The JBL BassPro II is an active car subwoofer designed to add depth and richness to your vehicle's audio system without requiring a separate external amplifier. It features a built-in Class D amplifier that delivers 100 W RMS of power through a 165 mm woofer, utilizing a four-coil voice coil system for stable and efficient performance. This setup allows the unit to produce frequencies ranging from 20 Hz to 120 Hz, ensuring you feel the low end of your music clearly. Its enclosure is constructed from MDF panels in a bandpass design with a single bass reflex port and a closed rear chamber, which helps focus the sound. To blend the subwoofer seamlessly with your existing speakers, it includes an integrated crossover with an adjustable cutoff frequency between 70 and 100 Hz and a 12 dB per octave slope. Measuring 312 x 410 x 242 mm, the unit fits into various trunk spaces and can be fine-tuned from the driver's seat if you choose to add the optional remote control. This makes it a practical choice for drivers who want a significant boost in bass while keeping the installation straightforward.