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slim and tall 12" ported subwoofer - port location query
slim and tall 12" ported subwoofer - port location query
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Old 22nd July 2019, 12:07 PM   #1
audfrknaveen is offline audfrknaveen  India
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Default slim and tall 12" ported subwoofer - port location query

Hi All,

Due to some space constraints, I have to build a subwoofer nearly 30" tall.
Please see the attached image and suggest which location is better for the port.

Near to the driver? or Away from the driver? Does it have any effect on performance ???

Thanks in advance...
Attached Images
File Type: jpg Port location.JPG (52.7 KB, 133 views)

Last edited by audfrknaveen; 22nd July 2019 at 12:08 PM. Reason: forgot attachment
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Old 22nd July 2019, 02:29 PM   #2
RichK is offline RichK  Canada
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Suggestion: port and driver located close to boundary- floor.
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Old 22nd July 2019, 04:05 PM   #3
wonderfulaudio is offline wonderfulaudio
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At the sub frequencies, makes no difference
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Old 23rd July 2019, 02:29 AM   #4
audfrknaveen is offline audfrknaveen  India
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Two different answers

I'm wondering port location has any positive or negative effect on bass. Is there anything like phase matching etc ???
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Old 23rd July 2019, 07:22 AM   #5
wonderfulaudio is offline wonderfulaudio
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The port operates in about an octave at most. With a 30hz tune, the highest freq is 60hz, thats (345/60) 5.75m in wavelength. To get boundary loading, the source must be within 1/4 WL, which is about 1.43m from the floor. Assuming a sane height of the enclosure, its location does not matter.
More so, if the tuning is lower.

There is no difference in phase. Take the port location to extreme, on top-rear, even then its going to be in phase.

Room acoustics (phase and SPL) will overshadow everything else.

Last edited by wonderfulaudio; 23rd July 2019 at 07:34 AM.
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Old 23rd July 2019, 12:27 PM   #6
bitSmasher is offline bitSmasher  Australia
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Would cooling via airflow be a factor?
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Old 25th July 2019, 06:54 AM   #7
audfrknaveen is offline audfrknaveen  India
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started building it ... see the pics
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File Type: jpg IMG_20190725_121845.jpg (488.5 KB, 43 views)
File Type: jpg IMG_20190725_121934.jpg (467.8 KB, 43 views)
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