MB Quart QB250 25 cm (10″) Active Subwoofer System for BMW 1er E81/E87

Specifications
25 cm (10″) Subwoofer
250 Watts RMS
500 Watts MAX
Phase Shift 0° / 180°
Bass Boost 0-12 dB @ 45 Hz
Low Pass Filter 50 – 200 Hz @ 12 dB
Subsonic Filter fixed at 27 Hz @ 24 dB
Auto Turn-On
RCA Inputs, High Level Inputs
Detachable Terminal Connectors
Bass Level Remote Controller

Fits into:
BMW 1-Series (E81, E87, 3- and 5-Door),
left trunk compartment