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About JohnA

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  1. Hello Rodolpk6, Those are real La Scalas that have been modified to be pretty. If the sound they reproduce is crisp, and sounds forward or out in the room, in front of the loudspeakers, the crossovers are good and do not need to be modified. If they sound reserved or polite, replace the capacitors. Use good film and foil capacitors. ALK crossovers are very good, but run the tweeters hotter/brighter. I found the original Type AA sounds better and changed back to them. If your woofer, squawker (midrange) and tweeter sound clear without audible distortion, you are wasting money when you replace them without cause. I haven't replaced mine and don't recommend it. I have replaced my tweeters with Tractrix tweeters that I like, but others dont. I am still running my original 1981 K-33s and K-55-Vs. In order to get the most performance out of the bass reflex modification, a high-pass filter and low bass equalization are required. Forum members who have published test data from their bass reflex modification showed it made only 3 or 4 dB difference without the EQ and filter and that difference was not always better. I think it is a waste of effort. It is better to get a good subwoofer and leave the La Scala woofer alone so it can reproduce music with the least distortion. From DeepL: Bonjour Rodolpk6, Ce sont de vrais La Scalas qui ont été modifiés pour être jolis. Si le son qu'ils reproduisent est net, et les sons en avant ou en arrière dans la pièce, devant les haut-parleurs, les crossovers sont bons et n'ont pas besoin d'être modifiés. S'ils semblent réservés ou polis, remplacez les condensateurs. Utilisez de bons condensateurs à film et à feuille. Les filtres ALK sont très efficaces, mais font fonctionner les tweeters plus chauds/plus brillants. J'ai trouvé que le Type AA d'origine sonne mieux et j'ai changé pour eux. Si votre haut-parleur de grave, votre haut-parleur de médium et votre tweeter sonnent bien sans distorsion audible, vous gaspillez de l'argent lorsque vous les remplacez sans raison. Je n'ai pas remplacé le mien et je ne le recommande pas. J'ai remplacé mes tweeters par des tweeters Tractrix que j'aime bien, mais d'autres pas. J'utilise toujours mes K-33 et K-55-V originaux de 1981. Afin de tirer le meilleur parti de la modification du bass reflex, un filtre passe-haut et une égalisation des basses sont nécessaires. Les membres du forum qui ont publié des données d'essai de leur modification du bass reflex ont montré qu'il n'y avait qu'une différence de 3 ou 4 dB sans l'égaliseur et le filtre et que cette différence n'était pas toujours meilleure. Je pense que c'est un gaspillage d'efforts. Il est préférable d'obtenir un bon caisson de basses et de laisser le caisson de basses La Scala seul pour qu'il puisse reproduire la musique avec le moins de distorsion possible. J'espère que cette traduction fonctionne mieux que Google.
  2. Standing waves can't be avoided. Every room dimension has a resonant frequency or 2 (first and second, 1x and 2x the wavelength and sometimes more) The trick is to avoid integer multiples of the other room dimensions. 8' x 8' x 16' would be one of the worst rooms. Another trick is to build walls with highly different lengths, say 11' x 8' x 19' Non-parallel walls work well, I did that in my old house (to much derision from the x). Finally, diffusers and absorbers can help by breaking up the reflections that reinforve each resonance. You will hear them when walking through the room and finding places where a note is loud and another place where that note is quiet.
  3. Hi ILI, In my working life I was an Environmental Engineer and did a little PCB work. Since yours are leaking, and are from 1972, they should be replaced. Do not be alarmed. Caps that old MAY contain PCB oil. LARGE exposure to PCB oil for a long time can be a health hazard. PCBs were designed to be inert, non-reactive oils and they do just that, nothing, and will barely burn, good for electrical stuff. Use good gloves to protect your skin. They clean-up easily with Hexane, unleaded gasoline/petrol will do just fine, but do it outside. Dab and wipe the spilled oil with a petrol saturated cloth and dispose of the waste and caps per your local disposal rules. Where I live, household waste is exempt from special rules (quantities are small). No finger licking! 😂 http://www.nepc.gov.au/system/files/resources/378b7018-8f2a-8174-3928-2056b44bf9b0/files/anzecc-gl-identification-pcb-containing-capacitors-information-booklet-electricians-and-electrical.pdf See page 4.
  4. Hi ILI, Type C is the right crossover for 1972. Rebuild it as it is. The next change was to Type D in 1974 and it was designed to be brighter. I don't like it and have modified my similar Type Es back to Type C configuration. The original capacitors were paper and foil in oil motor-run caps. They are tough to find in the correct sizes, but if you can find them, use them. Otherwise, I recommend film and foil caps. I have been partial to Musicaps. Solen metalized film caps are pretty good and are made in France, so you should be able find them easily.
  5. I think it looks like a great alternative.
  6. My x-wife pronounced it clips, just to anger me.
  7. I have one or 2 SACDs. Don't hear anything special. 24/96 DVD-A is about equal to my Thorens with AT OC9 moving coil. 24/192 DVD-A will just best it.
  8. That is the first "0" serial number I've ever seen. Normally, "1" is the leading character. If the crossovers are AB-2, it/they has been upgraded. What color is the squawker? What shape is the tweeter magnet. AB-2 was originally paired with a black K-55-M.
  9. I thought those things were legend. Seen the patent dwgs/sketches.
  10. Last week I did another DVD-Audio disc search. Spent hours looking at bands I'd never heard of, reading reviews of the recordings mostly in any format other than DVD-A and bought 2. The first is truly a gem! Its the Klipsch Tape Reissues, Vol II. The Joe Holland Band is recorded live. The DVD-A version is breathtakingly real. Ear Candy for a jazz lover! It's dynamic. The cymbals are perfection. Skin drum heads. Air sounds with the clarinet. All those evenings in bars listening to the real thing quickly come to mind, especially parts of Naw'lins. Sit back with your favorite evening beverage and enjoy!
  11. That's a stiffener. Glad it helped. Now, use that as a shelf, glue and screw similar material to the stiffener and run back to the rear panel. Be sure they are just long enough to touch the rear panel and screw the back panel the your new "braces". Using that thin material won't reduce the interior volume much, so I don't think it will change the tuning.
  12. This sounds all monked-up. A pro 10" with an Fs of 55+ will not make a subwoofer. Floor monitor, sure. Don't transmission lines need a Qts around .25 and an Fs also around 25? Not that far from a Klipsch K-33-E. Why would you want to mix 2 such disparate designs? If you want a high efficiency horn subwoofer, there are many available designs with proven performance. If you want La Scalas, buyt some.
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