Are Fender Cabs & Heads built to fit together best?
 

Just trying to decide if it would be worth investing in a fender cab to match with the Rumble 350 head or should I expect much of the same weather through my RS210 a Berg or whatever. Thoughts?

Typically, manufacturers design amps to work best with their own cabinets, however, if you already have a few bass cabs, use those first! Don't spend the money if you do not have too. Try them out! :bassist: