Measurements for EQing and analysis - Home Theater Forum and Systems - HomeTheaterShack.com

 
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post #1 of 4 Old 08-25-16, 09:25 PM Thread Starter
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Measurements for EQing and analysis

Hi please someone help

If we measure Left>Right>Combined wouldn't it be best to do analysis e.g. EQ on the average of left & right, this would take out the discrepancies e.g. timing?

Thanks
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post #2 of 4 Old 08-25-16, 10:30 PM
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Wayne Myers
 
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It is a fairly common question, and the answer is no, assuming the same signal is coming out of both speakers, such as the REW measurement sweep. The slightest mis-positioning of the microphone will lead to crazy variations in the frequency response measurement which are not really there.

You can get a fairly accurate averaged frequency response measurement, as you suggest, using two independent pink noise sources running one to the left and the other the right speakers, with the RTA measurement function. But you get no phase. Information. All measurements discussed around here are one speaker at a time, because that is the only way to get accurate information. Measure accurately first, then average.
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post #3 of 4 Old 08-28-16, 03:24 PM Thread Starter
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Re: Measurements for EQing and analysis

Hi thanks

Just to confirm measure left speaker then right (separately) then average then EQ the average measurement?

Thanks again
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post #4 of 4 Old 08-29-16, 03:49 PM
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Re: Measurements for EQing and analysis

Hi,
In high frequencies (> 5000 Hz), measure each speaker separately. The measurement is spoiled if they both work together, because the microphone records extremely localized interferences (no more than 2 cm) between the two tweeters, that are not representative of the average level actually audible around the measurement spot.
In low frequencies (< 200 Hz), measure them both at the same time. The two speakers interfere with each other and don't produce the same amount of bass as if they were working alone.
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