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Posts posted by JohnA

  1. 6 minutes ago, KT88 said:


    Honestly, I'm not the type of guy who has to be right. On the contrary, I am very glad that you have clarified it. But on the other hand, do you know if the oil in the old Klipsch capacitors is completely harmless?


    No.  But it should be no worse than motor oil.  You wouldn't lick that off your fingers. 

    • Like 1
    • Haha 3
  2. 4 hours ago, KT88 said:


    I am completely with you on this point, svberger. There is only one objection. As soon as you see the slightest liquid it is dangerous for your health. The old caps contain PCBs which was used for cooling. @deang will know if the old Aerovox caps Klipsch used are affected. PCB is extremely highly toxic and it spreads in the air when you see droplets of it.


    Not true.  PCB is used in high voltage xfmrs and the like to retard fire and heat breakdown; it is nearly inert and almost will not breakdown.  It is difficult to get it to burn in a coal-fired furnace at 3000F.  It was not used in the motor caps Klipsch put in the Type AA.  I doubt the older boxy caps used in the Type A had it either.  It's pretty expensive stuff. 



    But a leak means replacement is needed.  The oil conducts heat and improves the insulation of the dielectric.

    • Like 3
  3. 21 hours ago, svberger said:

    My journey continues. Have a pair of '77 La Scala's that came with the original metal can caps on the AA's. Liked the sound as is and resisted refreshing them. Then I gave in, bought some new Type A crossovers with Sonicaps from the company  who shall not be named(went with A's because I disconnected the zener diodes and so figured no reason to get the AA's). Had them in for several months, no issues, liked them just fine. Not much difference after they seemingly broke in some. I also decided in that time that when @deangwas up and running I would order some new, Klipsch approved crossovers from him.


    Last night I was bored, so threw in the old crossovers again, and man if they don't sound really good. I figured they would be a little duller then the new one's, but they're not. All the detail and high end is still intact, but there is a nice warmer overall presentation that seemingly was missing with the newer X/O's. Probably just in my mind, and probably my 65 year old ears doing their thing. But I like what I'm hearing, and think I'll leave these in there. At least until I'm able to get the approved variety's in there. 


    Over and out.




    Not all of the old xovers I've had needed to be recapped.  I'm sure the AAs do sound better than the As.  The tweeter section adds needed EQ and attenuation to the K-77.  In a home setting, the -M tweeter should not need the zener diodes.  If you still have original K-77 tweeters, I'd reconnect them until you can install the -Ms ribbon lead diaphragms.  The K-77 is rated at 2 watts continuous/20 watts peak.  The -M is rated at 5 continuous/50 peak.  Change the diaphragm and you'll get the higher rating. 


    Better yet, Try to find a pair of K-77-Fs(?) that flush mount the tweeter mouth to the front of the cabinet.  or send me a PM. 

    • Like 1
  4. 6 hours ago, Zen Traveler said:

    I dunno about that.  Actual "facts" are facts in the Information Age we live in. I also trust sources that actually have responsible Editors involved and have to abide with FCC Regulations. I admit there are problems with algorithms that are troublesome, but as I mentioned above they are trying to make changes on some platforms. As of now these are free market platforms although I do see areas where it may be prudent for government intervention. 


    Trouble is, no one abides by those rules and the "government" is not allowed to intervene by the First Amendment; not that the Constitution has meant anything to the government in the last 21 years. 

    • Confused 1
  5. I can't tell if I posted in this thread, or not.  It's grown too long.  I was both surprised and disappointed at the lean/bright sound of my new H IVs when I got them.  Not at all what I remembered from hearing them in Hope.  So I set about "exercising" the woofers with Dub-step while the Loudness was on and the bass at max for this old receiver.  That way I could pump the woofers and not be annoyed with the door shut.  At 48 hours, there was a marked difference (more bass,more natural sound).  After 4 days, they didn't seem to change much.  Now I don't use a subwoofer with them at all.  Just looked.  It's unplugged.


    I must admit to their break-in and with chagrin that I have stated many times break-in was a myth.  I don't remember my old Marantz and Boston A150 speakers changing that way.  That was so long ago, maybe they were floor demos. 

    • Like 6
  6. On 9/30/2022 at 10:10 PM, deang said:

    Pileophile. Piles and piles of stuff. Someday we’ll hear:


    ”Hi everyone. Well, I’m in the hospital. I was crushed by my Home theater system. I shouldn't have flown the MCM’s.”


    “I know I haven’t posted in a few days, but I just now got back from the kitchen.”




    LOL!  I simplified.  Down to only 5.0.4 and only 2 Heresy IVs in my computer room. 

  7. On 9/28/2022 at 7:58 PM, Chief bonehead said:

    Tough one because I wasn’t the one that did the redesign. I will tell that I was asked to listen to comparison not knowing which was what and I ended up picking the al3……mind you after playing about 30 of my ref cuts. 


    I would say something similar, but it didn't take me that long to notice a resonance/howl in the common range of a French Horn that I found very annoying when listening to 1986 AL La Scalas in the same room with '81 AA La Scalas.  My brother has the ALs, now.  😁

  8. It is not my intention to start a kerfuffle, but, ....


    Now that things and time has passed, is there any possibility of examining the records that NMSU posses and perhaps copying some?  It is a shame there is animus between groups that both want to preserve the legacy of Mr. Paul and do it honestly.  Could another party mediate?  Perhaps an explanation of the issue, depersonalized, would help.   

