Turn the device so that its front is visible.

Remove the channel dial by pulling up on the dial firmly.

Remove the S50 by pulling it up and off of its connecting posts.

The front plate is now removable, but has a fairly strong adhesive so extra force will be required to pry it open.

Use an iFixit opening tool to pull up both sides of the speaker plate. They should come up easily. Pull firmly on the center to break the adhesive.