I have always wondered how often plugs are used for those subwoofers which offer plugs to help tune the subs. I know Hsu, SVS, and Outlaw provide plugs for at least some of their ported subwoofers.
It would be reasonable for a manufacturer (who did not really believe it is beneficial to use plugs) to simply provide customers with the added assurance of being able to tune the sub; the cost of a plug is usually very small compared to the total cost of a good subwoofer. I think the earlier ported SVS subs did not come with plugs while Hsu has had them maybe since their first sub(?)!
So, if you have a sub that offers port plugs, Please state:
1. Brand
2. Model
3. Number of ports on the sub.
4. Number of ports on the sub you plug.
Note some people may look at this as some type of evaluation of the different brands and models, but I think those who have been around for awhile understand that the decision of whether or not to plug (or partially plug) a sub is more likely determined by the room effects (determined by the placement in the room) than which model sub it is.