, 1/2"baltic outside. and fully fully braced. I may build new split cornscala's with K401 horns to use extra parts for just save for a quick minute to aford the Selenuim route. Front ports are fixed. the Motor baord is just for the 15" driver. Quote Link to comment Share on other sites More sharing options...
justinsweber Posted October 16, 2010 Author Share Posted October 16, 2010 4" risers with 1/2" tirm on top to keep them in place. Quote Link to comment Share on other sites More sharing options...
justinsweber Posted October 16, 2010 Author Share Posted October 16, 2010 different ideas then Ive seen for braces... I like.. the 45deg brace will reduce the volume some... which is a good thing. Quote Link to comment Share on other sites More sharing options...
Pete H Posted October 17, 2010 Share Posted October 17, 2010 Nice work! What does your internal volume end up at when you calculate all the bracing in? Quote Link to comment Share on other sites More sharing options...
greg928gts Posted October 17, 2010 Share Posted October 17, 2010 That's a nice looking build. Greg Quote Link to comment Share on other sites More sharing options...
pocket.change Posted October 17, 2010 Share Posted October 17, 2010 Any thoughs of hanging a curtain behind the driver w/8 cu. ft? Would this be considered a open baffel w/port? Quote Link to comment Share on other sites More sharing options...
justinsweber Posted October 17, 2010 Author Share Posted October 17, 2010 The braces will knock it down quite a bit... least I hope. Internally its 23.75" X 23.75" X 23.75" 23.75 x 23.75 = 564in sq. 564 x 23.75 = 13396 in cu = 7.75cu ft before braces and shelf. Looking at VAS ratign for 15" drivers Kappa 15C I think 6.5 - 7ish should be fine. I have used Bob Crites 15" in a cab of 6.8 and sounded wonderfuly. The bracing is pretty extensive. Im open to how best to cal the braces volume. There are 3 45deg braces that go long the edges... ~3" spread. Then there is the blocking... the front motor board. The cross brace... etc. Its at the finisher... wont get back for 2 weeks. All in all im super excited for this... My Origonal Cornscala's are in the living room and these will be for the guest room. One easy way to reduce vol would be to add a panels to the sides 22"x 22" x .75" 22 x 22 = 484 484" x .75" thick = 363 (the sides) 2 panels of 363 = 726 cu in 13396 cu in - 726 cu in = 12670 cu in. = 7.3cu ft or One easy way to reduce vol would be to add a panels to the sides 22"x 22" x .75" 22 x 22 = 484 484" x .75" thick = 363 3 panels of 363 = 1089cu in 13396 cu in - 1089 cu in = 12307cu in. = 7.1cu ft What is the rational for the hanging curtain? How large? Where would you place? Quote Link to comment Share on other sites More sharing options...
justinsweber Posted October 17, 2010 Author Share Posted October 17, 2010 I have used vol of 6.8 cu ft and sounds wonderful. What do you all think ... 7.3 or 7.1 cu ft? Adding the pannels ? Quote Link to comment Share on other sites More sharing options...
greg928gts Posted October 18, 2010 Share Posted October 18, 2010 A brick? Bottle of water? LOL Spray foam? Greg Quote Link to comment Share on other sites More sharing options...
justinsweber Posted October 19, 2010 Author Share Posted October 19, 2010 Not sure what to make of the above response... In all seriousness. Anyone have exp with cabs 6.5 cu ft and above? Should I really consider adding pannels to reduce internal vol? Quote Link to comment Share on other sites More sharing options...
Guest " " Posted October 19, 2010 Share Posted October 19, 2010 Not sure what to make of the above response... In all seriousness. Anyone have exp with cabs 6.5 cu ft and above? Should I really consider adding pannels to reduce internal vol? your question is dependent on know what the resonate frequency of the driver is that you are using and what goal tune do you have for the vented ports. you need to run the numbers thru an online calculator. you may also want to run the numbers using an 18 driver and see which results in less cabinet dike plugging. Quote Link to comment Share on other sites More sharing options...
greg928gts Posted October 19, 2010 Share Posted October 19, 2010 Not sure what to make of the above response Sorry, I thought you were looking for ways to reduce the volume of the cabinet. The first two were meant to be funny, but spray foam might work well, without adding a lot of weight. Greg Quote Link to comment Share on other sites More sharing options...
