Make three copies of the new made layer and apply the Free Transform selection to turn the copies around and place them the same way you may see below:

Create Professional Software Box in Photoshop CS

Choose the next tool to draw a decorative clamp on the loudspeaker edge.

Create Professional Software Box in Photoshop CS

Create Professional Software Box in Photoshop CS

Blending
Options-Gradient Overlay

Create Professional Software Box in Photoshop CS

Gradient?s parameters:

Create Professional Software Box in Photoshop CS