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Posts posted by JohnA

  1. On 8/26/2023 at 3:05 PM, Tony Dennison said:

    I am loving the Heresies, but I see talk about upgrading the speakers. I currently am only vaguely interested in this topic, but what would I, or what would be the expected gain from doing this?


    I really can't see a need for any improvement, but if someone has done it....What happened?


    Thanks in advance.




    As new as they are, I'd expect you would ruin the sound.  Ask again in 30 years.

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  2. You may, or may not need new capacitors.  If the sound is not out in the room with you, consider it.  I had a '67 H700 that did not and a '68 that did.  I have an unproven theory that speakers used regularly will not need new caps as soon.  At any rate, install high quality film and foil caps.  They don't need to cost $250 each, but spend some coin. 


    One very good update, was the K-77-F version of the tweeter with a recessed flange that placed the mouth of the tweeter flush with the front of the motorboard (no more playing through a hole).  Not only does that eliminate the diffraction of the hole, but the tweeter itself responds to higher frequencies than the old AlNiCo tweeters you have.  That new tweeter is a modification of the ceramic K-77-M the factory went to in 1980.  The -F may be hard to find, but worth it.  The factory added "Z" brackets the the -M to do the same thing for a while, but that would require enlarging the tweeter hole in your top section. 

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  3. On 8/29/2023 at 4:49 PM, Scotty Mac said:

    Good day folks, 

    a while back I started a thread in a pair of Cornwall’s (minus woofers) that showed up in my shop. Since then, I have ordered and received the K33e woofers and determined they were a Gen 1 Cornwall but was unable to find a serial number anywhere.


    I finally started at the Cornwall’s the other day, I decided I was going to give the cabs another coat of Duratech and replace the insulation. So I removed the drivers and When I was pulling out the old blankets I found the original invoice under a blanket and yes, it has the serial numbers, can anyone tell me more about theses particular speakers? 

    also, I noticed I have two different klipsch tweeters, can anyone tell me which is original or “better”…? A friend has a spare square one and would trade for my round one which would give me a matching set but, I would rather the “better” tweeter if there is even a difference?





    The square magnet K-77-M Is the better tweeter, responding to higher frequencies.  Being newer than 1979, yours should have had the -Ms. 

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  4. On 8/24/2023 at 10:35 AM, Don in Dubuque said:

    I'm needing to recone/replace woofers in 2 1978 La Scala's. I need to do the same on 2 1969 Cornwall's vertical horn. What is my best option? I'd like to keep the original speaker frames. Do I just buy 4 Klipsch K33E replacements? @ $150-160 each.

    Or has anyone tried DIY recone kits I've seen available online?

    I think recone kits are $55-60 each bucks plus the needed adhesive. Another $10-15 each Plus shipping cost?  I'd say $80-90 in parts minus labor.




    1 pair 1969 Cornwall vertical horn in Walnut. Bought from Minnesota because the price was right.






    You're in like company here!


    Your '78s are likely made by Eminence in KY and they will have proper recone kits to restore them to OEM performance.  Eminence probably will not sell to you directly.  Look for a gray ink stamp number in the back side of the cones, 15162?.  Also look for the EIA build code.  It will be 67-xxxx; 67 for Eminence and xxxx for build week and year. 


    The '69s may not have Eminence woofers, you you will need to start with the EIA code and determine who made them.  However, early K-33-Es might well be a good match for the cabinet.  compare the dimensions of your cabinets to that of mid '70s Cornwalls.  If your woofers have failed, I'd recommend ebay for vintage replacements.  If you want new, consult Klipsch to see if the current K-33-E is a good match to your cabinet. 


    There is enough precision required that I would not DIY a recone.  I say this after reconing a pair of Peavey 1504-4 woofers built for quick, easy cone replacement in the field, requiring no gluing. 

  5. On 8/25/2023 at 6:49 PM, Mr. Lou said:

    The guy doesn't seem very tech savvy. I have a multimeter so I'll have to test it. What should it read impedance wise?


    As to the tweeter working, I thought it was. It may not have been or was and when the guy transported it home something came loose or a component gave out when he fired the speakers up at his place. They hadn't been used in some years.


    DCR for the tweeter should be 7.2 to 7.5 ohms.  If they are REALLY old and rated at 16 ohms, you might see 12 to 14 ohms.


    If you can hear scratching while rubbing the leads with the meter, it is most likely good.  A 1.5V battery is good for this test, too, but be sure to rub, don't hold the leads against the battery terminals.  Tweeters don't like DC. 

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  6. On 8/27/2023 at 9:19 AM, klipschhornfan said:

    Has anyone compared Heresy I (especially with alnico drivers) to IV?  Does the latest IV run circles around the I?  I'm asking because I have a pair of H1 with alnicos.  ........ Any thoughts?  Thanks. 


    Yes, H IVs run circles around H 1s (I had 7 at one time and still have 3 in my HT system).  H IVs are much more natural sounding and better on vocals, especially.  H IVs do not need a subwoofer, though open E on a double/electric bass is down a little compared to G, but not so much you might not think the song is recorded that way. 

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  7. I'm still looking for that 50 to 60 watts/channel.  I'm driving my La Scalas with 125 wpc.  While certainly more than enough, I wouldn't want less than half for the trip through "Sweet Jane", "I Don't Need No Doctor" and "Layla".  😆 

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  8. It appears an 811A tube, often used in RF power amps, could be used in an audio power amp and may produce a 160 watt audio amp.  True?  If not, how much power could it produce? 


