I get the best-sounding sustain and smooth harmonic distortion when I run the amp dimed.

A police car, traveling southbound at a speed of 40.0 m/s, approaches with its siren producing sound at a frequency of 2 500 Hz.

But what do you do if you already have equipment that you bought, on the cheap, and you don't know whether or not it is a refurb or not?

How was I to know that in this scapegrace's larkings about town she had twice encountered a young man who looked like a hero of romance […]