Difference between downstream speed and Home Hub 4...

Using a number of speed checkers I am getting a downstream speed of approx 7mb to my router but only 1.9mb from my home hub4 to my devices. This is irrespective of whether I connect to my router by cable or wireless. I have reset my router and have disconnected all telephone cables from their sockets for about 40 minutes before reconnecting and resetting the router. Any suggestions as to why this should be and how I can improve this?
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