Matrosim – Software that simulates reflex-free measurement

[xmag]

When measuring speakers inside your room with REW, a frequency curve is created that has huge throws in the bass. At the lower frequencies, the measurement result is not correct due to reflections, standing waves and close to solid surfaces. Matrosim is intended to remedy this by simulating the measurement curve made to correspond to a measurement curve in a reflex-free room or measurement outdoors.

https://exmag.se/matrosim-aprogram-that-simulates-reflex-free-measurement/

A frequency curve in a room imported from REW:

Same as above but processed in Matrosim:

Manual, nedladdning och mer här:
https://exmag.se/matrosim-aprogram-that-simulates-reflex-free-measurement/

 

[sledwards]

Okay, I’ll bite. What does this have to do with Audiolense?

 

[xmag]

Have I placed the thread in the wrong forum section?
Yes, I think I did! I must have clicked wrong but meant right.
If so, maybe an admin can move it to the correct section?

 

[Sonnie Parker]

I moved it for you.

Interesting for sure. Curious though, how could you verify the accuracy of such a program. Also, I think we want to know what the room is doing to the frequency.

 

[xmag]

I moved it for you.

Interesting for sure. Curious though, how could you verify the accuracy of such a program. Also, I think we want to know what the room is doing to the frequency.

THANKS!
When I have time, I will explain the function.

 

[juicehifi]

When measuring speakers inside your room with REW, a frequency curve is created that has huge throws in the bass. At the lower frequencies, the measurement result is not correct due to reflections, standing waves and close to solid surfaces. Matrosim is intended to remedy this by simulating the measurement curve made to correspond to a measurement curve in a reflex-free room or measurement outdoors.

https://exmag.se/matrosim-aprogram-that-simulates-reflex-free-measurement/

View attachment 91759




A frequency curve in a room imported from REW:
View attachment 91760




Same as above but processed in Matrosim:

View attachment 91761

Manual, nedladdning och mer här:
https://exmag.se/matrosim-aprogram-that-simulates-reflex-free-measurement/

This is for sure not an anechoic representation. If it were, the bass would have dropped off earlier … and more.

Furthermore, the energy storage and energy level seems to be the same as in room. All the sound that’s kicking and bouncing from surface to surface is still present, just in a smoothed version.

Outdoor there would be lower levels overall …. and of course much less bass.

You have managed to reduce the info about how the speaker interacts with the room. But you are nowhere close to giving an anechoic representation of the speaker output.

 

[xmag]

It's a beta version. I'll adjust it over time. The calculation is done against a wall, not completely free. I probably missed writing that.

Of course, it cannot be exact with actual measurement in a non-reflective room or outdoors (with a wall behind). But the measurements I and a few others have done show that it comes close, often accurate. If nothing else, it is easier to read the frequency curve done indoors after running it through this program.

The program calculates a theoretical frequency curve for the speaker used when it is placed against a wall (as it often does at home) with the data you enter. Above the -3dB case up to 1 kHz, a different algorithm is used. I have also included a smoothed version of the different waves of the frequency curve and merged it with the calculated curve.

 

[Sonnie Parker]

This is for sure not an anechoic representation. If it were, the bass would have dropped off earlier … and more.

Furthermore, the energy storage and energy level seems to be the same as in room. All the sound that’s kicking and bouncing from surface to surface is still present, just in a smoothed version.

Outdoor there would be lower levels overall …. and of course much less bass.

You have managed to reduce the info about how the speaker interacts with the room. But you are nowhere close to giving an anechoic representation of the speaker output.

Yeah... if it could give us a true anechoic response, it would be a viable tool for reviewers. I don't see where it would help with tuning our systems in our rooms.