Announcement

Collapse
No announcement yet.

Are my phase-curves OK?

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • lasse
    replied
    Originally posted by Dave Bullet View Post
    Are you using extracted min phase for all drivers? Also - did you remember to enter a -ve Z offset on any drivers relative to the tweeter voice coil? I see from the picture your T/M box is sitting back from the woofer. so probably ok on mid / woofer voice coil offset. But check all drivers anyway from the intended listening distance in your simulation. I simulate at 2 metres for a 3 way.
    Hi,

    Tes, I have extracted min phase for all three drivers with info from a common microphone position/point 130 cm at tweeter height.
    I have no means of entering a listening position so I guess that the mic position is the "listener position"

    The offset is the measured/guessed delta AC for the drivers and I have chosen 1 inch for the tweeter to be in front of mid and woofer.

    Regards//lasse
    Last edited by lasse; 11-06-2018, 02:09 PM. Reason: Completing the answer

    Leave a comment:


  • Dave Bullet
    replied
    To get the woofer tracking better with the midrange (I'd prioritise this over mid/tweeter tracking), you want to try and smooth that hump between 500 - 1000 Hz. Try adding a resistor in series with your 44uF capacitor (this will reduce the slope) but increase the capacitor value to increase the "cut". Shunt resistors are helpful at shaping slopes and they also help increase impedance (although yours looks fine).

    Leave a comment:


  • Dave Bullet
    replied
    Are you using extracted min phase for all drivers? Also - did you remember to enter a -ve Z offset on any drivers relative to the tweeter voice coil? I see from the picture your T/M box is sitting back from the woofer. so probably ok on mid / woofer voice coil offset. But check all drivers anyway from the intended listening distance in your simulation. I simulate at 2 metres for a 3 way.

    Leave a comment:


  • lasse
    replied
    Hi all,

    This is a new version of RFL-3way, this time including the woofer. (and a picture of the system under test/development)

    The responses rely on the assumption that the tweeter is one inch in front of the mid and the woofer (that can be adjusted easily as can be seen by moving the mid/tw unit)

    Best regards//lasse



    Click image for larger version

Name:	Totaldesign ver 2018-11-05.JPG
Views:	99
Size:	238.5 KB
ID:	1392912Click image for larger version

Name:	IMG_0081.jpg
Views:	95
Size:	22.9 KB
ID:	1392913

    Leave a comment:


  • lasse
    replied
    Originally posted by dlr View Post
    Why does your midrange SPL stop at 10K?

    dlr
    Actually, I don´t know.

    Will check.

    Later//lasse

    Leave a comment:


  • dlr
    replied
    Why does your midrange SPL stop at 10K?

    dlr

    Leave a comment:


  • billfitzmaurice
    replied
    The only time phase matters is when the combined shift in the vicinity of the crossover approaches 180 degrees. So long as that's not the case you're good.

    Leave a comment:


  • lasse
    started a topic Are my phase-curves OK?

    Are my phase-curves OK?

    Hi,

    In the linked thread:
    http://techtalk.parts-express.com/fo...eally-that-bad

    We have learned a lot about phase and related matters in the design of speakers.

    All the things appear to me as being quite useless if one makes a mistake when extracting phase from the measured SPL data for the speakers.

    As a “sanity check”, can you look at the attached picture and say if you think that the phase-curves seem OK?

    Best regards//lasse


    Click image for larger version

Name:	Bild SPL och fas Mid och Tw.JPG
Views:	95
Size:	78.8 KB
ID:	1392655
Working...
X