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Post by craigmorris74 on Jan 27, 2020 13:06:12 GMT -6
I've recently added some extra bass trapping in my room, so I've been taking lots of measurements. I've noticed my NS-10Ms have an odd response when measured together, with big dips at 8.5k and 14k. Is this typical, or are my tweeters out of phase/something wrong. I'm attaching a pic of my measurements. The purpleish lines are each speaker by themselves, the green line is them playing together.
Any help is appreciated,
Craig
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Post by mrholmes on Jan 28, 2020 16:01:18 GMT -6
Did you calibrate the converter in REW? If not read the manual, because 105 db SPL sounds crazy loud to me.
Do you measure with one speaker, if you measure with two is NG - one by one.
For measuring, I would not use NS 10s
Here you can see the NS 10 M measurement with smoothing.
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Post by svart on Jan 28, 2020 16:08:29 GMT -6
Looks like diffraction issues or something.
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Post by indiehouse on Jan 28, 2020 17:22:25 GMT -6
Side question: when measuring room/speakers, what is the baseline? Like you say, down 10db at 100hz, down from what? Is it the SPL that you measured at?
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Post by christopher on Jan 28, 2020 18:39:37 GMT -6
The measurements look strange to me. If it is that loud, you might be measuring your system near max output, and it could be going non-linear. I don’t know that I would trust NS10 (or most speakers) peak output, it’s the average level that seems more linear to me, so I would try a very slow sweep, at a moderately low loudness. Allow enough time at each frequency to get an average level. If you do this and your graph is accurate you will hear all the lumpy up/downs in level and it will audibly correspond to the graph.
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Post by mrholmes on Jan 28, 2020 18:55:56 GMT -6
He needs to calibrate REW that the measurement is ø 80 db SPL.
The manual tells exactly what to do. One Speaker only for taking the measurement. You want to know what is happening in the low end - NS10s are not going to work. It's not so much about the frequency SPL - the goal is a constant RT over the range. My last room was at ø 200 ms the new one is ø 300 ms
Waterfall diagrams tell us what is going on in the room time wise. |
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Post by craigmorris74 on Jan 28, 2020 20:02:57 GMT -6
I've adjusted my amp since I calibrated last, so it's not really that loud. It was a bit hot (87dB), but not what the numbers indicate.
I wasnt concerned about the low end, I was concerned about why the top end looked so crazy when both speakers were playing. Turns out that I didn't have the mic centered between the two speakers. Response is pretty flat now.
Thanks for the input, sorry for the confusion.
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Post by mrholmes on Jan 30, 2020 18:33:13 GMT -6
I've adjusted my amp since I calibrated last, so it's not really that loud. It was a bit hot (87dB), but not what the numbers indicate. I wasnt concerned about the low end, I was concerned about why the top end looked so crazy when both speakers were playing. Turns out that I didn't have the mic centered between the two speakers. Response is pretty flat now. Thanks for the input, sorry for the confusion.
One more time - never measure with two speakers...
One speaker each!
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