Headphone Amp, Grado 125s

DAVE: Well, this is a headphone amp and it just boosts the volume and makes the clarity off the hook, and then these are Grado 125s, which is just really, killer, killer portable sound.

A headphone amplifier, or headphone amp, is a low-powered amplifier that raises the low-voltage signal from an audio device so that it can be converted into sound waves by the speakers inside headphones. It works like the amps used to power full-sized speakers at a lower scale.

Grado 125s [pictured] are headphones made for the home market by Grado Labs in Brooklyn. They are stylish, reasonably priced, and good quality, but apparently not very comfortable to wear.

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