PrestonTom Posted October 19, 2010 Share Posted October 19, 2010 I guess I missed something. What makes you think the volume is too large? At some point, I hope you will take SpeakerFritz's advice. Quote Link to comment Share on other sites More sharing options...
justinsweber Posted October 19, 2010 Author Share Posted October 19, 2010 Volume too big... after doing some reading about port config vs volume. Im not sure how to use to calcluators... Something I need to learn. I did call Eminence and spoke with their tech support. He believed that with the port config I have and a volume of 7.3cu that this is too much volume for a Kappa pro... that the driver will reach its mechanical limits. His sugestion is to decrease the volume. Eminence's website sugests a max vol 6.5cu... Ive used 6.8cu last time and sounds great. When the Caninets are back from the finisher. I will take down exact demensions, and begin to calc internal voume, acoounting for braces and alike. If still too large... 6.5cu =/- 10% I will add material to get be back to the median. Does anyone know the volume of a K33 than for all the help. Bit worrysome that the cab may be too big... I did most of the wood working at a friends shop... so Im attached to these and dont want them to be lemons. I need lemonaid. Quote Link to comment Share on other sites More sharing options...
justinsweber Posted October 19, 2010 Author Share Posted October 19, 2010 Not sure just how big... but the Eminence OMEGA PRO-18C goes up to 800hz and seems to like a bigger cab. Doesnt seem like a realistic option. I havnt seen a Cornscala with an 18" LF driver yet. Quote Link to comment Share on other sites More sharing options...
justinsweber Posted October 19, 2010 Author Share Posted October 19, 2010 other views. the port mouth mimics that of a Cornwall Quote Link to comment Share on other sites More sharing options...
pzannucci Posted October 22, 2010 Share Posted October 22, 2010 I must have missed what driver you intending on using. You need to get the parameters from that to decide box size and tuning. If you are using Crites's cast frame 15", you could add 50% to the size and tune high to mid 20's and get some very deep extended low end. Most bigger woofers with bass extension (low fs) and higher efficiency will require a very large box. 7 cu is a good starting point for extended bass. Usually only goes up from there. Quote Link to comment Share on other sites More sharing options...
Guest " " Posted October 23, 2010 Share Posted October 23, 2010 "Doesnt seem like a realistic option. I havnt seen a Cornscala with an 18" LF driver yet." your box is 24X24X24 hmmm kp-480 is 24X24X24 (18" driver) I don't think your making cornscalla boxes. Quote Link to comment Share on other sites More sharing options...
justinsweber Posted October 25, 2010 Author Share Posted October 25, 2010 I decided I was not skilled enough to change the portsize ect to make this cab sing with 7cu ft. Adding 3/4" to most/all sides will bring me back to Bob Crites origonal size 22.5" X 22.5" X 22.5" ... I Braced the Crap out of it.. so its a bit smaller... Im Est 6.6cu ft before braces... Similar to my other Cornscala's and shoudl sound great. Im in process with the wood work... lots of small panels... so its will be a week more or so. That said. I ordered my 2nd K401 horn... will use 2 refurbed k55 drivers, Selenium HM17-25 and D220ti 8ohm. Bob Crossover ofcourse. I had the K55s and 1 K401 so this was a logical choice. Quote Link to comment Share on other sites More sharing options...
jorjen Posted October 25, 2010 Share Posted October 25, 2010 Justin, I just saw your PM from September regarding my CornScala motorboards, sorry I missed it man. Anyway, check out my reply and let me know. Jordan Quote Link to comment Share on other sites More sharing options...
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