Having bought an intermediate cello with a good bottom end sound, we decided the high end was a little dissapointing so we decided to improve the sound with some new Thomastik Dominant Strings for the A & D.
Having done so, the difference is amazing. The cello now sounds like a much more expensive instrument with great tone at the top and a rich deep bottom end (original strings).
We decided to let the strings "bed in" over a couple of days, gradually increasing the tension until finally achieving tuned pitch, in order not to damage the strings on initial tuning.
Change the strings, not the cello.