High performance measuring software

[Snickers-is]

Hi!

I am using LspCAD 6.0 PRO and the JustMLS can not keep up with the performance of LspCAD. I have looked at Praxis and Win MLS, but I am going to use it with my laptop. That makes WinMLS a very expensive solution as it requires an additional PCI-adapter.

Does anyone here have experience with measuring software usable for both normal room and anechoic chamber measurements?

Thanks

[bombardon73]

If you can read german you should try hobbybox

[johnnyx]

I have Praxis and I recommend it.
You may need an external sound device, because you need stereo line inputs which are not always implemented on laptops, the M-Audio Transit is good and inexpensive, so they say.
Praxis has many features, I've only scratched the surface so far, but it is easy to use. They keep updating the software too, with new features; you just download and install the latest version.
It will work well with Lsp CAD.

Here's the website, you can do quite a lot in the free "demo" mode. Try it on the JustMLS files.

[Snickers-is]

One of the reasons why I need a new software is because JustMLS does something to the phase response that makes using the files in simulations very unaccurate. (The summed response does not look like the measured system response). Does anyone know anything about this problem?

[Snickers-is]

I have been looking at the following alternatives:

Praxis (www.libinst.com)
LMS (www.linearx.com)
CLIOwin(www.audiomatica.com)
MLSSA (www.mlssa.com)
WinAudioMLS (www.dr-jordan-design.de)
WinMLS (www.winmls.com)

Anyone with experiences?

[russbryant]

Originally posted by Snickers-is
One of the reasons why I need a new software is because JustMLS does something to the phase response that makes using the files in simulations very unaccurate. (The summed response does not look like the measured system response). Does anyone know anything about this problem?

Can you give us some more details? I have not used JustMLS before but I know people who do use it and there aren't any phase problems that I'm aware of. It might just be a simple setup problem.

Russ

[Snickers-is]

There should not be a setup problem as long as I have measured drivers in one cabinet from one location, connected them in parallell and the measured the total response. The result of summing the drivers in LspCAD does not come close to the measured response even with adjusted phase on each driver.

[russbryant]

Originally posted by Snickers-is
There should not be a setup problem as long as I have measured drivers in one cabinet from one location, connected them in parallell and the measured the total response. The result of summing the drivers in LspCAD does not come close to the measured response even with adjusted phase on each driver.

Your measurement setup is good. I have used this method myself with Clio and SoundEasy.

By setup, I meant setting up LspCAD to use your measurements. Not knowing what you have done, can you describe what you mean by "adjusted phase on each driver"? Sorry about asking such a basic question, but I think it will help you get your problem straightened out.

The measurements you took using the setup you describe will have "time of flight" plus the driver acoustic offset information in it as you probably know. These all have to be acounted for in the LspCAD model.

Russ

[morbo]

Have you set the driver acoustic centre offsets accurately? I seem to recall reading about someone having this problem and adjusting the driver offsets until the summed curve looked like the measured curve... I'll try to dig up the link again.

[Snickers-is]

Originally posted by russbryant
Sorry about asking such a basic question, but I think it will help you get your problem straightened out.

Basic questions is often the simple way to solve a problem, so I am glad you're taking interest in my problem.

In JustMLS you set the distance to the speaker i a dialog box. You also have a reference probe connected to the speaker outpot to cancel any unlinearity in the amplifier and the soundcard.

In LspCAD you may set Z-distance to driver, negative and positive delay, scaling of measured data, scaling of impedance, driver orientation, driver position in x and y-axis, temperature coefficent, cooling, level of heatup, electrical polarity. It also has an extra transfer function that is disabeled by default.