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Posts posted by JohnA

  1. On 3/10/2022 at 1:09 PM, Trikxx said:

    Someone explain this to me so I don’t think I have faulty speaker. 

    the tweeter (the one at the top) produces no sound…just a very subtle hiss. All the vocals seem to come from the midrange horn. Woofer works fine. 
    is this normal? 




    Probably.  You will hear cymbal strikes and shimmer plus tamborines in the tweeter.  Very little voices. 

    • Like 1
  2. On 3/7/2022 at 5:19 PM, Edgar said:



    It was the first piece of high-end gear that I bought, way back in 1979. I was still in college, and FM was still good.


    Wasn't it, though!  I had a midrange Kenwood tuner and integrated.  Climbed on the roof of the dorm and installed an antenna and ran the wire in the window.  We could listen to WKDF in Nashville from Cookeville.  I awoke in the middle of the night to hear 'KDF announce the Skynyrd plane crash!  As WKDA-FM, they broadcast in quad, especially after midnight. 


    Fond memories.  No idea what happened to the Kenwood gear. 

    • Like 2
  3. Stuffing (foam, fiber fill) adds "give" to the woofer's back air chamber, making the woofer think the chamber is larger than it is.  if the chamber is sized for the woofer, adding stuffing will cause a ripple in the response curve at its lower limit (though you may get a few  more Hz deeper response).  I wouldn't unless you have calculated a need for the stuffing.  My older La Scalas do not have stuffing, nor did my FH-1s with original Peavey woofers. 

    • Thanks 2
  4. I've heard the RSW-15 and was impressed, but I'd want 2+.  Made the lobby scene in The Matrix feel real.


    Having started with 1, then 2, then 4 VMPS New Larger Subwoofers, More fill the room and reduce distortion.  I feed my 4 with Acurus A250 at about 350 watts each.  The "Revenge Of The Fallen" movie cost me 2 subs and another A250! 


  5. On 2/23/2022 at 11:32 PM, svberger said:


    What some folks have indicated about their subs in that much of the time they didn't even know if it was off or on is much the same experience I've and most others have had with this unit with Allison and AR speakers. .....


    Properly dialed in, subwoofers should not be obvious.  It they are, they are likely 10 dB too loud. 

  6. On 2/22/2022 at 12:36 PM, svberger said:

    I knew I'd confuse people with this thread, and that was not my meaning. I have this device, and was considering experimenting with it. That's all. I just didn't want to hurt the speakers in using it and that's why I asked the original question. ......


    Give it a try.  A La Scala is, in fact, a high-quality sealed box system.  But the excursion needed to produce 20 Hz will cause a lot of distortion if you push it.  14 dB is 25x more power than the unequalized range. 


    A better choice would be a programmable parametric eq.  Set it to about +3 at 60 Hz, +6 at 50 Hz, +10 at 40 Hz and cut off hard below 40 Hz.  There is not much music below E1, 41.2 Hz.  Though a piano goes down to 27.5.

    • Like 1
  7. A few old Macs has a derived center channel out at preamp level.  Does either of yours?  If not, Mr. Paul sketched up a line level box to derive the center channel and that could feed your 5100 to control the center.  I would link to the Dope From Hope had I found it. 


    I will also recommend you rework the Heresy's crossover to be as much like your La Scala crossovers as possible and drop the taps of the squawker and tweeter on the autoformer one step to flatten the Heresy's response curve.  I have done both on my HT center channel Heresy. 

    • Like 1
  8. They appear to be what we have termed Heresy 1.5s.  That is, Heresy 1 woofer and tweeter and Heresy II squawker.  The caps are original Klipsch.  wait until you get your quality electronics back before final judgement, and check each driver to be sure all are working with matching output before replacing the caps.  However, they are likely to be the problem.  Use high quality film and foil caps for replacement.  They will be expensive, but you don't have to spend $200 each.  Audiocap PPT The gas at Parts Express ought to do.  Go with better if you can.  Avoid metalized caps as they sound a little brittle and edgy and Heresies don't need that. 


    Look on the back edge plies for letters and numbers.  They will be the serial number and/or the builders stamps. 


    A quick repair for the hole in the woofer is a small piece of cigarette paper on each side of the cone glued with Somers.  Smooth the edges of the hole first.  you can get a replacement or that one reconed later.  I'd just leave the dust cover alone, but there are some tricks with duct tape and vacuums to pull it out. 

    • Like 3
  9. On 1/14/2022 at 12:16 PM, DaveF said:

    Regarding Heresy IV:

    1. When I remove the binding post bridge and connect a stereo amp to the lower two posts, I get sound from the woofer. connecting the amp to the upper posts gives sound from the mid range and tweeter. Does this imply that the internal/passive crossover is being bypassed for the lower pair?
    2. I am testing an active crossover (Ashly RX-1001) for horizontal biamping. The active crossover frequency is set at ~850 Hz. The high/mid output for each channel feeds a class A amp, which is connected to the upper pair of binding posts. The low outputs feed a class D amp, which is connected to the lower pair. I'm managing the gain difference with the Ashly's controls. In this case, is the signal from the class D amp going directly to the woofer and the signal from the class A amp going to the internal/passive crossover and then to the mid range and tweeter?


    I've seen suggestions that proper bi or tri amping requires bypassing the internal crossover, but I really don't want to mess around inside the speaker cabinet. This project is driven by curiosity, not necessarily the pursuit of better sound. It's a hobby... I do stop messing around and listen to music most of the time. But right now I'm trying to understand what's going on.


    Heresy IVs are configured for bi-WIRING, not bi-amping.  That means 2 pair of wires from one amp channel to each speaker.  A dubious benefit if your wires are large enough. 


    Bi-amping, actually for a Heresy, tri-amping, should bypass any passive x-over should be bypassed (short of a capacitor protecting  the horn drivers) and then the electronic crossover can contour the driver's response, minimize the overlap between drivers and time align the drivers. This has a verifiable benefit.

    • Like 1
  10. On 12/22/2021 at 11:06 PM, Invidiosulus said:

    You don’t say.


    A number of years ago I switched from an HK-430 on my H1’s to an NAD preamp into a little Alesis RA-100 power amp.


    There was, I seem to remember, a noticeable difference.


    The damping factor on the Alesis is listed at 200.



    I bought an Alesis RA-150 for the church a few years back.  I sounded "rather decent". 

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