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.
The Annotated Gilmore Girls 