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Which impuls response is better
- Thread starter Darek K
- Start date
Keith_W
Major Contributor
Yellow is better, because the ringing is shorter. But the ringing might be shorter because its volume is lower. It's very hard to tell because of the zoomed out time scale which causes the initial impulses to be all squished together, but it does look as if the volume of the yellow sub is lower. The impulse response also needs to be interpreted together with the frequency response.
So yes, post the MDAT.
So yes, post the MDAT.
boxerfan88
Major Contributor
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- Oct 23, 2018
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yellow looks better.
- Thread Starter
- #5
Keith_W - thank You.
This short sentence told me how much I needed to know.
Indeed, corner placement was +3dB lauder.
ppataki and boxerfan88 - thank You for Your attention too.
KSTR
Major Contributor
Impulse response only shows the very high HF content, better use step response (the time integral of impulse response) in which mid/low frequencies are represented better.
- Thread Starter
- #7
Here is my mdat file.
First O/C means bassreflex open/closed
Second C/M means - in the corner / little in the middle
e.g. SubO C means open bassreflex inthe corner
Measurments with 75dB are after applying PEQ filters in minidsp.
First O/C means bassreflex open/closed
Second C/M means - in the corner / little in the middle
e.g. SubO C means open bassreflex inthe corner
Measurments with 75dB are after applying PEQ filters in minidsp.
Keith_W
Major Contributor
Not clear which curves you want us to compare, or what. So i'll just look at the step response (it's better for looking at low freqs).
First step is to align the SPL's. I chose an alignment centre of 63Hz. Left = before alignment, right = after. If you don't align the SPL's, it will make the quieter measurement look as if it has less ringing in all time domain graphs compared to the louder measurement.
This is the step response after SPL alignment. Blue is post-DSP, purple is before DSP. We can see a few features:
- post DSP has less ringing after the initial impulse.
- all the peaks in the blue graph decay in amplitude after the initial peak. You do not want any secondary peaks to be higher than the initial impulse.
FYI, this is the step response of one of my subwoofers with the graph adjusted to the same time scale of 400ms. There is less ringing. Servo control, baby!
First step is to align the SPL's. I chose an alignment centre of 63Hz. Left = before alignment, right = after. If you don't align the SPL's, it will make the quieter measurement look as if it has less ringing in all time domain graphs compared to the louder measurement.
This is the step response after SPL alignment. Blue is post-DSP, purple is before DSP. We can see a few features:
- post DSP has less ringing after the initial impulse.
- all the peaks in the blue graph decay in amplitude after the initial peak. You do not want any secondary peaks to be higher than the initial impulse.
FYI, this is the step response of one of my subwoofers with the graph adjusted to the same time scale of 400ms. There is less ringing. Servo control, baby!
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