What speaker's walls/baffle/floor base is carbon fiber solely. A .030-.050" veneer does not make a speaker carbon fiber nor does a Rosewood veneer make a speaker rosewood.
Carbon at a thickness to resemble a wood cabinet would be very brittle in nature if using sheet form to construct. It will need to be thermoformed to make it very stiff and rigid. How many speakers are thermoformed with carbon entirely? Zero!