So I have two lines running into my house - the first is a POTS line with UBA, analogue phone, and VoIP delivered over a separate VLAN (with QoS at both ends of the connection) at 11Mb/s - this has a master splitter already installed and with 11Mb/s I'm guessing is pretty much as good as I'm getting. The second is a single jackpoint naked DSL connection with no master splitter. It was installed about 2-3 years ago by Chorus. This is synced at 4.5Mb/s but I know there's a line fault which is booked in for an overlay.
Would there be any benefit to getting a master splitter installed on the naked DSL line bearing in mind there is only one jackpoint, and the DSL router is plugged directly into it.