An output shaft of a rotating electrical machine and a drive device input shaft are disposed at different shaft center positions. The apparatus includes a vent member associated with each of the ports which is movable between an open position to admit air to the zone and a closed position to block air from the zone. The system has a first mass movable relative to the ground plane, wherein the external force induces an oscillation in the first mass relative to the ground plane. The second codeword can have a code rate that is configured to be less than the code rate of the first codeword.