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Old 4th March 2011, 01:21 PM   #1
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Default MLS Vs Sweep

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.
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File Type: png Sweep vs MLS.png (33.9 KB, 123 views)
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Old 4th March 2011, 08:01 PM   #2
Elias is online now Elias  Finland
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Hi,

Let me guess, the blue one is with mls?


- Elias
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Old 5th March 2011, 06:30 AM   #3
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Quote:
Originally Posted by Elias View Post
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?
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Old 5th March 2011, 06:51 AM   #4
Svein_B is offline Svein_B  Norway
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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
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Old 5th March 2011, 11:02 AM   #5
Elias is online now Elias  Finland
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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.


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Quote:
Originally Posted by Aucosticraft View Post
Why guess? its clear on the lower left side of graph.

Well, no one here has answer?
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Old 6th March 2011, 12:28 PM   #6
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ok.... Thanks Svien and Elias,

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

am I right ?
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