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About Bacek

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  1. In Forte days I had Sun 2A3 (2x4.5W) for a week at home. I was not able to pass past 1/2 of volume knob. And Fortes are definitely less effective than KHorns.
  2. No definitely I'm not looking for simpler project. This weekend I was attending Audio Show in Warsaw. For the first time had opportunity to listen to KHorns. They are way better than La Scalas in "basement department". I was really impressed. And if Jubs are even better then this is my way. But I need to be able to move them through narrow stairs case. So that is why splits idea came to my mind.
  3. Ok, thanks for the tips. I have k31 stacked for about 4 years in boxes. They impatiently wait for their turn.
  4. I know it's really old thread but I'm puzled with similar idea. Jubille is large box, problematic to transport. But what about building a splited version and stack two single woofer boxes. It will behave same as "monolithic" two woofer version, right?
  5. It's LaScala with K55M and B&C DE120 in horn from topic. NAJDA DSP XO. Green is time aligned, blue not alligned. I tought XO point was at 5200 but I probably made mistake checking files. It looks like 4500Hz -48dBa reject high/reject low FIR slope filter. There was a longer discussion in
  6. I'm not talking about driver I'm talking only about a horn. 300hz cutoff tractrix horn for 2 inch driver is shorter by 12cm then 1 inch version. I guess it will allow to fit any 2 inch driver in cabinet capable of fitting 1inch driver horn combination.
  7. Actually I don't get it. 2 inch throat tractrix is shorter than same F3 tractrix with 1 inch throat. So easier to fit 2inch driver plus horn
  8. Not realy. Conrwalls are 98dB, tweeter is 8ohm, so 4ohm 95dBa is exactly same efficiency (+3dBa from impedance). It would not work for LaScala or KHorn but for Cornwall it may work. But probably THD will be higher with Aurum so PWK would not approve it (or he may but only with his famous BS button). Of course crossover needs complete rework in tweeter section. But actually having DE120 instead of K77 I don't fill any need for top end extension.
  9. I have single round magnet K77 to sell but probably you could find something closer to you. Not sure how much shipment from EU would cost but definitively more then from US.
  10. Unfortunately I'm in microphone modification phase (decomposed internal preamp). But off axis measurements are planned. I did not notice that sweet spot is especially wider or narrower with those than k77. But I don't believe it could be. When you are moving left or right you are changing distance from one or other speaker so time delay aspects come in play. Any way I'm thinking about another version of those, which will be almost full rectangle and without any "dead space" on front. But I guess this time I'll try with 3D printing. Its more widely available in my neighborhood.
  11. Definitely I copied Dave's mounting scheme, older one, monolithic that ALKENG was selling too. It's good idea for DIY/wooden project. I'm not aware of what exact flares Dave's horns are. Except of obvious, different mouth shape, mine are shallower (28mm deepth) as they don't have any mounting spacer, just pure tractrix flare (or sadly almost, thanks to CNC production error).
  12. Superelliptical tractrix horn for tweeter - a.k.a small rain from a big cloud. Why a.k.a. It took me several years to actually implement this idea and originally I was planing it for 400Hz horn. I started to think about it in Forte days, I was planing to build some external mid/high horn for fun. Then as replacement horn for La Scala. Original material suppose to be something else. Don't know English name but I was planing it as cast made of polymer resin with mineral filler. Friend of mine was doing round horns with it and I really liked the product. So as I said got idea maybe 5 or more years ago, I did math, CAD project and laid it into a drawer for a long time. Doing large horns is really challenging. Inspired by Dave A work on tweeters I thought why not try something much smaller fist. So I ended with small solid beech wood tweeter horn instead of huge cast resin one. OK so why Superellipse? It's fun curve. Special cases of this curve are circle, ellipsis and in the end rectangle. By manipulating basic curve parameters we can do smooth transition from circle to rectangle or in this specific case rectangle with rounded corners and all the way be compliant with Tractrix horn flare. Why to bother when we have elliptical horns? Because using same front area we can make horn with lower cut of frequency without having any sharp edges on wave path. So basically join elliptical and rectangle horn strong points. Of course it's not always desirable to have lowest cut of freq but in this case math looked good. I have created parameterized xls sheet witch which I can control how transition from circular throat changes to semi rectangular mouth. Horn is calculated for 1544Hz and has good loading from 4147Hz (strange tails but I was shooting for particular mouth size) For this particular horn for half of length it goes smoothly from circle to ellipsis and then shape starts to be more rectangular. But this is fluent and I could make it almost rect from the beginning. From math I did FreeCAD project (or actually my xls almost generates it). Then I had to find someone who will make wooden prototype. It's not so easy to find someone who wants to play with such "large", 4 items, orders, but finally I did. As always with prototype not everything is 100% correct so cut off is probably bit higher but as proof of concept it went well. I stained it little bit and painted with semigloss lacquer I decided to use B&C DE120 for it. Guess I was not reading too carefully because to use it I needed to scrap some wood from top hat to fit drivers magnet. I did some measurements to compare K77 square, K77 round in original horns and DE120 to mine. Looks fine. Green is round, red is square, blue is DE120. Don't pay attention for reference level, my mike has +3 or more dBa from 16kHz but as reference to other K77 measurements it's fine. Currently my system plays better then ever. Unfortunately I cannot say it's all because of horn/tweeter change. At the same same I went from passive to fully active system. So currently I'm using active digital crossover (Najda DSP) with 6 channel Rotel amp. Additionally to normal crossover points I did full time delay alignment for all drivers. With everything changed I really love to listen live recordings. For good realizations it sometimes gives me an illusion of being actually there at time of a concert. Now it's time for bass extension with La Scala bass reflex mod
  13. For a start I would check if your amp is not "producing" DC offset. With some amount it can heat and then destroy woofer coils. Mid's and tweeters are protected by capacitors. Woofers are not.
  14. From what I remember PWK did not liked that speaker. Wouldn't be better to build central speaker with same set of drivers you have in KHorns? You could build Corn(wall/scala) for better consistency with rest of your system.
  15. Drivers are placed vertically so if you change your position horizontally it will not affect phase on common parts. OK you can listen standing on a chair and this way probably you will have phase "conflicts" but I guess you will be hit by horn dispersion first, or 30 cm from a speaker, which is pointless too. This is for direct signals. Of course you can be affected by reflected signals but there is no sens in considering this because same thing can happen for only single/full range driver (that reflection will react with direct signal with different phasing). Not sure where we are heading with this discussion? My point is that aligning drivers (back and front) by moving them physically or "electrically" by delay is definitely measurable and affects response on xo points as long as your drivers are more then half wave length distance.
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