Page 3 of 3 FirstFirst 123
Results 31 to 37 of 37

Thread: Increasing HF attenuation on S3100 MKII network

  1. #31
    Senior Member
    Join Date
    Apr 2014
    Location
    Australia
    Posts
    297
    I'm no expert but to my untrained eye, other than reducing the overall SPL I can't really see a difference in those sweeps.

  2. #32
    Senior Member
    Join Date
    Apr 2003
    Location
    Australia
    Posts
    7,934
    Quote Originally Posted by Earl K View Post
    Hi Ian,

    Here are the two different padding scenarios illustrated by XSim ( using real measurements and impedance files ).

    First up is the single resistor located at the HF input terminal.



    Next pic shows attenuated curves using full LPads located before the HF crossover section.



    Either approach to padding ( at that location ) has its merits ( & drawbacks ).
    - Ultimately, the ears need to decide.

    To be clear, I have no dog in this race.

    In fact, I would simply EQ the Low-end and call it a day ( as has already been suggested ).

    Yes l can see the horn in the second attachment is pulled down in more a linear leveller from 1-4 khertz than the first attachment. The former has a soft tilt from 1-4 khertz

    Thanks Earl.

  3. #33
    Senior Member
    Join Date
    Apr 2003
    Location
    Australia
    Posts
    7,934
    Kelossus,

    The fixed pad approach might be work looking at when time permits because itís an overall reduction of the horn output.

    This can be seen by reference to the left side db scale when comparing the purple and the pink curves.
    Last edited by Ian Mackenzie; 02-11-2024 at 06:53 PM. Reason: Added additional explanations

  4. #34
    Senior Member
    Join Date
    Feb 2004
    Location
    Land of Sunshine
    Posts
    423
    Chiming in,I had the S3100 and I do understand why Kelossus wanted to pad the horn. Unfortunately that would muddle up the crossover region and caused the bass to be indistinct. The 1dB is JBLís practice for fine adjustment only, and the speakers have been tuned to be correct at the crossover region. I would instead suggest experimenting with RC circuit to get a more pleasing slope for the horn.

  5. #35
    Senior Member
    Join Date
    Apr 2003
    Location
    Australia
    Posts
    7,934
    Thank you

    We will look at this more closely.

  6. #36
    Senior Member
    Join Date
    Jul 2003
    Location
    Orange County, CA
    Posts
    3,589
    I'm thinking that this may be the better slope. You loose as much at the top end reducing fatigue, while retaining the detail through the upper midrange.


  7. #37
    Senior Member
    Join Date
    Apr 2003
    Location
    Australia
    Posts
    7,934
    Hi Todd,

    I am sure your thoughtful and generous contribution will be much appreciated.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Attenuation knobs
    By bldozier in forum Lansing Product DIY Forum
    Replies: 0
    Last Post: 02-16-2017, 10:39 AM
  2. JBL S3100 MKII vs JBL L300
    By otenmsa in forum Lansing Product General Information
    Replies: 38
    Last Post: 05-07-2014, 09:21 AM
  3. Solen Electronique and S3100 MKII x'over build
    By Bernard Wolf in forum Lansing Product Technical Help
    Replies: 15
    Last Post: 03-23-2014, 08:16 AM
  4. W15GTI MkII & W12GTI MkII
    By Hoerninger in forum Lansing Product Technical Help
    Replies: 13
    Last Post: 08-08-2008, 06:50 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
  •