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jwgorman

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    Heil Air motion transformer for Cornwalls

    in Technical/Restorations

    Posted

    I love the sound of ribbons, usually and I always was mesmerized by the sound of Heils back in the late 70s. I think the "speed" of compression drivers might be easier to integrate with AMTs than cone mids!?!? Just a theory, but so far so good. I can say that after playing Pink Floyd's The Wall at more than moderate volume, these guys have no issues, show no strain and bring out very subtle details. I wonder how they would fare at 1.5KHz 4th order? This isn't a slam dunk, but I don't think I'm too far off with this baseline (1-2db down on the AMTs seems to be about right in my room) 

    Claude has been working on his Super CWs for a while and I liked the idea of moving the x over point on the mids down to 4k. I think that helps a lot. 

     

    Heil Air motion transformer for Cornwalls

    in Technical/Restorations

    Posted

    ESS is having a sale on The Great Air Motion Transformer tweets.  Their 4ohm, 96db/w/m rating made me think they might do well on Cornwalls. So I bought a pair of them, a pair of the large Dayton AMTs and the smaller Aurum Cantus Aerostiction tweet. For the last week I’ve been listening to them. 

    I have the mids and tweets crossed over at 4k, LR2.  I unplugged the stock horn tweet and put them back in the cab. 

    The Daytons were my least fave. The Aurum Cantus were very very sweet. The ESS sound the best to me. Plus I think I could play them loud crossed at 2k LR2. 

    The ESS can give that Magneplanar ribbon type detail and dipole presentation only they can play really loud. I think I pad them a db. 

    I think there’s a lot of improvement to be made in the crossover as I just used an online calculator and went from there. 

    I can sometimes get the Maggie imagine thing going on where the image just sort of hangs there. 

    https://essspeakers.store/collections/black-friday/products/the-original-great-ess-heil-amt-air-motion-transformer™

     

    49D2EEE4-FA4C-40E4-8496-D35622894B89.jpeg

    • Like 1

    Let’s say you wanted to build a new CF-4

    in Technical/Restorations

    Posted

    7 minutes ago, moray james said:

    do you really like the D’Appolito configuration? Personally I don't because it only works from the centre sweet spot and by the time you are at the end of the couch it gets messed up. I much prefer a WWT configuration as used in the KG series and most other speakers. Further a larger cabinet is going to permit deeper response which would be nice. I agree with Peter Z. start from scratch and also would add that the larger the horn you use the better. What ever you do have fun.

    To be fair I’ve not spent much time with the WWT configuration. My experience with CF-4s was very positive. Driven by decent Luxman SS gear they had a smooth and unique klipsch voice and they had really good “audiophile” (I’m holding my pinky out) imaging. I attributed what I was hearing with D’Appolito as I’m a Hertiage guy. But that is really my only data point with that config.  

    I was using the CF-4 as a reference and I can certainly add volume to the cabinet to make the F3 lower and I can brace the daylights out of the cabinet too. The goal is to remake a unique Klipsch design and improve where feasible.  

    But now I have to consider WWT... dang it 

    Thanks for the input you guys. 

    Let’s say you wanted to build a new CF-4

    in Technical/Restorations

    Posted

    1 minute ago, pzannucci said:

    The lower you can get the crossover, the better the integration in a true D'Appolito configuration as it has specifics of crossover frequency (size of the wavelength) and the position of the drivers to allow for timing consideration of the wave from each driver.

    Yes that makes sense. If I went with the Faital 142 horn, they recommend 800HZ as the crossover freq. I know the Cornscala D crosses this horn lower than that. Even crossed at 700HZ I could get the HW321’s 2k spike heavily attenuated with a 3rd order x-over. 

    Can Roy be bribed with Scotch? Asking for a friend. 

    Let’s say you wanted to build a new CF-4

    in Technical/Restorations

    Posted

    15 minutes ago, Shiva said:

    If you want to build a better Epic,  take a look at what Jeff at JTR speakers is doing with his Epic copies.   His 215-rm, same basic footprint as the CF4's, but with 15" drivers and made into a 3 way, using a coaxial center.  

     

    http://www.jtrspeakers.com/noesis-215rm.html

    I’ve never seen them before but man they look badass. That’s really cool. I’m thinking about a constraint of around $2k for the pair for my project. Plus Scotch for my friend who makes perfect cabinets. 

    • Like 1

    Let’s say you wanted to build a new CF-4

    in Technical/Restorations

    Posted

    Maybe I should have called it Big D’Appolito. 

    2 hours ago, pzannucci said:

    Another thing is that in an MTM configuration (WTW), you have to pay close attention to distance to center for the crossover and height of horn since any up and down off center or incorrect crossover point to distance can create nulls.

    Yes.  This is where the heavy lifting comes in. I can cross the HF146/Faital horn at 700HZ and I can use a calculator to tune the box and come up with a generic 3rd order x-over, but I forsee a lot of trial and error. Unless I went electronic and established a baseline that way I suppose. I’m out of my element with this part.

    Let’s say you wanted to build a new CF-4

    in Technical/Restorations

    Posted

    I am considering building a super CF-4.  I’m thinking similar size and performance and to the extent possible perhaps improving performance. 

    I have access to a cabinet maker with cnc saws so I think the cabinet part would be relatively easy. At least for me. 

    The Ciarre HW32s look sort of interesting as do the Faital Pro 144 or 146s on the Faital horn. I have no experience with the Ciarre drivers though. I just threw those out  there as something that might work.  Maybe someone else has thought about this. And I know there are some people who are very knowledgeable about the CF Epic series. 

     

    Most Beautiful Speaker Veneer?

    in 2-Channel Home Audio

    Posted

    3 hours ago, avguytx said:

    My ribbon mahogany DIY Belle's.  ;)

     

     

     

    Ok....I'm biased.  ha

     

    20171224_110752-1024x824.jpg

    Did you apply the veneer, and if so, I don’t suppose you could reveneer some ‘86 Walnut Cornwalls in that finish? Very nice. All these posts have me thinking my veneer is dull and in need of some work. 

    • Like 2

    Any one else running a Technics SL1200G?

    in 2-Channel Home Audio

    Posted

    3 hours ago, JohnJ said:

    The 150MLX  - - - nuff said?

    I discovered everything wonderful said about that thing online and wanted and got one of the leftovers last year. Was not compatible with that AT-LP5 (lack of adjustaments). When I got the latest tt went straight to the AT33PTGII. Beside taking two months to get it off the cc, I have had a big smile since.

    How do you run your AT33PTG, with respect to VTA? 

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