Jump to content

Welborne

Regulars
 View Profile  See their activity

  • Posts

    109

  • Joined

  • Last visited

 Content Type 

Everything posted by Welborne

  1. Welborne
    Can the Radian 950 be used in a 400hz 6db slope in LS?
  2. Welborne
    Can't disagree! This may have been mentioned somewhere already. How many 4' x 8' sheets of woodply is needed to build a pair of QP? Is there a cutting plan somewhere?
  3. Welborne
    Can't disagree! This may have been mentioned somewhere already. How many 4' x 8' sheets of woodply is needed to build a pair of QP? Is there a cutting plan somewhere?
  4. Welborne
    Some close up
  5. Welborne
    Claude, Thanks! Before a quarter pie will be available to me, I will first try them in my La Scala. Btw, before coming across your QP, Martin of Azura Horn Australia also gave me lots of info and advice on his bass horn which I was considering seriously to retire the LS. http://www.azurahorn.com/azurahorn_horns.html Look for the L-Shape bass horn in the above link. He has the cutting plan provided on his page.
  6. Welborne
    Oh, my 15c from Parts Express arrived in Hong Kong just 6 days after my ordering. Quick!
  7. Welborne
    So what should be the correct dimension of the reflector?
  8. Welborne
    On a separate subject. Not sure if this has been discussed so I ask here anyway. Anyone added a 45 degree reflector inside the right angle corner of the La Scala bass, two per channel? These could be made from pieces of solid wood, and then attach to the corner by blutack. But the point is: is this producing any audible benefit?
  9. Welborne
    Deag, what is the benefit sonically of a battery bias network? Is there a battery biased Type A?
  10. Welborne
    The advantage is lower distortion. The larger diaphragm doesn't need to move as much. Also, the horn throat distorts less - think of it like the air doesn't need to rush back and forth as fast. For the same volumetric displacement, the air velocity is less. Disadvantages typically include less performance at high frequencies due to heavier diaphragm (mass corner) and bell modes (the diaphragm bending resonances start at lower frequencies). Depending on the driver/horn design, you typically see beaming at ~6.8kHz with 2" throat versus 13kHz for a 1" throat. For a mid-range application, the 2" drivers tend to dominate....especially in PA applications. The tradeoffs typically end up outside the frequency range of the application. Thanks for explaining. So it's the similar argument that applies to cone speaker drivers.
  11. Welborne
    John: When you said above:"....The BMS measures well but they all do a good job. The advantage of the BMS and the B&C is that they have 2" diameter throats." What is the advantage of having a 2" throat (versus supposedly one of 1")?
  12. Welborne
    Even if the 148hz is inherent in the LS bass dimension and structure, will the flatter response post-148hz make the peak less audible?
  13. Welborne
    Very cool. If others want to try your crossover, where did you source the parts and how much? Anything special to pay extra attention to? I linked your thread on your project below. https://community.klipsch.com/index.php?/topic/160201-bc-dcm50-16ohm-or-8ohm-for-type-a-crossover/ I sourced the green russian K75-10 from ebay. They are a hybrid paper in oil capacitors surplus from cold-war military. Very affordable. But they are HUGE! And they dont have the lead wires on two ends. The outer shells are magnetic metal if this means bad to you. Alternatively you may use the squarish KBG-mb pio caps. Equally cheap and huge. These are true paper in oil. If you do not like the idea of usng Vintage parts from Russia military, then the Obbligsto oil caps are nice enough. Theysound very organic. But one day I may try something like Jupiter paper in wax or Duelund RS series. No, not the Duelund CAST pio, unnless I become insane enough. The russian oilers are good enough to give me goosebumps. But I do have one question: my Le Cleac'h mid horn has a cut off frequency at around 340hz, is this low enough to use the Type A crossover in La Scala?
  14. Welborne
    The k55v / Atlas Pd-5vh measured very respectably
  15. Welborne
    Originally I built the network using Obbligato Oil film cap. I thought they are very nice too! Both are a HUGE step ahead from the AL-3 network which sounds so dry and harsh. All hook up wires are solid core pure silver in teflon tubes. High purity silver (avoid silver plated copper) does not sound bright or harsh, on the contrary, there is a great sense of wetness and calmness in sound.
  16. Welborne
    These are the Type A I did, my first time building a crossover. Also a close up on the horn.
  17. Welborne
    May be I can post a picture of mine here. La scala bass bin 90 degree rotated to damp the side panel vibration by its own weight without using braces. Mid horn replaced by Azura 300hz Le Cleac'h flare and placed right on ear level, with K55v double phase plug version, tweeter replaced by B&C DE120 on $8 PRV tractrix horn from Parts Express. Gave up the orignal AL-3 network and I diy a Type A crossove using russian paper in oil k75-10 capacitors.
  18. Welborne
    Not really since horn loading makes their excursion less than 0.060" at normal volumes. I call horns, "air squeezers" and direct radiators "air pushers" like trying to clap for a performance with one hand instead of two. Which has the better transient response to move the air?Direct radiators need break in because they DEMAND high excursion and the associated IM distortion for their output. It takes about 6-8X the number of direct radiators to do what a horn can do with just 1, and even then, the horn has less distortion. I think smilarly.
  19. Welborne
    Not really since horn loading makes their excursion less than 0.060" at normal volumes. I call horns, "air squeezers" and direct radiators "air pushers" like trying to clap for a performance with one hand instead of two. Which has the better transient response to move the air?Direct radiators need break in because they DEMAND high excursion and the associated IM distortion for their output. It takes about 6-8X the number of direct radiators to do what a horn can do with just 1, and even then, the horn has less distortion.
  20. Welborne
    Any experience?
  21. Welborne
    Do the Kappa 15c need burn in much to perform as expected?
  22. Welborne
    May be I should stick with my k55v ( double phase plug version ) for now. @@
  23. Welborne
    Oh dear, when I am about to order a pair of DCM50 based on everything else I read good abput this driver, now I see this @@
  24. Welborne
    If its a peak, has anyone designed a passive notch filter circuit to flatten it in the crossover?
  25. Welborne
    I am glad I read this. A La Scal user here. I rotated the LS by 90 degree so it sits on one of its otherwise resonating panel, then put crossover, mid horn (a Le Cleac'h flare) and tweeter on top that damps the other side panel by their weight. This kills much of the annoying infamous resonance but still some are left there and I suspect its the doghouse. Will putting in 15c cure this?
×
×
  • Create New...