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Multi-Way Conventional loudspeakers with crossovers

pattern control below 400Hz
pattern control below 400Hz
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Old 18th January 2019, 06:39 AM   #31
Juhazi is offline Juhazi  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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Old 18th January 2019, 06:46 AM   #32
hollowboy is offline hollowboy  Australia
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You should move those bushes in pots on the pavement between the speaker and mic when measuring.
I think maybe you are looking at a hose

The mic is on the little table in front of the laptop.

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Tile floor gives "perfect reflection" now.
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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Old 18th January 2019, 07:34 AM   #33
Juhazi is offline Juhazi  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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Old 18th January 2019, 09:46 AM   #34
hollowboy is offline hollowboy  Australia
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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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File Type: jpg on axis vs 30 degrees off axis.jpg (98.2 KB, 131 views)
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Old 18th January 2019, 09:50 AM   #35
hollowboy is offline hollowboy  Australia
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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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File Type: jpg 150 degrees off axis.jpg (126.3 KB, 122 views)
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Old 18th January 2019, 09:54 AM   #36
hollowboy is offline hollowboy  Australia
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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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File Type: jpg 90 degrees off axis (2).jpg (130.3 KB, 124 views)
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Last edited by hollowboy; 18th January 2019 at 09:58 AM. Reason: slightly wonky image
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Old 18th January 2019, 10:14 AM   #37
Juhazi is offline Juhazi  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
Click the image to open in full size.
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Last edited by Juhazi; 18th January 2019 at 10:19 AM.
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Old 18th January 2019, 07:35 PM   #38
Brett is offline Brett
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This is a concern
It is for me as I typically do it alone. The garage is on the same level as the yard where I test, but the living room is two flights up.
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Old 18th January 2019, 08:14 PM   #39
cowanaudio is offline cowanaudio  Australia
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pattern control below 400Hz
Time to buy a six wheeled stair climbing hand truck. That will make your life a lot easier.
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Old 18th January 2019, 08:32 PM   #40
Brett is offline Brett
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Time to buy a six wheeled stair climbing hand truck. That will make your life a lot easier.
True. Probably a good investment for moving other heavy things too, like fridges and washing machines. I'm off to Bunnings later today...
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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