If we compare 2 sub that have similar spec and SQ does a sealed one provide less shaking in the surrounding environment than a ported one?
The short answer is no.
As you can see from the response curves I posted earlier, a ported sub rolls off differently than a ported sub.
If the driver is of high enough quality and you can use equalization or digital sound processing to shape the response of the sealed sub to be the same as a ported sub AND the driver is of a high enough quality that the equalization does not introduce huge amounts of distortion, they will sound the same.
