The ESB HR 11 SW is an active car subwoofer from the Harmony series, specifically engineered to fit discreetly inside the rim of a spare tire. This space-saving design allows you to add deep bass to your vehicle without sacrificing valuable trunk space. It features an 11-inch dual voice coil driver and a Class D amplifier that delivers 200 W RMS and up to 400 W of peak power, ensuring a punchy sound across a frequency range of 30 Hz to 160 Hz. To ensure durability and acoustic stability, the enclosure is constructed from die-cast aluminum, measuring 360 x 360 x 126 mm. You can easily integrate it into your existing audio system using either high-level or low-level inputs. The included remote control gives you direct access to essential adjustments, such as the volume gain, phase switching between 0° and 180°, a bass boost of up to 12 dB, and a low-pass filter adjustable from 50 Hz to 150 Hz, so you can tune the low end to suit your music and car interior.