RS-1

The top of the line Grado's, mahongany earpiece, hand built to great sound.

Spec:

Vented diaphragm
Wooden air chamber
UHPLC copper voice coil wire
UHPLC copper connecting cord

Tranducer type: dynamic
Operating principle: open air
Frequency response: 12-30
SPL 1mV: 98
Normal impedance: 32ohms
Driver matched db: .05