Results 1 to 5 of 5

Thread: 846a Impedance Curve

  1. #1
    Junior Member
    Join Date
    Jan 2010
    West Virginia

    846a Impedance Curve

    Does anyone have or no where I can see the impedance curve for the Model 846a? I know the horn are nominally 16 ohm, no idea about the woofers. Changing the taps on my amps isn't tough but it isn't easy either. I would just like to see what the swings are and how low it goes so I can know whether I should hook up 4, 8, or 16. Would like to avoid having to solder and unsolder the wires multiple times if I can. Thanks!


  2. #2
    Senior Member SMKSoundPro's Avatar
    Join Date
    Apr 2005
    Anchorage, Alaska
    The 864A Valencia uses a 416z 16 ohm woofer with a n800f crossover.

    One step above: "Two Tin Cans and a String!"
    Longtime Alaskan Low-Fi Guy - E=MC▓ ▒3db

  3. #3
    Junior Member
    Join Date
    Jan 2010
    West Virginia


    So we have both the woofer and the horn at 16 ohm. But I assume that is nominal. Do we know how far down either dip? Or an impedance curve for the speaker itself would be great if anyone has one. Probably not, but it can't hurt to ask. Thanks!

  4. #4
    Junior Member
    Join Date
    Mar 2020
    Hi....Ported enclosure has two impedance peaks and a dip between. That dip is both the resonant frequency of the woofer (minimum movement) AND the port (maximum output) - it is the tuning/resonant frequency of the ported box. Optimal resonant frequency depends on Thiele-Small parameters and the size of the box and the tube. For maximum efficiency choose more port area.

  5. #5
    Senior Member grumpy's Avatar
    Join Date
    Oct 2003
    So, 1) that question was 10 years ago.
    2) The minimum impedance between peaks (as noted) for the woofer would likely be close to Re.
    Unlikely that there would be issues further up in frequency that would require a change in tube amp tap for this kind of design.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Impedance Curve for 2123J
    By coherent_guy in forum Lansing Product Technical Help
    Replies: 0
    Last Post: 10-30-2008, 11:32 AM
  2. ALTEC 605 Impedance curve for 8 Ohms
    By dlp4341 in forum Lansing Product DIY Forum
    Replies: 1
    Last Post: 02-13-2008, 09:08 AM
  3. 4315A Impedance Curve?
    By johnaec in forum Lansing Product Technical Help
    Replies: 10
    Last Post: 12-01-2004, 10:56 PM
  4. JBL LE15A Weird Impedance Curve - Need advice
    By scorpio in forum Lansing Product Technical Help
    Replies: 3
    Last Post: 08-09-2004, 12:54 PM
  5. 077 impedance curve
    By stimpiew in forum Lansing Product Technical Help
    Replies: 5
    Last Post: 05-28-2003, 11:01 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts