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#31 |
diyAudio Member
Join Date: Mar 2007
Location: Jyväskylä, Finland
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You should move those bushes in pots on the pavement between the speaker and mic when measuring. Tile floor gives "perfect reflection" now.
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#32 | |
diyAudio Member
Join Date: Jul 2007
Location: 'straya
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Quote:
![]() The mic is on the little table in front of the laptop. That seems right to me. I experimented with stuff to prevent ground bounce, and found that that made the notch in response worse (more complex).
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#33 |
diyAudio Member
Join Date: Mar 2007
Location: Jyväskylä, Finland
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Pots etc. are diffusers, pillows etc. would be dampers. Anyway sounds like you have recognized the floor bounce 😄
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#34 |
diyAudio Member
Join Date: Jul 2007
Location: 'straya
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Black/yellow = sealed box, on axis vs 30 degrees off axis.
Black/blue = perforated box, on axis vs 30 degrees off axis. Not much difference, but the perforated box is slightly 'tidier' off axis. One has to read around the 2 big ground bounce notches... maybe next time I'll do ground plane measurements.
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#35 |
diyAudio Member
Join Date: Jul 2007
Location: 'straya
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0 vs 150 degrees off axis.
The perforated box has a lot more rear rejection @ 100Hz, but for a 400Hz or 500Hz crossover, this is not a great outcome.
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#36 |
diyAudio Member
Join Date: Jul 2007
Location: 'straya
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0 vs 90 degrees off axis. This is where the perforated box shines.
...so it would be throwing a bit less off-axis sound into the room.
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#37 |
diyAudio Member
Join Date: Mar 2007
Location: Jyväskylä, Finland
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Looks like REW? I love it but it can't draw directivity graphics or count DI. But taking measurements at 10¤ steps and overlaying all of the 0-90¤ (and 90-180¤ separately) would reveal the directivity "shape". Set IR gating to 6, 12, 20, 60 etc. ms and look at same measurements again. I have found 20ms and 1/12 smoothing best and then first reflections can be detected easily.
This is from ARTA and from this thread DSP midrange directivity control aka kinda cardioid ![]() Last edited by Juhazi; 18th January 2019 at 10:19 AM. |
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#38 |
diyAudio Member
Join Date: Jan 2002
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#39 |
diyAudio Member
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Time to buy a six wheeled stair climbing hand truck. That will make your life a lot easier.
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#40 | |
diyAudio Member
Join Date: Jan 2002
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Quote:
To finally mount the top sections in-situ, I think beers, BBQ and make a day of it with a few mates. |
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