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The biggest compromises in early audio receivers were caused by the power supplies and internal signal interference. When a preamplifier and power amp and tuner are housed in separate components, each has its own enclosure which isolates the low-level audio signals of the tuner and preamp from the large magnetic fields of the power amp plex, for instance. This was particularly important in the days when all audio gear was powered by tubes the voltages required by tubes, and therefore the resulting interference, could be massive but it's still true today. The heat generated by tubes was also a significant issue, causing components to both drift in performance and age prematurely.

To use Turn-by-Turn, a driver or passenger needs to push the OnStar button on the vehicle's mirror, which makes a cellular voice call to OnStar. The car's occupants then tell the operator where they want to go, such as a street address or a point of interest like a theater or park, and then wait a few seconds for the information to be downloaded as cellular data to the car. The operator than hangs up.

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