The moving mass (Mms) has also been kept low by using copper-clad aluminum voice coils (CCAW)

FS Low frequency: 45

This is where the STREAMER's "Echo Cancelling" and "Noise Suppression" technologies come into their own:

500 Hz - 30

GZHP 40-OE Packaging unit:Single The moving mass (Mms) hasWith the Ground Zero GZHP 40 OE, you can enjoy the signature Ground Zero sound even outside your vehicle. These wired on ear headphones deliver a dynamic sound, powerful bass, and a comfortable fit. Thanks to the built in hands free function and smartphone control, theyre equally suited for music, phone calls, and everyday mobile use. The foldable design and the included carrying case make the GZHP 40 OE the ideal companion for on the go. Technical