Hi jdg,
The Grande 6s are the next level for the TS2s. The do use the same driver, but in a larger cabinet. The increase in volume does add more bass and now the speaker has a more balanced sound. Other changes include new damping, and larger ports. The sensitivity remains the same and 8 watts is more than enough power.
6moons will have the review out in mid to late January.
Thanks and Best regards,
Louis