There is something that I wish to understand.
The svs pb16 has 3 3.5" round ports which comes out to a cross area of 186.2cm^2
I don't know the sd of its 16" driver.
For a 15" driver like sw115-4 has an sd of 855 so the port area vs sd is 21%.
Would the svs pb16 chuffed at low frequency high spl? Would it need around 1/3? May be the 16" has a ridiculous sd?
The svs pb16 has 3 3.5" round ports which comes out to a cross area of 186.2cm^2
I don't know the sd of its 16" driver.
For a 15" driver like sw115-4 has an sd of 855 so the port area vs sd is 21%.
Would the svs pb16 chuffed at low frequency high spl? Would it need around 1/3? May be the 16" has a ridiculous sd?
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chuffing/port compression is a function of many parameters:
driver, box volume, port dimensions/proportions, drive level across frequency band
get winISD software and use it to simulate the system behavior
you will need to juggle all parameters to find an optimal arrangement
but try keep port air velocity under 20m/s at max output
no sim software is perfect but will get you in the ballpark
driver, box volume, port dimensions/proportions, drive level across frequency band
get winISD software and use it to simulate the system behavior
you will need to juggle all parameters to find an optimal arrangement
but try keep port air velocity under 20m/s at max output
no sim software is perfect but will get you in the ballpark
Most Sd for half-roll suspensions figure 1/2 the surround width as diameter.
Scaling the picture, looks like the SVS PB16's Sd would be around 160.6 square inches, or 1036.13 square centimeters.
The ports probably chuff a bit at full output (CEA2010-A burst test peak levels of 116.8dB at 20Hz, 119.9dB at 25Hz, 122.5dB at 31.5Hz at 2 meter outdoors measured by Audioholics) but increasing the port area to 1/3 the Sd would require such long port length the cabinet volume would have to increase to a size unacceptable for many users.
There is usually a bit of "wind noise" associated with explosions and pipe organs at those levels anyway 😉
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