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naaac

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Posts posted by naaac

  1. 15 hours ago, JohnA said:

     

     

    Did the 4.9 mH inductor originally have a steel hold down screw in the middle?  😉

     Try running your low-pass calcs using 20 ohms instead of 16.   The bass horn raises the woofer's impedance a lot.  Al Klappenberger showed a Belle Klipsch' bass horn doubled the DCR of a K-33-E within its operating range. 


    Ha - no it didn't. I tried adding a proper 5mH inductor in series with the 1.3mH and now the response looks much better.
    Updated woofer response in blue. 

     

    woofercomparison5.4mHvs1.3mH.jpg

  2. 1 hour ago, mboxler said:

    I was hoping you had the stock 1.3mh inductor, as that would be way too low, and would account for your measurements.  But the 5mh should have been better.

    Any way to measure the 5mh to verify it's value?   

     

    You were right! I measured it with DATS V2 and it was actually 2.6 mH - even though it was wrapped at 4.9 mH in 1954. Looks like I need to get a bigger inductor and try it out....

    C51B9546-5695-42BA-AF8D-F2503874935A.jpeg

    • Like 1
  3. So, I am slowly restoring an old set of Khorns. I just took some measurements of the latest configuration and I'm wondering if this is looking like it's supposed to. 

    Set up: UMIK 1 / REW / about 3 feet off the ground / 3.5 feet from front of Khorn / 1/6 smoothing

    Woofer: Stephens 103LX (16 Ohm, DCR ~ 10 Ohms) // mounted on slide-in motorboard, with 6"x13" slot
    Mids: University SA-HF + K-5-J
    Highs: K77 Tweeter (square magnet)

    Crossover: I built the ALK Universal crossover with Solen caps and Litz inductors on a k-500-5000 crossover board (1954). I'm using the old autotransformer on the board and the squawker is connected to the -3 and 0 tabs on it.

    Here are the measurements. Is the woofer response supposed to look like that? It looks like it's not being properly attenuated on the upper end.

     

    Stephens 103 LX 16Ohm with ALK Universal Crossover.jpg

  4. 2 hours ago, avguytx said:

    That's definitely a hot mess.  

     

    If  I read everything right, here is what I would do, personally.  

    • Pull the Pioneer woofers and sell them.  Buy some new K-33 woofers or a pair of the Crites woofers which gives you a woofer that is better suited for that cabinet.
    • Find a pair of newer used K-55 mids that will mount to the K-400 horns.  You'll see used K-55's come up in Garage Sale once in awhile, check for them on e b a y, or maybe get a new pair of the A-55 mids from Crites.
    • Buy a pair of Type A or AA crossovers, either new or used, and work with those.  There are other types that will work but I believe that's your best starting point.
    • If you have a working pair of K-77 tweeters, you might check them both with a DMM just to make sure they read the same.There are newer options if needed.
    • Do you have both top sections that can hold the K-400 and K-77?

    Bottom line is it's going to depends on how much you want to spend to get them in working order.  Also, do you have corners to put them into?   You could always build the backs on like newer versions that make them less restrictive to having to be in perfect corners and room that most people don't really have in a house.



    Also, I really want to do the closed backs mod - but I can't find any good threads about it - a lot of the photos and links are now dead. I can only find the insane 120 hour Volti Audio versions. 

  5. 1 hour ago, avguytx said:

    That's definitely a hot mess.  

     

    If  I read everything right, here is what I would do, personally.  

    • Pull the Pioneer woofers and sell them.  Buy some new K-33 woofers or a pair of the Crites woofers which gives you a woofer that is better suited for that cabinet.
    • Find a pair of newer used K-55 mids that will mount to the K-400 horns.  You'll see used K-55's come up in Garage Sale once in awhile, check for them on e b a y, or maybe get a new pair of the A-55 mids from Crites.
    • Buy a pair of Type A or AA crossovers, either new or used, and work with those.  There are other types that will work but I believe that's your best starting point.
    • If you have a working pair of K-77 tweeters, you might check them both with a DMM just to make sure they read the same.There are newer options if needed.
    • Do you have both top sections that can hold the K-400 and K-77?

    Bottom line is it's going to depends on how much you want to spend to get them in working order.  Also, do you have corners to put them into?   You could always build the backs on like newer versions that make them less restrictive to having to be in perfect corners and room that most people don't really have in a house.

    Thanks for the feedback!

    1.  I have one Pioneer woofer and 1 EV 15WK woofer. Need to figure out if I can find another EV 15 WK or if I should get a pair of K33s
    2.  Will look for used K-55s, but would like to get them up and running with what I currently have
    3. Can I still use A or AA with University Drivers and K5J horns? Should be crossed over at 4,000Hz to 4500Hz vs. 6000Hz?
    4. Will verify the tweeters - also have DATS and UMIK1 and will run some sweeps
    5. I have 1 top section for the K5Js and one top section for the K400s....thinking of rebuilding a matching pair. They are different heights and sizes. 
     

  6. 17 minutes ago, Marvel said:

     

    That's in the back chamber, probably just trying to make the volume smaller for that woofer.

     

    I agree with avguytx... although the K-5-J horns would also work, since you have the K55s for those horns. It would be a start, anyway. Getting both bass cabs the same would be the forst thing to do.

     

    Bruce


    Agreed - which crossovers should I use for the K55 / K5J / K77 combination while I'm investigating further upgrades?

    Also, I opened up the other khorn last night and to complicate things even further It has the EV - 15WK woofer...So now I need to decide if I want to try to snag another one of those on ebay.....

     

  7. Yes, I for sure have 2 Klipschorns, but they are a real grab bag of parts.

    I have 2 of the K-5-J mid range horns from 1958, and two k77 tweeters - one with the square magnet, one with the circular.
    Oh, and I also have 2 K400 horns. The only drivers for the midrange that I have are the University Drivers (K55) for the K5Js. As far as crossovers go - I have one AA and one K-500-5000.

    What's the best strategy going forward - can the University drivers handle the 6k crossovers if I make another AA?

    khornlabel.jpg.dd2d75dad29e16e1f1c91d6d62dfdf41.jpghornandtweeter1.jpg.cb22b860fd1125b09e9e795f4804c3fa.jpg

    horn2.jpg

    crossover2.jpg

    horns3.jpg

  8. Greetings,

    I recently have been gifted with an old mismatched pair of Klipschorns. One of the cabinets has a really funky ordeal going on inside.

    There is a Pioneer Dual Voice Coil 6 Ohm woofer in the bass cabinet that is wired in parallel, with each set of leads going to a separate LC filter, and then each of the filters is attached to 1/4" input jacks???? Also there's a bunch of styrofoam sound treatment glued in. Also they cut a circle in the other side of the cabinet and closed it with an identical door. What even is this? Why did anyone do this?

    Also - how do I even connect an amp to test this monstrosity out? Any help / insight would be appreciated. Do I just rip everything out without listening to it and put a Crites in there?

    Thanks!

     

    khorn1.jpg

    khorn2.jpg

    khorn3.jpg

    khorn4.jpg

    khorn5.jpg

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