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Posts posted by Deang

  1. Hi Jim,


    Sounds like you are just saying the current version of the PD5-VH can’t play as high as the older single phase plug versions. However, their current data sheet is exactly the same as the one that they’ve been using for as long as I can remember. At any rate, I have no reason to doubt your word. It’s interesting.  

    As for the collapsing verticals - if that’s not true, then Klipsch misinformed me. Person shall remain anonymous unless they prefer to reveal themselves and clarify. There is always the possibility I misunderstood.  


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  2. “K-55-M hotter”. 

    That was addressed in a very long thread that eventually got moved into the historical section. That myth was busted by John Allen, and I confirmed it with Jim Hunter. Only the engineering samples were hotter, when the production samples arrived, they were the same sensitivity as the K-55-V. That doesn’t mean the frequency response was identical. People get confused by this. You can have variations in frequency response, but still have the same sensitivity. This is why it is important to use the right driver with the right network. This was also confirmed with Jim Hunter and Roy. Mike Boxler was kind enough to confirm all of this with measurements because he was tired of watching me agonize over it. 

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  3. 18 hours ago, OO1 said:

     the specs of the 70's -80's  K-55V with the original Atlas diaphragm indicated that it extended to 6KHz  whether single or dual phase plug  and so does the K-55M  , but the K-55M was hotter , and we all know that the newer 2001 K-55X , PD5VH  including the newer D-20GB diaphragms only extend to 4100Hz .

    The old K-55-V reached 6kHz because of the collapsing verticals of the K-400 horn. Like Mike pointed out, it’s doing it, but it’s not happy about it. This is the primary reason Roy lowered the crossover point. The driver is beaming, and not providing a smooth power response (polars aren’t lining up).


    On the Atlas spec sheet for the PD5-VH, they tell you that the frequency response was taken using a plane wave tube, not on a horn - and that if you want to know what the driver is doing, you need to put it on the horn of your choice and measure it.

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  4. 13 minutes ago, NOSValves said:

    By the end of the night, we were down to a few of us, at that point we had moved the speakers at least a dozen feet off the back wall and about a dozen feet apart we sat maybe 10 feet back from the speakers.... turned the light off so it was pitch dark, cranked it up the speakers sonically disappeared. Was it really shocking or were we just drunk and tired ;)  I think it was real

    I remember Trey shouting, “You should see how bad the group delay is on those things.”


    ”Good sir, we do not give two &!$@!”

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  5. It’s not the crossover, because if it was, neither of your woofers would be working. So, it’s either damage to the driver, or your little buddy chewed through some wiring. 

    Use a Torx bit #20 to remove the screws to the back plate. Inspect the network and the wiring. With a good flashlight, you can inspect the wiring through the rear. 

    Same Torx bit for the woofer. Avoid power tools and take your time. Once you get the woofer out, put a meter to it. 

    Funny thread, do some people actually not know there is only one “deang”? 

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  6. 1 hour ago, Stephen Buck said:

    On used original commercial units redeployed to home use.

    Commercial plywood LaScalas had commercial woofers with higher SPLs and were often deployed in harsh environments, auditoriums with high temperature and humidity swings over many years. It’s fantastic people find them so good for reuse.  

    Before you go screw up a pair of AL5s which are MDF/HDF and therefore have different resonance characteristics, I’d consider your SPLs and real world use and actual audible measurements from listening position.  Should be easily done with test tone and mic, to pick up actual signal mismatch and with someone alternately pressing on sidewall to dampen to see if errant signal reduces or goes away.  Probably REW can do it. 



    Along with the MDF, quite a bit of correction built into the new networks. 

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  7. 4 hours ago, Stephen Buck said:

     … it’s the arrival time of the same frequency from two locations that can either amplify or cancel.  

    How can it amplify (sum). I thought it was out of phase wave cancellation? That’s why the response looks like a comb. I don’t see how this could ever be a good thing. 

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