Headroom n. : See Headway, 2.

Example:
What is the deal with hyundai tiburon's Headroom?

Taxonomy
Headphones, HeadRoom, Amp, headphone amp, DACs, Stereo Headphones, Ear Canal, iPod, AKG, ear, Audio Cables, Micro Line, Audiophile, Wireless, Earbud, Best Headphones, Guaranty, Noise Canceling.

Defination from the web:
High-end headphones, headphone amps and accessories.