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PCD Measurement help

ani_101ani_101
in DIY
I put a cap in series before a super tweeter to roll off the response and took measurements. It's a 4.7 if cap. So when I load into PCD, do I need to enter the cap anywhere. If not then in the final circuit where do I keep this cap?

Comments

  • kennykkennyk
    edited March 2017
    When I use a cap for "protection" while testing, I don't include it. Now, if it changes the effective FR I have to include it in the final measurement. Your cap has approx 4k hz filter, at 8ohms. Does this effect the FR to make a noticeable change?
    ............. could you hum a few bars.
  • MzissersonMzisserson
    ani_101 said:
    I put a cap in series before a super tweeter to roll off the response and took measurements. It's a 4.7 if cap. So when I load into PCD, do I need to enter the cap anywhere. If not then in the final circuit where do I keep this cap?
    No. The cap.is already accounted for in tge measurement itself. It woukd be like adding another 4.7 cap to the response. 

    Whats the target XO? 4.7 may be a little too small.... make sure its roll off occurs at least one octave below the desired xo point. 
  • ani_101ani_101
    Planning to come around 7 or 8k. The mid is fr88ex. How do I know if the fr is changing or not? There doesn't seem to be much difference from the published FR and with the cap. There is a sharp knee and roll off at around 2k.
  • ani_101ani_101
    I am measuring for coming. Due to the low sensitivity of the woofer I have to measure everything at a pretty high level hence the cap. Don't mind the cap being part of the XO, but not sure how to account for it or where to add to the actual XO circuit, even if I don't include it in PCD.
  • MzissersonMzisserson
    No worries man,

       That 4.7 is just fine then! Whatcha puttin together?
  • kennykkennyk
    Yes, give us the details.  :)
    ............. could you hum a few bars.
  • ani_101ani_101
    This is for my InDIYana build... Three way with side firing woofer. Will take some snaps and post. Though not sure how it will turn out...
  • kennykkennyk
    Ani, you are such a show off. Mine only has a port....Shucks.  :p
    Mzisserson
    ............. could you hum a few bars.
  • ani_101ani_101
    There is no port, so no bass....
    Mzisserson
  • MzissersonMzisserson
    Just throw a PR in there with 10KG of mass and you will have bass to -16HZ.....It will arrive 15min late, but who cares? Its moar basses! 
  • kennykkennyk
    Total brain fart, was thinking PR. Mike has a point.
    ............. could you hum a few bars.
  • ani_101ani_101
    Preview... 


    MzissersonTurn2kennykgreywarden
  • kennykkennyk
    That's a cool box...............hmmmmm, it does remind me of another design...........
    ............. could you hum a few bars.
  • MzissersonMzisserson
    Ani, those look amazing! Please keep posted! 
  • ani_101ani_101
    you are right, loosely based on the W5, but sealed to stay within the guidelines and I didn't like the wonky bass response at 2.5 L with a 5 inch port. And the tweeter is in the front.
  • isaeagle4031isaeagle4031
    I like the looks of that!
  • squamishdrocsquamishdroc
    ani_101 said:
    Preview... 


    Cool design Ani! Is that baffle 1" mdf?
  • ani_101ani_101
    It's 3/4 MDF. It looks bigger than life as it is tiny! It's 6x8 and the overall length is 10inch. 
    squamishdroc
  • MzissersonMzisserson
    Lol, it looks HUGE
  • greywardengreywarden
    That would make a great PC speaker, very nice Ani
    deadhorse - leviathan - harbinger - shockwave (wip)
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