Hi All!
this is the first day im using REW.
From the youtube tutorial I've seen, people say it doesnt matter if you put you mic at you sub position, or at the MLP. But I'm getting 2 very different SPL reading.
Can someone explain this to me?
Purple line: subwoofer at its 'OEM' position and Umik-1 at the MLP. noise is set to 75db with the rew generator with pink noise before taking the reading.
Red line: Subwoofer on couch, mic at the subwoofer 'OEM' position. Didn't change anything else except the position of the 2.
Those line are averages from 3 reading for each position. I was doing the exercice because I want to DIY a subwoofer, and I wanted to know if the spot I want to position it will be a good spot. Started measure the "OEM' spot and the MLP to see if they were the same....
So, should I move the sub around and keep the mic at the MLP, or should I keep the subwoofer at the MLP and move the mic around or the reading?
Thanks!
this is the first day im using REW.
From the youtube tutorial I've seen, people say it doesnt matter if you put you mic at you sub position, or at the MLP. But I'm getting 2 very different SPL reading.
Can someone explain this to me?
Purple line: subwoofer at its 'OEM' position and Umik-1 at the MLP. noise is set to 75db with the rew generator with pink noise before taking the reading.
Red line: Subwoofer on couch, mic at the subwoofer 'OEM' position. Didn't change anything else except the position of the 2.
Those line are averages from 3 reading for each position. I was doing the exercice because I want to DIY a subwoofer, and I wanted to know if the spot I want to position it will be a good spot. Started measure the "OEM' spot and the MLP to see if they were the same....
So, should I move the sub around and keep the mic at the MLP, or should I keep the subwoofer at the MLP and move the mic around or the reading?
Thanks!
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Joined 2003
You can use the Room sim window to answer the question of room response if you swap location of mic and subwoofer. Swapping locations you will find that the room response modes does not change. It doesn't take much difference in location to affect this result however, which is most likely cause for difference in your measurements.
That said, single location measurements for room response are problematic. Average of multiple measurements across listening area is useful to capture room average response rather than single point in space. One method is "moving mic measurement" method using RTA continuous averaging and periodic noise to generate the room response, simply move the mic in circles around the listening area, keeping constant pace of movement for averaging. Alternative is to take many measurements (more the merrier), with latest 5.20.14 early access version of REW, use all SPL "cross corr align" to align the measurements, then vector average to create the average result.
That said, single location measurements for room response are problematic. Average of multiple measurements across listening area is useful to capture room average response rather than single point in space. One method is "moving mic measurement" method using RTA continuous averaging and periodic noise to generate the room response, simply move the mic in circles around the listening area, keeping constant pace of movement for averaging. Alternative is to take many measurements (more the merrier), with latest 5.20.14 early access version of REW, use all SPL "cross corr align" to align the measurements, then vector average to create the average result.
