MLS Vs Sweep

[Aucosticraft]

I measured my satellite speakers. with MLS and Sweep frequency. The readings above 500Hz are much identical but starts making difference below it. What could be the reason? which of the two is more accurate?

Attached : Pic of the measurement.

[Elias]

Hi,

Let me guess, the blue one is with mls?


- Elias

[Aucosticraft]

Originally Posted by Elias

Hi,

Let me guess, the blue one is with mls?


- Elias

Why guess? its clear on the lower left side of graph.

Well, no one here has answer?

[Svein_B]

The sine-sweep is usually the one to trust.

Ivo Mateljan, the crator of ARTA, has made some study of this subject, published here:
ARTA Support

Look at: "The Comparison of Room Impulse Response Measuring Systems, Proceedings of the First Congress of Alps Adria Acoustics Association, Portoroz, Slovenia, 2003."

SB

[Elias]

I checked the graph in a hurry, but it was clear which one is which.

Basic mls has poor signal to noise ratio at low frequencies because it has white spectrum. Log sweep has bass boost of 10dB/decade so SNR is better at bass. Mls can use pre-emphasis to increase low frequency SNR, but I don't know if your sofware has it or not.


- Elias

Originally Posted by Aucosticraft

Why guess? its clear on the lower left side of graph.

Well, no one here has answer?

[Aucosticraft]

ok.... Thanks Svien and Elias,

So the conclusion is sweep is better with S/N at lower frequencies.

am I right ?