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Multi-Way Conventional loudspeakers with crossovers

Trying to interpret measurements for baffle step loss
Trying to interpret measurements for baffle step loss
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Old 15th May 2019, 01:08 AM   #21
AllenB is offline AllenB  Australia
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Originally Posted by Juhazi View Post
then carry the speaker next to a building/wall
Yes. Know what effect the wall has on its own so you can treat it if necessary. Also, please decide whether you will fill the middle shelves with DVDs and measure the difference.
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Old 15th May 2019, 01:22 AM   #22
AllenB is offline AllenB  Australia
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Since my design don't have any baffle step correction
When the change in response has a different character to the change in power, then the 'correction' should be an acoustic one, not electrical.
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Old 15th May 2019, 12:15 PM   #23
Juhazi is offline Juhazi  Finland
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I was thinking about this today. I don't think it is necessary to know exactly what a speaker's freefield/groundplane response is. Room measurement with long gating represents the final outcome. One most just have understanding of the basic effets of boundaries and modes.

Indoor ground plane measurement eliminates floor bounce and moving the mic and measuring the response at several points in space (also vertically) reveals modes. Average of several measurements and 1/2 octave smoothing is a rather good basis to see what eq/compensation is needed. Listening impression is important too, most people prefer a room response where bass level is 3-5dB hot. A measurement with both speakers playing is not beneficial, it has even more problems!

My speaker measured at several spots and average with -20dB. I tried to eq the hump 40-50Hz, but it sounded bad - it is a mode.
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Last edited by Juhazi; 15th May 2019 at 12:18 PM.
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Old 15th May 2019, 04:03 PM   #24
Defo is offline Defo  Norway
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Just wanted to add an interesting observation. I stuffed the shelf portion between the two enclosures with pillows, and the ~180 Hz hole went away. Smooth bass performance all the way.

Any theories why this might be?
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Old 15th May 2019, 04:46 PM   #25
bentoronto is offline bentoronto  Canada
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Trying to interpret measurements for baffle step loss
Quote:
Originally Posted by Defo View Post
Just wanted to add an interesting observation. I stuffed the shelf portion between the two enclosures with pillows, and the ~180 Hz hole went away. Smooth bass performance all the way.

Any theories why this might be?
180 Hz is prolly outside the band where the room as a whole has influence.

Hard to say if your "pillows" absorb or reflect or both?

B.
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Last edited by bentoronto; 15th May 2019 at 05:07 PM.
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Old 15th May 2019, 04:49 PM   #26
bentoronto is offline bentoronto  Canada
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Trying to interpret measurements for baffle step loss
Quote:
Originally Posted by Juhazi View Post
I was thinking about this today. I don't think it is necessary to know exactly what a speaker's freefield/groundplane response is. Room measurement with long gating represents the final outcome. ... Listening impression is important too, most people prefer a room response where bass level is 3-5dB hot. .
You are becoming more human-perceptual. Nice enhancement to your physics talent.

Maybe gating timing measurement should also relate to type of music or video?

BTW, I think REW has adaptive gating, varying with freq.

B.
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Old 15th May 2019, 04:52 PM   #27
Juhazi is offline Juhazi  Finland
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Click the image to open in full size.

Filling the cavity obviously eliminated at least 30% of waves going around the bend of the baffle and making SBIR reflection/nulling.

AllenB?
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Old 15th May 2019, 06:09 PM   #28
Defo is offline Defo  Norway
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Originally Posted by bentoronto View Post
180 Hz is prolly outside the band where the room as a whole has influence.

Hard to say if your "pillows" absorb or reflect or both?

B.
Quote:
Originally Posted by Juhazi View Post
Filling the cavity obviously eliminated at least 30% of waves going around the bend of the baffle and making SBIR reflection/nulling.

AllenB?
Tested filling the cavity with MDF. Here's the result
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