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WMcD

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About WMcD

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  1. Sound proofing first floor

    I enjoyed reading JohnA's comments and agree. For the record: There are two different issues which might get confused. The first is the treatment of rooms to affect how sound bounces around within. Absorbers and diffusers (reflectors) are often used. This is not soundproofing though. The second, soundproofing, is keeping the sound pressure from getting out, or in. For example: In my humble apartment there is little transmission though the walls floors and ceilings because they are six-inch reinforced concrete. It is not a matter of sheet rock and studs, just massive sealed barriers. OTOH, voices pass though the ventilation system. I hear vague conversations and a microwave oven cycling. People passing though the outside hall can be heard because of the lightweight door (no mass) which has a gap at the bottom threshold and no sealing at the edges. It is just a matter of sound passing though gaps. It is interesting to watch old James Bond movies with Sean Connery. We see that Bond passes from Moneypenny's anteroom into M's office (where he is criticized for using a .22 Beretta and ordered to use a Walther .32. IIRC. Smile. There is a double door system, between the anteroom and the office presumable to prevent sound transmission. But ventilation for M's pipe, it could compromise soundproofing and security. WMcD
  2. Sound proofing first floor

    Sorry you didn't get a response on this. One reason you didn't, IMHO, is that soundproofing requires a lot of work on the rooms and you seem to have ruled that out at a starting principle. Sound is transmitted when the wall in one room is physically connected to the wall in another. The sound, to some extent, is transmitted through the studs (therefore a space between studs is usually recommended). The same applies to ceilings and floors. This is mostly bass. Thin doors do this too. A real soundproof room is a room within a room. Another means of transmitting sound is simply air passages. These include gaps in sheetrock, ventilators, electrical outlets, non-airtight doors. If there is a stairway up to the second floor that is going to be an effective passage, just as when you yell downstairs, "Honey have you seen my purple socks?" One thought is that it might be a smaller production to soundproof a bedroom on the second floor than a living room on the first. As you can imagine, this sort of work is better done during initial construction. Metal cage? That is for electronic signals, not audio. Let us know what you find you can accomplish within your restraints. You really need an architect to advise you. WMcD
  3. University MID-T - for a 1954 Klipschorn?

    It is possible that grandfather used a 1939 Bogen unit in the car.
  4. Plans for 1956-57 Khorn Housing

    Jim K, I hope someone will adopt these. The dumpster is too horrible fate. There was a fellow here heading a youth group in SF restoring LaScalas. Does anyone have that thread? My thought is that he and his protégés might like to work on them as a project. In any case, Jim's inquiry should be moved or reposted in the garage sale section. WMcD
  5. Klipsch kmc 3 remote not working

    One thing is to test whether the remote is actually sending the IR signal or not. Use a cell phone camera to view the IR transmitter while pushing a button. I.e. aim the remote at the camera lens. You should see the IR LED blinking the signal as a white illumination on the cell phone screen. Test this on any known good IR remote too, just for fun. Amaze your friends. It is remarkable that the cameras are sensitive to infra-red and display it as white. At least mine does. WMcD
  6. University MID-T - for a 1954 Klipschorn?

    I can't resist. The coupe didn't have roof space for the horns though.
  7. University MID-T - for a 1954 Klipschorn?

    I suppose that was a Bonnie and Clyde type car. Supposedly Clyde wrote Henry Ford to praise it. Gee, it is a big car, like an SUV today. Also lots of horsepower in the car and sound system. Grandpa was a man not given to half measures. The Beach Boys sing of the 1932 couple version of the car as a Little Duce "1932" Coupe with a V-8 flat head mill (flat head because it had side valves and not overhead valves). Still, it will walk a Thunderbird like it's standing still. At least when it is ported (intake runners) and relieved (exhaust) and stroked (increase stroke) and bored (increased bore). Smile. to Didn't Casablanca have a car with horns on top to announce the Germans are coming to Paris? I don't know if Bogen was making horns in those days or ever. However, such horns appear in a catalog from 1935 Obviously grand dad would fit in well on this forum. WMcD
  8. University MID-T - for a 1954 Klipschorn?

    Can anyone identify the model and year of the car? Smile.
  9. University MID-T - for a 1954 Klipschorn?

