How many watts speaker should I buy to add onto tablet?

[AC Question]

i want a basic add-on speaker for my samsung galaxy tablet (7 inch), just as a boost for playing music or BBC i-player in the house - how many watts will be sufficient?

 

[B. Diddy]

Duplicate, see response here: http://forums.androidcentral.com/as...sung-galaxy-tab-4-7-inch.html?highlight=watts. Thread closed to prevent parallel discussions.