    • Like 1
  9. 19 hours ago, Peter P. said:

    We know that woofers can be damaged if they're over-driven at low frequencies, especially frequencies below their 3dB cutoff.


    So why don't more manufacturers protect their woofers electrically with bandpass filters?


    It may not be a perfect solution but I expect it would help.


    Some Pro "subwoofers" have high pass filters.  The box tends to limit the LF excursion well enough, but at only 6 dB/octave.  Most music had very little energy below the 41 Hz low E of a bass, further limiting the need for a woofer high pass filter. 

    • Like 1
  10. On 8/30/2022 at 10:11 PM, the real Duke Spinner said:

    Can any modern speaker really best this ??

    Do not offer conjecture if you have never heard them

    Acoustics have not changed since this Pinnacle of design

    Modern speakers just have different design constraints


    I'd say almost all.  I would not choose them over my old La Scalas, never mind K-horns of Jubilees.  I have found them boomy with recessed vocals and pretty hot somewhere around 4k.  Certainly no more low bass output than a La Scala.  


    Mr. Paul compared the frequency response of the La Scala to a "well known theater speaker" in a paper published on the "new" La Scala.  I have always suspected it was the A7 and it falls well short. 


    I used the A7's horn and driver in a home-made system similar to my La Scalas.  That treble horn/driver has some nice attributes and it's smooth sounding, but lacks the shimmer the K-77-M gives. 



    • Like 2
  11. I read an paper discussing foam around the mouth of audio horns to absorb reflections/diffractions.  Since many foams are short lived and too thick, I used 3/4" felt.  Clean and easy and it's been there since 2000 or so.  Other things made more audible difference, but I'm still a little subject to audiophoolery.  🙃

    • Like 2
  12. On 7/31/2022 at 3:51 PM, BT Raulerson said:

    ...... I'm no audiophile but to me it sounds like the speakers are starving for power.  There is almost no bass response at all.  I used a little bluetooth tube amp and ran some modern 'music' from Youtube and turned the treble down and the bass all the way up  and they would shake the floor with the amp I made.  Running them on just the HK receiver there is almost no detectable bass.  The speakers are very close together and about 8" from the wall.  .......


    The very opposite is true.  People run Cornwalls with 2 watt tube amps.  You have a room placement issue.  They should be at least against the wall and as least as far apart as the listener is back from them.  There could be other issues with the room, too.  Cornwalls do not lack bass unless a woofer failed.  Check and turn off all EQ in the receiver and set the speaker size to "Large".  Set the receiver to "No Subwoofer" and 2 channel only until you add other speakers.  If there is an adjustment, set the speaker impedance setting to 4 ohms so the amp will deliver the current the 4 ohm woofer needs. 


    Listen a while before changing the caps to be sure they need them.  Do not use cheap caps; each one should be a film and foil cap and you should expect to spend $70 each, or more, to provide the quality the speaker deserves.  Metalized foil caps will sound gritty. 


    I will recommend lining the openings for the squawker and tweeter with heavy felt to absorb reflections off that edge.  Perhaps unneeded, but lining the woofer opening won't hurt. 




    Unless your F-I-L intends to so with surround sound, a stereo receiver would be a better, and simpler, choice. 

  13. I've been using braided CAT5E for speaker cable for 22 years(!). 


    Must be wore out by now, what with knocking electrons out of their orbits for that many years!  😁


    I am currently listening to a Technics SA-300 from '79 that I had recapped.  That's probably all yours needs.  The SA-200 I bought in college is in the garage driving a pair of Auratone 5CTVs. 

  14. 39 minutes ago, Crankysoldermeister said:

    It's still a Mustang, but ...


    "There's a type of electronic fuel injection that was very popular in the 1980's, 90s, and two thousands, that used a manifold air pressure (MAP) sensor to determine the mass flow rate of the air going through the engine. Typically, when the engine would go to wide open throttle, the amount of air pressure inside the intake manifold would be equal to the barometric pressure. If the exhaust system were to be improved by removing a simple cast exhaust manifold and replacing it with a performance header, the air flow rate will go up. As the MAP sensor will still be reading barometric pressure, the computer system will have no way to detect the extra air. In this way, the engine will run leaner and could damage the exhaust valves or the tops of the pistons."


    LOL!  Speed density EFI could also adapt using the O2 sensor and Intake Air Temp sensor, so it was not so dire as that.  Add in that the WOT A/F ratio was 12 to 12.5:1 and the best power mixture is almost always 13.2:1, a *little* leaning is a good thing.  BTDT with mt '87 Mustang GT.  I measured EGTs on each bank to get an independent (cheap) look at WOT leanness.  


    Off topic, so I'll also say, it's still a Mustang.... 

    And I have decided metalized polypropylene caps sound subtly gritty.  😉

    • Haha 1
  15. The top one is NOT Klipsch.


    The other one is an HIP, for Heresy Industrial Ported.  The woofer is an E-V EVM-12L or Eminence copy and gets to 102 dB/w/m in the midrange.  So, the crossover network ("Balancing Network") is a slightly Modified Type AA that was used on the K-horn/La Scala/Belle Klipsch and the squawker and tweeter are the same as the Big 3.  They are quite bright, but excel outdoors and in Huge rooms. 

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