HSU ported subs currently are double ported. They also come with a single foam plug. You run the sub in 'Max Extension' or 'Max Output' mode, depending on plug insertion or not. There is also a backpanel switch to be set according to the plug insertion condition.
I have never experimented with this, since even in Max Extension mode, it goes plenty loud enough, even in a room which is on the large side for the sub.
The plug is not intended to 'convert' the sub to true AS, but just vary port tuning, as near as I can 'figger.
I have never experimented with this, since even in Max Extension mode, it goes plenty loud enough, even in a room which is on the large side for the sub.
The plug is not intended to 'convert' the sub to true AS, but just vary port tuning, as near as I can 'figger.