What is SPL high and low impedance VituixCAD

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#42
From the latest user manual:

  1. Open image file (File->Open image or Ctrl+O) or paste from the clipboard (Edit -> Paste image or Ctrl+V).
  2. Set frequency boundaries: Point and drag the lowest labeled frequency value in the graph with magenta cursor. Enter the same value to text box on the right side of magenta button, or adjust value with up/down arrow keys or mouse wheel. Point and drag the highest labeled frequency value with orange cursor. Enter or adjust the same value to text box on the right side of orange button.
  3. Set SPL boundaries: Point and drag the lowest labeled Y-value in SPL axis with blue cursor. Enter or adjust the same value to Low amplitude text box. Point and drag the highest labeled Y-value in SPL axis with green cursor. Enter or adjust the same value to High amplitude text box.
  4. Set impedance boundaries: Point and drag the lowest labeled Y-value in impedance axis with red cursor. Enter or adjust the same value to Low impedance text box. Point and drag the highest labeled Y-value in impedance axis with cyan cursor. Enter or adjust the same value to High impedance text box.
  5. Select impedance axis type: Linear or Logarithm. Linear scale has absolute increments and typically starts from zero Ohms. For example from 0 to 60 Ohms with steps of 10 Ohms. Intervals of logarithmic scale are ratios, and scale starts above zero Ohms. For example 2, 4, 8, 16, 32, 64 Ohms.
  6. Move mouse cursor inside the graph area and check that Hz, dB and Ohm values in the status line are calculated correctly.
    Warning: Paste and File open commands reset previous settings if image size changes.
  7. Erase gridlines within chart area if luminance of line color is <90 % and color difference to response traces is small. No need to erase if gridlines are very light gray (or dotted line) and response traces are thick with saturated color (red, green, blue, magenta, cyan).
    Click X Grids button to start erasing. Point with crosshair cursor the lines where all horizontal and vertical gridlines are found, but the cursor lines crosses response traces as little as possible. Accept with left click. Gridlines (with luminance <90 %) should be gone.
  8. You can use Image rubber for cleaning vicinity of response curves. Crossing off-axis responses could interfere tracing of axial and impedance responses. Warning! Do not cut axial or impedance responses too much because Undo is not available.
  9. Trace amplitude response. Click Trace SPL button and then starting point of frequency response at the lowest visible frequency. Click again few pixels further if tracing was not started. Traced path is marked with thick red overlay line. If tracing is interrupted or distracted in an intersection, you can correct the path by clicking a point few pixels after the problem. You can also restart from earlier position or beginning as many times you like.
  10. You can use Trace rubber for cleaning bad points of traced curve. For example short jumps above or below correct path. Erased parts will be interpolated when the response is exported to a file. Check Options -> Smooth 1/12 oct. to remove small peaks and tiny steps due to pixels of original bitmap. Smoothing of 1/12 oct. is applied to exported responses.
    Default density of export is 48 points/octave. Lower densities are available in Options menu, but not recommended if responses are created for VituixCAD.
  11. Export amplitude response with Export button (left) after tracing is completed and red overlay line looks fine. Enter filename and select extension (txt or frd). Phase response is calculated automatically as minimum phase. Program estimates slopes of frequency response extensions below and above visible range.
  12. Trace impedance response. Click Trace Z button and then starting point of impedance response at the lowest visible frequency.
  13. Enter voice coil resistance of the driver to Re text box. Initial value is 95% of minimum traced Z.
  14. Export impedance response with Export button (right)…

Just interested to know how this should be written to avoid multi-page discussion.
 
#43
Thanks for replying!! I'll try to answer🙂
First, it's a genius program! Imagine a person with absolutely now speaker-construction knowledge what so ever, within 15 min can use the software to construct an active filter and a passive within 30 min, that's amazing!!
The problem is not the manual or it's detailed description, but the fact that I did not know there were one and the fact that there are a lot of parameters to learn!!
Maybe a document (do not know if it's already made) for idiots, that tells the steps for "first time users" a "hold in hand" guide.
But absolute fantastic software that contains a wealth of functions, one have to learn to be able to use it. Maybe more detailed hints would be nice. I.e. "select type of speaker" possibility is W, P, S, PR and some more. Hint is "select between "W, P, S, PR...."
Else can't I imagine anything that can be done better at all!!


EDIT: Did select help -> manual.
And got an German manual. To me, no problem but not sure for everyone.
 
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