@IBFrankie 

Why would you think it could not?

I have Spectrum, and a variety of d/l speeds over the year. From different vendors as well.

I have never thought to even think that any router that is made for Cable would not work?

I've even used an Archer A20 which is close to a C7 without a problem.

Only thing I could think about is IF you have a Spectrum Modem/Router. The unit has to be BRIDGED mode to work well (as it would have to be for any other router).