How did talking on speakerphone on public transport go from being totally unacceptable to ubiquitous? (Posed by model) - Getty ...

This allows the controller to more efficiently match its drive to the AC frequency demanded by the motor at a particular speed, and is responsible for the “gear change” sound of many electric ...

Exactly how loud is the T? An expert said a sound level meter’s reading at one infamous station was “outrageous.” ...