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Old 31st July 2014, 10:59 PM   #11
PeteMcK is offline PeteMcK
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re:"Does it do series XOs?" yes
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
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Old 31st July 2014, 11:16 PM   #12
planet10 is offline planet10  Canada
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Quote:
Originally Posted by wintermute View Post
I think the answer is yes!
Than i guess it will be worthwhile loading a 2nd program on my MacPro with XP (boy do i hate XP thou)

dave
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Old 31st July 2014, 11:39 PM   #13
5th element is offline 5th element  United Kingdom
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I gave it a quick whiz, it does what it needs to to get nice results. It appears to add in smoothing though with no way to turn it off.

The only things missing from what it can currently do would be the ability to add in target curves, such as a 4th order LW low pass at 2000Hz, for example, on your mid bass. I know that it can do this if you want it to by importing a curve, but this is a hassle. It'd be nice if you could add in a little section to each driver where you have it's target curve associated with it. IE you right click on the driver and an additional option 'target curve' appears there, you select it and then you can define exactly what you want it to be, including setting the level of the target and adding in multiple curves. Like if you had a mid range driver and needed to set the target to have a high and low pass together.

You've already mentioned adding in the ability to set the mic distance and presumably entering in the software the relative positions of the drive units to the mic. Currently you've got offset in the Z plane, but no X and Y.

If you add in target curves, an optimiser would be the icing on the cake, where you tell it to iteratively adjust the values of certain components (ones you pick) in an attempt to make the filtered response match the target curve, but that might be a little bit too much for a freebe.

Still if you put that in it'd probably be the best free loudspeaker designing software out there. All you'd need to then add would be active xovers and possibly DSP coefficients and you'd have something awesome. For the DSP part though all you'd need to do is have function blocks, such as adding in a 2nd order IIR type filter, where you adjust the Q and centre frequency and pick say a 'low pass'. Even if it didn't calculate any coefficients, simply being able to see what the Q and centre frequency are would be plenty to enable you to enter the specifics into something like the DCX2496. Then you'd just need to add in a selection of filter types, notch filter, peaking filter, high shelf, low shelf, linkwitz transform, high pass, all pass, etc. Quite similar in fact to what you could do for active xovers.

This might all sound like too much work, but I'm just talking out loud about what you could add.
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Old 1st August 2014, 02:01 AM   #14
bwaslo is offline bwaslo  United States
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everyone, thanks for the kind comments.

5th element -
Default smoothing is 1/24th octave. But you can turn it off (or vary it) via bringing up the curve in the Curves menu of each graph, same place where you can change the color or choose whether to show phase.

The target curve thing might be a nice feature, though not something I'd personally ever find useful. The "named" filter shapes (Butterworth, LR, Bessel, etc) seem to be theory teaching things, not terribly relevant (to me at least) with real delay offsets in play, already existing acoustic rolloffs, and driver EQing to handle. When I do crossovers, I work in terms of number of poles and zeroes added and how the curves behave where they join each other. Just by adding or adjusting R,L,Cs to get responses and impedances that work out, not thinking about what names the curves might be. But that's just my personal approach, I know others work differently. (FWIW, I didn't even use to use simulators at all for basic crossovers. I'd just start with a pile of parts and some alligator clipleads and watch response while I added and changed parts. Not the best approach, though, since designs tended to get fixed on whatever inductor and capacitor values I happened to have).

Of course for an optimizer, target curves would be needed (not just FR, also minimum impedances and stopband attenuations).

Planet10 -
Yes, you can do series crossovers. But I don't have any circuit blocks in the XSim install to pre-calculate them, you'll have to build the structure and adjust the values. Maybe someone will want to take a crack at designing a circuit block for that? The editor/designer for CircuitBlocks is in XSim (see "File>ChangeMode"). A look at the designs of some of the blocks provided (load them in after you get into the circuit block editor) should show roughly how to make them up.
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Old 1st August 2014, 03:54 AM   #15
bolserst is offline bolserst  United States
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I gave it a quick whirl. Seems very intuitive to operate.
Two quick comments:

1) Did you intend for the phase of the electrical response to change when you added a delay to a driver?
I figured that would have been acoustic delay only, whereas changing delay in the amplifier would change both electrical and acoustic phase.

2) An auto range button in the frequency response Scale dialog box would be handy to locate curves you have loaded that may have large disparity in SPL level.
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Old 3rd August 2014, 01:34 PM   #16
cviller is offline cviller  Canada
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For some reason, I cannot select any actual drivers or get to edit mode in the parameters - what am I missing?

Thank you in advance!
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Old 3rd August 2014, 03:35 PM   #17
ente is offline ente  Germany
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Default XSim meets LoudspeakerSoft ?

Hi Bill,

thanks for Xsim. If you are looking for additional features it would be fine if you could check LoudspeakerSoft:

http://www.igdh.eu/?download=966
http://www.igdh.eu/wp-content/upload...0a-Rev-1.0.pdf

It is a nice piece of software from Mabat (Marcel Batic), a little buggy but with nice features.

Regards
Heinrich
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Old 3rd August 2014, 06:04 PM   #18
bwaslo is offline bwaslo  United States
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Quote:
Originally Posted by cviller View Post
For some reason, I cannot select any actual drivers or get to edit mode in the parameters - what am I missing?

Thank you in advance!
Put your mouse over a component, then right-click your mouse. A menu pops up. Pick the one labeled "tune".

As in most Windows applications, Right-Click means "what can I do with this?" or "Let-go", Left-Click means "Do this" or "Select this".
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Old 3rd August 2014, 06:38 PM   #19
cviller is offline cviller  Canada
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Yes, I know.

My issue is when I click the "Find a Part#", then I get an empty list and none of the fields are editable. I was thinking that I could either load or type in the T/S parameters from the datasheet. But I cannot edit or select anything.
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Old 3rd August 2014, 07:26 PM   #20
bwaslo is offline bwaslo  United States
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See "Stuff to Come" in the first post of this thread.

Part numbers won't be there until vendors provide the data from their websites so XSim can access it. Note that there isn't anything for Thiele/Small parameters to be used for yet, it's a crossover program (not a box design program) for now.
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