    I really should follow Ben Franklin. He said: It is better to keep your mouth shut and let people suspect you are a fool, than to open it and confirm their suspicion. But . . . I do get the impression your grandpa was a big fan of the Khorn. The MIT unit is certainly a close cousin of the original. Maybe he purchased it on the open market as upgrade or simple replacement. He later went to a crossover upgrade from Klipsch. In reviewing the catalogs I get the impression that suppliers of drivers for home units assumed buyers would be using a non-horn loaded woofer and a tweeter. What we see of midrange drivers were for PA use and in a separate section of the catalogs. Of course PWK had his K-5 horn mid and used the University we see in your later photos. Being a perfectionist, he added real horn loaded tweeters. The sources of audio were changing with FM live, TV live (which was FM) and LPs (when?). So sources were catching up to the performance of the K-Horn. In those years, EV and University and perhaps others had similar horn loaded tweeters we see above. One big change was the EV T-35 and EV-T350 with the added Avedale (sp?) phase plug which we see as the distinctive hemispherical button. Early T-35s did not have it. It kicked up response above 12,000 Hz. This, rebranded and QCed became the K77. WMcD
  10. University MID-T - for a 1954 Klipschorn?

    It is certainly a midrange horn driver. The threading on the pipe-like end appears to be the standard type. It could be used to a great number of midrange horns. I've looked at the Allied Electronics catalogs on-line for the subject years. Some University raw units are listed, but neither of these. If there is something to be inferred from that I don't know what it is. The Klipschorn timeline states: The first three-way Klipschorn incorporated a Jensen RP203 tweeter. This tweeter came from the famous Jensen G-610 Triaxial 15" driver and required considerable negotiations with Jensen. It was not until mid-1952 that all Klipschorns were three-way. A two-way Klipschorn with response to 12Khz was generally adequate for program material up to that time. The University MID-T- 4401 replaced the Jensen unit as the tweeter of choice later in 1951. It was bugging me that the photo of the MID-T showed a driver which was smaller than I thought it should be as compared to the fingers.. At least now we can say the MID-T was probably provided by the Klipsch factory. This is a wonderful question you've posed. I hope people who are better informed than I can shed some light. WMcD
  11. Moving Klipschorns

    Seriously: Plan to make three trips. One for the two top hats, one for each bass bin. Have at least one good buddy help. In my experience the problem is trying to move too much at once. Here is a funny Laurel and Hardy. It goes a bit long but is worth watching.
  12. DIFFERENCES IN SQ & AMPS, ETC.

    As I recall: at one of the early pilgrimages to Indy there was a demo of a tube amp which had a switch to introduce negative feedback or not. Yes, there was a difference. As I recall the dreaded negative feedback improved the bass. Maybe deeper. This was on K-Horns as I recall. I was a bit miffed because it was a small room and we were packed in tight. Not a relaxed listening situation. My thought was that a real test would have been with gear to test the frequency response at the output of the amp and maybe acoustic output of the speakers. Perhaps Klipsch Inc. did not want to explore that thorny thicket. At another pilgrimage, the host was supposed to set up and ABX test between Monster Wire and lamp cord. But then for unstated reasons, the Monster Wire was not used and braided CAT-5 wire was used in its place. I was alone in the test room and listened to music and could not hear any difference. Though I really think that the complexity of music and variations from bar to bar makes this sort of thing very problematic. Then I sought to avoid such issues and tried pink noise. I heard no difference in the wires. Sometime earlier I ran FR curves on lamp wire and my home K-Horns using an LMS system. At the amp versus at the speakers. No difference except for one data point out of hundreds where there was a difference at the limits of resolution. FWIW i had Forte II in my office fed by small Sony receiver which probably has Tripath chips. Just wonderful in all respects. WMcD
  13. You can find technical information: https://community.klipsch.com/index.php?/topic/28996-technical-information-on-industrial-lascala/&tab=comments#comment-243753 I'm quite sure the information is the same for the split version. Also please note the AES reprint at the bottom. ee WMcD
  14. I agree with Don. We had this sort of question with a K-Horn (?) years ago. I too think it is the autotransformer picking up some magnetic field. rotating the box on three axis might find a null position. There is some electrical device in the home which is causing this. Opening the circuit breaker for each room should help track it down. The on-off switch on some devices do not disconnect the primary winding of the power tranformers -- they just go into a standby mode. The device might be in an adjacent room on the floor or above or below or even outside.. Battery chargers for cordless devices (weedwackers, drills, cordless screwdrivers), dimmers, and outdoor low voltage lighting have reputations for radio frequency noise. Is the electrical wiring in conduit or just Romex type? It might not be causing the signal but it could be radiating it. WMcD
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