    I had a pair of 8 watt monoblocks once.  They were fine for most listening, but I'd really want 50 to 60 watts/channel.  Could the 811A do that?  How well would it sound?

  9. LOL!  My first exposure to Klipschorns like yours was in Nashville in the later 70's.  While looking at stuff I might one day afford, I heard a thunderstorm (Alan Parsons Project).  It was a blue sky, severe clear day.  Sneaking into the high end room, the next record up was Santa Esmerelda (disco).  I noticed my bell bottoms were tickling my ankles.  They were visibly moving to the bass drum!!!  and yet, it was not so loud you couldn't talk.  I was bit that day. 


    In my whole house I have 2 proper corners for K-horns, ... in different rooms.  😐 


    You have a wonderful gift. 

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  10. Sounds like you have a hard, bright room.


    Carpet and furniture help and should be done first. 


    Very heavy stage curtains could work, but I never found where I could buy them. 


    Look at A/C duct board.  For your place, I'd say use 2" thick duct board.  The absorption will be similar to the chart above (1.0 is like an open window, 100%).  Build panel frames from 2"x2" in various sizes, fill with duct board, cover with a thin, fine mesh, neutral colored cloth, say like a bed sheet, cover that with a coarse, burlap-like cloth in a festive color and mount to the walls where you want to reduce reflections. 


    You can build bass traps in a similar fashion.  Build a 2 x 2 box out of 2" x 2" lumber, say 4' to 6' tall, cover with chicken wire, or similar, fill sorta loosely with unfaced fiberglass batts and cover as above to make it attractive.  Put those mostly in the corners.  I'd start with 2 in the rear and make more as needed. 


    I am sure you could buy something premade.  I got my inspiration from the cubicle walls I lived in for 25 years. 

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  11. I was quite pleased with an A-T OC9 on a Decca London arm in a Thorens TD-125.  I used an Aragon outboard phono preamp.  I think you might like an OC9 in it's current editions.  It brought out much delicate detail, good or bad. 


    I still have it, but is is not in service. 

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  12. Having gone from 1 to 2 to 4 subwoofers, I'll recommend at least 2, placed near mid wall on opposing walls.  Second choice would be near the corners, but the 3rd wall may disturb the frequency response too much.  I also will recommend getting subs with 15" drivers (or larger) to minimize excursion and thus harmonic distortion.  I have not heard the 2 you listed, but there are several available with excellent performance. 


    Also, remember, if you can "hear" a subwoofer and tell it's there, it is 10 dB too loud.  You might like that, but it is not accurate. 

  13. In my experience, cables matter, some, but their differences are subtle.  One reason is your speaker cables will normally pass very little power, 1/2 watt or less, so losses are miniscule.  This is due to the Chorus' sensitivity.  However, since the cost is low (discounting my sore fingers), I use thick speaker cables, about 11 gauge.  Mine are hand made braided CAT-5E, but low resistance from 10 or 12 ga wire is most important. 


    My interconnects are moderately priced, but the preamp to power amp cables for the front 3 are silver-clad copper with tight fitting, heavy phono plugs.  I use those because I could hear a change in sound I liked.  I used those on my turntable, too.  They were about $40/meter 25 years ago.  The other line level cables and digital cables are similar, but unclad copper and 1/2 the price.  The brand is Vampire Wire, but only their connectors are available, now.  The cables are unique because the shield does not carry the signal and is only bonded at the preamp end. 


    I recommend you find similar, moderately priced cables because there is some improvement in sound and quality lasts, but beyond a point, improvement costs exponentially more money for another tiny improvement. 


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  14. On 7/17/2023 at 12:05 PM, Toby001 said:

    Did Klipsch use birch wood because it was cheap and lightweight or because it yielded the best acoustic results?

    Or does any other stiff wood do the job as well?


    Yes, and Yes.  Baltic Birch is neither light, nor cheap, over here, but it can be had in a void free "plywood", a layered, glued construct that is surely what you called multiplex.  Other plywoods can be and have been used in Klipschorns and other Klipsch speakers.  My La Scalas are made from plywood with a birch veneer on the top and bottom.  I do not know what is in the other layers.  I have read it was a void-free product made for Klipsch that is similar to home cabinet birch veneered plywood, like what I have in my kitchen (la cucina).

  15. On 7/13/2023 at 2:45 PM, Toby001 said:

    Hello everyone, thank you for your information. Do I understand correctly that it doesn't actually matter about the wood?




    Well, it matters that the visible wood is pretty.  It matters that the wood comprising the walls of the horn is stiff, and relatively smooth (vs the wavelength passing).  It matters that the wood used is economical, so we can afford the speakers.  The species and other details don't matter much, at all. 

  16. On 9/11/2022 at 4:15 PM, Gregavi said:

    I have 1 Heresy Circa 1984 that I use as a center channel to go with my 2 La Scalas. I ordered replacement caps from Digikey for the Heresy. 3 of them cost me about $16 including shipping. I replaced the entire crossovers several years ago for the La Scalas with B&K Sound crossovers. HUGE difference. I will be replacing the crappy speaker terminal also. 




    i also use a Heresy I between 2 La Scalas.  I modified the Heresy crossover to more closely match the Type AA in my La Scalas.  They are much like HIP crossovers.  I think it helps the match, but it is still a little off in the mids.  It is not noticeable to most people. 

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