Crossover for modified Paul Carmody's ZX Spectrum

Collapse
This topic is closed.
X
X
 
  • Time
  • Show
Clear All
new posts
  • argentinaCile
    Junior Member
    • Jan 2016
    • 2

    Crossover for modified Paul Carmody's ZX Spectrum

    Hi to all!
    I'm new to the forum and also i'm new to diy speakers

    My project starts from Paul Carmody's ZX Spectrum/Amiga, a floorspeaker 102cm height, 21.7 wide and 29.3 depth with HiVi M6N woofer and Monacor DT-300+waveguide WG-300. I choose this tweeter with his waveguide because i found it at a really good price and it seemed to me good for crossing with M6N at 2kHz.
    Vent is 5cm diameter (length will be probably between 8.9-3.5" as in Paul's project for a F3 of 42Hz).

    This is the cabinet sketch:



    I added a close part at the bottom to have the speakers a little bit higher: here i will put the crossover.

    I need some help for the crossover because i found the specs of the DT-300 tweeter but i can't find the specs of DT-300+ the waveguide WG-300. I found only some data about SPL increment:

    Hz/ dB Increment
    600/ +4,5
    1.000/ +5
    1.500/ +8
    2.000/ +8
    3.000/ +7
    4.000/ +5
    8.000/ +2
    10.000/ +0

    The waveguide will improve response of the tweeter at lower frequencies, probably facilitating the crossover with the woofer but i don't want the tweeter to be too loud...

    This is the graph of the DT-300 without WG-300:



    I made a test with X Over pro starting from the DT-300 graph and adding the db values written above. Crossing at 2000 hz with 3rd order Butterworth



    Anyone could please help me designing the correct crossover?

    Many thanks!
  • argentinaCile
    Junior Member
    • Jan 2016
    • 2

    #2
    Sorry Tuning at 39Hz and F3 of 34 Hz

    Comment

    • ---k---
      Ultra Senior Member
      • Nov 2005
      • 5204

      #3
      Hi Welcome to the site!

      I did a google of your tweeter and a link to Troel's site popped up. It appeared he used it with a waveguide also.

      I don't know if it is the same waveguide. Different waveguides produce different results.
      If it is the same waveguide, you might be able to trace his tweeter plot and then import this into PCD or your faviorite crossover modeling software and get reasonable results. But, the best approach is always take the in-box measurements and use those for your crossover.

      I'm not familiar with Xover Pro. Does it use real frequency response curves? Can you add BSC?

      Have you read Paul's essays?


      - Ryan

      CJD Ochocinco! ND140/BC25SC06 MTM & TM
      CJD Khanspires - A Dayton RS28/RS150/RS225 WMTMW
      CJD Khancenter - A Dayton RS28/RS150/RS180 WTMW Center

      Comment

      Working...
      Searching...Please wait.
      An unexpected error was returned: 'Your submission could not be processed because you have logged in since the previous page was loaded.

      Please push the back button and reload the previous window.'
      An unexpected error was returned: 'Your submission could not be processed because the token has expired.

      Please push the back button and reload the previous window.'
      An internal error has occurred and the module cannot be displayed.
      There are no results that meet this criteria.
      Search Result for "|||"