This thread confuses me. Eighteen days later, the OP has not contacted Walthers about a design problem - - - no openings in the shell to let the sound out.
Now it is a lemon? And the eBay seller does not provide returns?
Dunno, if it were me, on March 8th, I would have contacted Walthers instead of starting this thread. I am sure from past experience that if the problem is not design-related but rather a faulty speaker, Walthers will willingly evaluate the speaker assembly.