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Modified Edgarhorn Titan II's Update
162.207.20.19 |
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Posted on October 13, 2021 at 16:10:33 | ||
Posts: 816
Location: Detroit Joined: August 17, 2007 |
My old friend and retired builder with an Architect Degree constructed the A frame so I would mount and TIME ALIGN the Salad Bowls to woofer well within 1/4 wave at 500 Hz. About 1 inch vs. the required +/-6.78 inches. the tweeter is in the same plane also. So after 2 coats of Oil Based Spar Urethane over the last few months, I finally installed this 2.1 setup in my workout room in the basement about 10.5 feet apart in corners. I could not find a Tweeter to match the unobtanium one that Dr. Edgar used, so I used the best tweeter I know of, which I had a hand in developing. A custom machined Crotch Walnut Tractrix Tweeter Horn by Dave Ault with B&C DE-120 (neo magnet) driver is doing the job. Only the Seismic Subwoofer remains unmodified. Updating the woofer driver to a 4 ohm Eminence Kappa 15C, allowed for and additional 2 db of output with the same drive voltage as the JBL 2220 cited in his 2007 schematic, which was the latest I could find. Turns out that modeling both in HornResp, I got the same rolloff at 500 hz. WITHOUT the 2.5 mH choke that the good Dr. needed on the JBL. So I left it out for the Eminence. This was a real bonus, so now only 2 capacitors and 2 resistors are used. the subsequent measurements proved the simulations correct. I used a -6 db L-pad instead of a -6.8 db one that he called for on the JBL 2441, for which I purchased brand new Aluminum Diaphragms. After curving/measurments, I ended up with a larger capacitor on the Tweeter because it's about 6 db less sensitive than the Fane Tweeter he used, 106 vs 112. I use a Yamaha CX-A 5000 Pre Pro to drive a Class D chip amplifier with 75 Watts per channel. The YPAO room EQ does about a 4.5 db boost at the high end to compensate and make it FLAT to 16 Khz.while the rising resoponse of the driver to 20K takes care of the rest. From a total systems perspective, I'm very close to what he had in 2007, even though mine were built in 2003. It's the most Micro Detailed, most revealing system I've ever heard in that room, but I think the wider dispersion of that tweeter does a "side wall splash" of the highs, which may require some absorption temporarily. But instead of that, I had a Eureka moment yesterday, just found ordered a pair of new bullet tweeters on Ebay, made by Ciare in Italy, that have 110 db sensitivity. This brings me closer to the original and I hope they eliminate the need for Digital PEQ boost and the need for wall absorbers. We will see what happens in a few weeks, as my goal is to have a narrower dispersion in the Horizontal while raising the sensitivity, as to NOT require as much PEQ from the Room Correction in that range. So basically, I'm 95% there with my design goal. In the meantime, I'm listening to all my test music. It sounds absolutely GLORIOUS as is in the sweet spot and I'm very glad I made the investment in money and time! But like all my fellow audio geeks, if I can "shave and grow" a little here and a little there to make it as good as I can without EQ, then I'll do it. |
RE: Modified Edgarhorn Titan II's Update, posted on October 14, 2021 at 05:28:20 | |
Posts: 816
Location: Detroit Joined: August 17, 2007 |
Thank you for the nudge. |
+1, posted on October 15, 2021 at 11:02:08 | |
Posts: 4769
Location: Minnesota Joined: April 24, 2002 |
! |
RE: Modified Edgarhorn Titan II's Update, posted on October 16, 2021 at 12:48:28 | |
surprised that you missed it, but he's RIP this isn't the official obituary at the link but a nice tribute |