The ornamental design for a speakertower with circular media dock, as shown and described.
FIG. 1 is a perspective view of a speaker tower with circular media dock, embodying my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a front elevation view thereof; and,
FIG. 7 is a rear elevation view thereof.
The broken lines shown are included for the purpose of illustrating portions of the speaker tower with circular media dock that form no part of the claim.