✓ Noise Cancelling: The algorithm in the HELIX BT HD STREAMER's BT chip filters out background noise such as vehicle noise and road noise to enable clear communication while driving

The solidly built and equally impressive-sounding mono amplifiers deliver outstanding top performance

it signals: "Be careful

Schwarzer Gehäusebezug

Diaphragm material: 3D HQPP (High-Quality Polypropylene)

4" Aero Port - 10cm 1 Farad Power Cap ✓ Noise Cancelling: The algorithmMT Audio's installation accessories include a range of high quality aero ports in various sizes and lengths. These aero ports can be easily installed and used to tune your subwoofer enclosure. The funnel opening enables clean reproduction without air noise and can be installed in a short time. The aero ports can be glued in or pre drilled on the side for a fixed position. The end pieces are pluggable and should be glued in place when the center piece