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About JohnA

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  1. Not really. The resistor and inductor are simulations for the primary winding's wire resistance and inductance. I suppose it could also be simulated by a dozen small resistors and inductors in series. I look at that as an unnecessary complication to the demonstration that the autoformer presents a node between the 2 caps.
  2. Y'all are missing the point. He asked about 2 genders 😉 of music, and symphony and organ were not part of it. I admit there is great power, emotion and impact in symphonic music. It all occurs on side 2 of the 1812 Overture, if I can stay awake through side 1.
  3. "E" just means export. Likely sold overseas in a PX. I would get the Heresy Es. Their bass response should go deeper and be better balanced for indoor use.
  4. This has become a MONSTER thread!
  5. Yes. The Chief told us most (all?) of the filters were 2-pole. But that does not mean 12 dB/oct for the network. With contouring, the slopes are much steeper, a la the Type AA's 21-ish dB tweeter high pass.
  6. Significantly less harmonic distortion. When I curved the set I built, harmonic distortion exceeded the fundamental below 100 Hz. I was outside, but I can't believe I ever exceeded 100 dB. I wanted to install a pair of Bob"s cast frame K-33 replacements, but never did. I gave these to the church and was not the only person running them. I wanted bulletproof.
  7. This, ..... and every other thing Sheffield Lab does. http://sheffieldlab.com/item.php?item_id=38&category_id=2017 Loreena McKennitt https://www.amazon.com/Book-Secrets-Loreena-McKennitt/dp/B000J233SK/ref=sr_1_6?crid=2OYMMLVHFWOUP&keywords=loreena+mckennitt&qid=1579838316&sprefix=loreena+mckennitt%2Caps%2C379&sr=8-6 Diana Krall https://www.amazon.com/Look-Love-Diana-Krall/dp/B00005N9CV/ref=pd_sbs_15_1/141-5919356-8271730?_encoding=UTF8&pd_rd_i=B00005N9CV&pd_rd_r=0bb6380a-8925-4f67-85ee-defab51976fb&pd_rd_w=YfEr7&pd_rd_wg=M8LRX&pf_rd_p=bdd201df-734f-454e-883c-73b0d8ccd4c3&pf_rd_r=GMY4AZWP5NPD840VNWX1&psc=1&refRID=GMY4AZWP5NPD840VNWX1 Jane Monheit, especially with David Benoit https://www.amazon.com/s?k=monheit+benoit&i=popular&ref=nb_sb_noss Buy as much as you can find on DVD-Audio.
  8. Robbie, There is no reason not to try the Type A circuit, but I believe you will be much happier with the Type AA tweeter section.
  9. WOW! this takes me back over 40 years! I had to stew on it a while. This is how I think the circuit should be analyzed. The autoformer/transformer is an odd duck and requires a different approach. I believe it acts like a voltage source on the low voltage side. The high side is then a series resistor (the wire resistance) and inductor (the coils in the transformer) to ground. Seen this way it becomes plain the squawker and tweeter caps are not in series. Current and voltage drops can then be calculated in each of the 3 loops. It must also steepen the slope of the squawker high-pass. this has been a mild curiosity for me over the years. I'm glad you all forced me to figure it out. Ain't lernin' fun!!!
  10. Your cap values are too far from the OEM values to see much difference at 400 Hz. You want to run several frequencies, too, like 50, 100, 400, 800, 2000, 4000, 10k.
  11. I don't know. I don't have that kind of test equipment. It would be a good test. I randomly touched the squawker horn one day and noticed it tingled. After a little research (that dipped into thermodamnamics) I decided Dynamat was the ideal way the absorb those vibrations. I thought the result was well worth the effort, and burned fingers. I believe several others on the forum liked the results, too. I could not detect any change when I put rope caulk on my K-700s.
  12. 😀 Not with a node between the 2 caps. The autoformer makes a node that separates the 2 caps into 2 *filters* in series.
  13. Wow! Just heard about the Audioquest wire in the video. Carbon impregnated insulation? Carbon is a conductor. Polyethylene (PE) should be a long lasting insulation, but nitrogen injected? What for?
  14. With the reported extra output from the Kappa 15C from 200 to 400+ Hz, you don't need the back corner reflectors. La Scalas have 2 real flaws. The bass horn is too short (no deep bass) and the side walls vibrate at high levels. Bracing the sidewalls or building them from 25mm plywood are solutions. Build your braces a little off center to avoid just doubling the resonant frequency.
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