Mike Dubay Posted September 5, 2011 Share Posted September 5, 2011 I have been planning an upgrade to my Cornscalas. A couple of things I want to address. 1) With my current Selenium D250X midrange the system does give some distortion at higher listening levels. 2) Improve the visual impact of the system. As you can see my Cornscalas give a somewhat monolithic view. Quote Link to comment Share on other sites More sharing options...
Schu Posted September 5, 2011 Share Posted September 5, 2011 is there a question in there somewhere? Quote Link to comment Share on other sites More sharing options...
Mike Dubay Posted September 5, 2011 Author Share Posted September 5, 2011 I put together some nicer drivers. The selenium 408ti driver for the midrange. This is a 2 inch driver, ti diaphragm, and about 4 db more sensitive than the D250X’s. Got these used at a good price from a forum member. Quote Link to comment Share on other sites More sharing options...
Mike Dubay Posted September 5, 2011 Author Share Posted September 5, 2011 Nope, no questions as of yet! Quote Link to comment Share on other sites More sharing options...
Mike Dubay Posted September 5, 2011 Author Share Posted September 5, 2011 And the popular selenium 220 ti for the tweeter. Quote Link to comment Share on other sites More sharing options...
Mike Dubay Posted September 5, 2011 Author Share Posted September 5, 2011 To improve the aesthetics of the system the horns will be exposed with no upper bin or speaker cloth. The wood horn is a 200 hz horn. With the left and right side clipped by 1.5 inches will give an 2:1 (W:H) aspect ratio and will match the 25 inch width of the bass bin. The horn was build with oak laminated plywood and flexible 3/8 inch plywood. The horn was finished with an exterior spar varnish. This helped fill in the voids on the flexible plywood and gave an even honey tone to the different plywood. I also noticed that the flexible plywood became more rigid after the 5 coats of spar varnish. Here is the horn fresh from finishing. Quote Link to comment Share on other sites More sharing options...
Mike Dubay Posted September 5, 2011 Author Share Posted September 5, 2011 Front view. Quote Link to comment Share on other sites More sharing options...
Mike Dubay Posted September 5, 2011 Author Share Posted September 5, 2011 Here is the version 1.0 of my Cornscalas, with out the top cabinet. The blacked out midrange just does not get it for me visually. Quote Link to comment Share on other sites More sharing options...
Mike Dubay Posted September 5, 2011 Author Share Posted September 5, 2011 Here the mount for the tweeter is attached. Quote Link to comment Share on other sites More sharing options...
Mike Dubay Posted September 5, 2011 Author Share Posted September 5, 2011 The 'baby cheeks' horn for the tweeter. Quote Link to comment Share on other sites More sharing options...
Mike Dubay Posted September 5, 2011 Author Share Posted September 5, 2011 The drivers mounted. Quote Link to comment Share on other sites More sharing options...
Mike Dubay Posted September 5, 2011 Author Share Posted September 5, 2011 The sheer size of the D408ti compared to the D250X. Quote Link to comment Share on other sites More sharing options...
Mike Dubay Posted September 5, 2011 Author Share Posted September 5, 2011 The top cabs were removed from the orginal Cornscalas and replaced by a 25 x25 sheet of plywood to sit the horn on. Here is the finished right channel. Quote Link to comment Share on other sites More sharing options...
Mike Dubay Posted September 5, 2011 Author Share Posted September 5, 2011 The overall view of the system from the listening position. Quote Link to comment Share on other sites More sharing options...
Mike Dubay Posted September 5, 2011 Author Share Posted September 5, 2011 The new midrange and tweeter fixed a few problems. They do exhibit less distortion at higher levels, but I’m letting the drivers run in before any high level listening. The reduced distortion appears to be most pronounced with vocals. The highs are also more clean and detailed. The midrange is also more accurate in the vocal region; the D205X gave to some extent a sound like the vocalist had maybe a nasal tone or speaking into coffee cup tonets, esp at lower vocal frequencies. The 408 ti reproduced vocals much more accurately in an effortless manner. Currently the cross over is a simple 2nd order cross at 5,000 Hz between the tweeter and squawker with no attenuation applied just yet. I have a 50 uf blocking capacitor for the squawker for protection from unintended DC spikes. The sensitivity of the 408 (111 spl) vs the 220 (109 spl) is pretty close. A quick check with test tones with my spl meter showed equal response from the tweeter and the squawker, so will leave it for now. What attenuation settings do other members use for either a 408/220 combo or the 405/220ti combo? I do exhibit some hearing loss in the upper frequencies, so maybe reducing the squawker about 2 db might be the trick. I’m going to let my drivers and crossovers to continue to run in before making changes. I’m very happy with the looks of the speakers now. This winter will continue with some cabinet work, replacing the dark colonial cabinet and the pine dresser with matching euro style birch cabinets. Quote Link to comment Share on other sites More sharing options...
kevinmi Posted September 5, 2011 Share Posted September 5, 2011 Looks good Mike! I've been curious to hear the babycheeks lens with those drivers. I installed some L-pads on my tweets to try out different attenuation on the fly, but mostly have been listening to them a 0db. Quote Link to comment Share on other sites More sharing options...
angusruler Posted September 5, 2011 Share Posted September 5, 2011 they are much more impressive with the top cab removed....nice! Quote Link to comment Share on other sites More sharing options...
Mike Dubay Posted September 5, 2011 Author Share Posted September 5, 2011 Thanks Kevin. The "Kevhorns" were my inspiration for the exposed mid-horns. Quote Link to comment Share on other sites More sharing options...
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