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About WMcD

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  1. Sorry if I created a miscommunication. I was writing about sending the items to the museum in Hope; not Larry's living room. WMcD
  2. The museum did not want things shipped previously. They were setting up some protocol. Are things in place now? Id like to ship the paperweight and some photographs. You can message me if you like. WMcD
  3. The AL-4 crossover is in the pinned list crossovers on page 4. As Larry said, it is more evolved. The bass part is not particularly complicated but the mid and treble parts are much more complicated than earlier models. You'll note that overall the more modern crossovers for the K-Horn, LSII, and Belle all have a strong family resemblance. WMcD
  4. Interesting reading attached. It seems that Shinall's design (or at least one design) actually pre-dated the Belle. Maybe HDBR can expand on what he wrote. WMcD www.audioasylum.com - re-shinall-stil.pdf
  5. IMHO, these various Klipsch speakers have very good bass performance down to the mid-30 Hz. Speakers from other manufacturers often don't go that low. They are not boomy, chesty, bass heavy, or unbalanced in themselves. OTOH, because of their good performance they can excite room modes which might make them sound boomy, etc. Other speakers might not sound boomy but it is because they just don't have performance "down there." I suggest it is necessary to play with placement to even out the room-induced peaks. Corner placement is a good starting point. If not satisfactory you can move them laterally a foot or so, or into the room by a foot or so. Perhaps a bit more will be necessary. WMcD
  6. And Patrician IV Part 2-2.pdf Patrician_IV_Part_2-1.pdf
  7. And also Patrician_IV_Part_1.pdf Patrician_IV_Part_2.pdf
  8. The bass horn could be an EV Patrician IV. The plans show a front hatch. OTOH the mid horn shown might be from a later incarnation. The midhorn comes off the back of the diaphragm and the tweeter horn comes off the front. FWIW I believe this is the PA horn shown on M*A*S*H television with the tweeter horn missing. Attached is what I have on the Patrician IV. WMcD Patrician_IV_Assembly.pdf Patrician_IV_DIY_Manual.pdf
  9. This says that issues with driver polarity was observed and made consistent in 1958. https://2d73e25b29782b6d6766-9c8af5cbfef16739445bc76457060528.ssl.cf2.rackcdn.com/KhornTimeline_635116436015580000.pdf I'm not too surprised at the source. One fellow on the forum installed a Max Potter P-trap. His daughter recognized the change with no prompting. WMcD
  10. To say the obvious: a car cell phone usb charger can be helpful. I have never used an inverter but can only image one could keep your laptop charged. WMcD
  11. He is somewhat referenced in Toy Story
  12. The only thing which makes sense to me is that we're seeing that the bass and the mid are pretty much in phase until the bass is reversed in polarity. Then there is “destructive interference” when polarity of the bass unit is inverted. This is of course limited to the frequency range where they are both sounding. Your graphs are in that range. The extent of this is a bit surprising but not beyond the range of possibility. The K-400 is strong down to 270 Hz and then there is some modest output below. The K-Horn bass bin has some modest output above 400 Hz. The crossover filters are not very steep and so do not cut off either unit very much in the critical region. WMcD
  13. Is that the factory tweeter?
  14. There is also the notion out there that “conical” horns have fewer modes, or internal reflections. Subjective reports are that they are less “honky.” There is an issue of nomenclature when it comes to “tractix.” In a pure mathematic form it seems to have an area which is exponential or hyperbolic at the small end, and then more like conical as it expands, and then a wider flare at the big end – and the cross-section is round. Nonetheless, people make mid horn of various shapes which are not purely tractrix. Roy Delgato describes his initial designs as a “modified” tractrix. We can’t extract very much information from that except that it is not a pure tractrix. Saying what it is not doesn’t tell us what it is. The waters are muddied because Klipsch took out a trademark on “tractrix.” As far as coverage control, DB Don Keele did a lot of this. He also credits PWK’s K-5 from decades before. Some tractrix look like his work. I really like the sound of the “tractrix” on the Forte II, and Quartets (I’ve not heard a Chorus II). Now there is a Forte III which uses an improvement by Roy where he adds “mumps” in the mid horn. My overall suspicion is that Roy has created a mid horn reducing modes (reflections) and having good directional control. I dislike subjective reports, even my own, because anyone can say “this or that.” With modern time domain waterfall plots we may see some objective evidence.
  15. Imagine the fun you could have with this. Of course you'll want to build a duplicate. I can give you a schematic I made up and you can compare it to an AK-4. You could even make up a unit switchable between the AK-4 and this (which should be an AK-5) configuration. WMcD