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No.4

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Everything posted by No.4

  1. What’s that hiding in background to the right?
  2. I threw this plan together tonight for the port. Front exit would be solid walnut all cut at 45 degree. Essentially three ports all combined to equal the port area of 22.5" x 3 3/8" x 9 1/2" deep. this section would be constructed first. the insides of the ports would be veneered as well. I have a good deal of walnut veneer scrap from other projects so there is no investment there. Am I correct in thinking the ports for Cornwall IV are three separate "channels"?
  3. Thank you. I would like to take all the credit, but this is the result of a little creativity and a lot of input from forum members over the years. And of course, the inspiration of the original klipsch designs.
  4. The center of the mid horn will end up right around 40” to 41”.
  5. @MookieStl great info. I spent a good portion of the afternoon reading through threads all over the web about port location. The consensus seemed to be that location was not critical in a reasonably sized enclosure. There were opinions or preference but as Mookie said most could not tell the difference. This was of course internet research down while cooking and eating so take it with a grain of salt. I am very interested in the ports of the Cornwall IV though. The one point that did pop up consistently in most threads was port noise. The shape of the elements of the port was important. Looking at the CW4 ports exits you can see the 45 degree bevel. Much different than the exit of the previous versions. I would assume the port entry also has smoothed/rounded edges. I would like to explore this further. Anyone have CW4s that would be willing to measure the opening height and width, of course the depth of the the port?
  6. Both great suggestions. Taking a quick look at the Eminence site, they recommend round ports for most of the iterations published. Now I need wade through the rest of the data and make a second potential design. I am going to design around the higher placement of the kappa as in the drawing. Port placement will be the next task. With furniture in the room near the speakers I don't know if ports at the bottom of the cabinet to couple the bass to the floor will be as effective as ports just below the driver.
  7. These will be going in a living room so the height should not be an issue. They will have to compete with furniture etc. in the room. A little extra height would help. They are still not as tall as k-horns either. If I do encounter an imaging issue I can always angle the top half a little to aim them at the listener as well. I will hunt around for some calculators. I would like to stay as true to the Cornwall internal dimensions as possible. But if the driver location is going to mess with the function of the port, I may have to rethink the port. Or, I am just overthinking it😵‍💫
  8. This is the top half setup that I will be using. I replaced these components with the heil with wings double stack above the La Scala clone bins. the bass bins will be built to match the top half. I just cant let these parts sit in the closet any more. These will end up as the mains in my living room. the 18" depth should be a little more living room friendly too. I will do some more updating to the drawing as I get time. I have the Kappa about 3 inches from the top of the cab which is much higher than the original design. Any comment on the location good or ill is welcome. I am hoping to start on the motor boards soon.
  9. Adding a better but still not great drawing.
  10. The one I used is the version that is rated to 105db. It matches the rest of the drivers really well, and sounds excellent.
  11. This build was supposed to begin this time last year (2020). I decided to work on another project at the time and just never got around to finalizing the design and making some sawdust. Hopefully everyone is up for a build thread, and not tired of Cornscalas. These will be going in my living room and have to be designed around a foot print requirement. These will be splits so they need to match the tops that I already have completed as well. This thread will be primarily a discussion of the bass bin construction. The exterior foot print is 25.5" wide by 18" deep. all of the panels on 4 sides and top and bottom will be 1.5" thick. Probably a combination of ply and MDF. These will be heavy! I have everything to complete this build except for the veneer, which will be walnut. The following is the component list. Eminence kappa 15C woofers B&C DCM 50 midrange drivers Eliptrac 400 horns Dayton PHT1-6 planar tweeters ALK ESN500 and ESN5800 networks Miles of assorted cabling and binding posts Utilizing online calculators and digging through old posts I have collected the data used to generate all of my dimensions. the consensus seems to be, that the dimensions need to be close but a little give or take should not make too measurable a difference. The starting point is the overall internal dimension. 10641.5 cubic inches. This was scrounged from posts by JWC. Using 10641.5 as a baseline and the internal footprint dimension of 22.5" x 15" (25.5" x 18" external dimension subtracting 1.5" thickness for all of the panels 3") 32" H x 22.5"W x 15"D = 10800 cubic inches internal dimension. (This will allow for allow for some loss due to internal bracing) Port measurements 22.5" wide by 3 3/8" tall. The port baffle board will be 9 1/2" deep. Assuming these measurements will make music, I just need to decide where to locate the kappa on the front baffle. My instinct tells me I should try to push it a high as possible and keep it close to the midrange horn, just not sure how much. assuming my design is sound, the placement of the woofer is where I need some guidance. I will add my highly technical drawings (done by hand, on paper) in the next post. If anyone sees any glaring errors in my design, please call it out.
  12. @MC39693 I have been able to spend a considerable amount of time with this preamp since my last posts about it. It has seen almost daily use since I finished it a little over 2 years ago. I am glad to report it is still very transparent to my ears. In the time that has past I have added a DAC to my system and a DSP for my speakers. The pre plays well with every device I have connected to it. My system is at a point where source material quality is very apparent. Poorly recorded material cannot hide. My most recent audio project has been my version of the double stacked heil project. I have been working on a 300b amp for a while as well. Unfortunately my diy audio projects have been idle for too long. A delicious steak and a good red is still tempting. I may have to alter my dinner menu now that I have steaks on my mind.
  13. When you swapped the amps and the issue went away did you try swapping them back to the original configuration?
  14. Truly. Can’t wait for an update!
  15. Very cool project!! I would love to see more as it progresses. MEH’s are on my shortish audio project list.
  16. I’m not sure how important it is for these to look perfect, but...would you consider new veneer? It’s easier than most people think, and they will look brand new.
  17. I opened this at work before it disappeared..... fastest back button in the Midwest here! my caption is based off old school ad copy. “Sounds better than it looks” (doubtful!)
  18. Nice work! Planning out the veneer process was one the more difficult parts of my La Scala build. I veneered the doghouse and the inside panels of the top, bottom and sides before I assembled them all together. All I had to do was the outside and front edges. I had some waste inside the doghouse, but not much. Hats off to you for cutting and fitting the pieces. So far it looks perfect. for those considering rehabbing la scales or belles you might share some tips on how you are getting that perfect fit.
  19. That’s a good find! My local thrift stores....not so much.
  20. Small footprint, super cool. what is your winter project? 🙂
  21. I am not an expert on this either. I have been using digital lately just because I have been so curious. I have been a holdout up until recently. I am using an iphone and iPad for a source through a Schiit modi Into my system. The modi will support the file sizes that amazon hd and ultra hd broadcasts. MQA is supposed to compete with ultra hd I believe, but don’t quote me on that. I started looking into MQA because I am back and forth about upgrading my DAC and during that research, many reviewers would bring up whether or not the particular DAC I was looking at would support MQA. I do not need MQA necessarily, but you definitely do. As to your above settings when you do get an MQA supported DAC you will probably want to have all three of those options selected. That is assuming you are using your AVR to control volume. The third setting will bypass all processing internal to your computer and let the DAC do the work which is what you want.
  22. As I understand it MQA is unique to tidal and not all DACs support MQA files. Does yours?
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