The ornamental design for a soundbar, as shown and described.
1. Sound bar
1.1 : Perspective
1.2 : Front
1.3 : Back
1.4 : Left
1.5 : Right
1.6 : Top
1.7 : Bottom
1.8 : Perspective
The broken lines depict portions of the sound bar and environmental subject matter which form no part of the claimed design. Reproduction 1.8 shows the sound bar in a state of use, wherein the broken line showing of a screen depicts environmental subject matter which forms no part of the claimed design.
Reproduction 1.1 is a front perspective view of the sound bar; reproduction 1.2 is a front view thereof; reproduction 1.3 is a back view thereof; reproduction 1.4 is a left view thereof; reproduction 1.5 is a right view thereof; reproduction 1.6 is a top view thereof; reproduction 1.7 is a bottom view thereof; and reproduction 1.8 is a perspective view thereof.