The ornamental design for a settopbox with speaker, as shown and described.
1. Set top box with speaker
1.1 : Perspective
1.2 : Front
1.3 : Back
1.4 : Left
1.5 : Right
1.6 : Top
1.7 : Bottom
1.8 : Reference
The broken line showing of a room setting in figure 1.8 illustrates the environment of the claimed design and forms no part thereof. The broken lines in figures 1.3 and 1.7 illustrate portions of the set top box with speaker which form no part of the claimed design.