The JBL BassPro Nano is an ultra-compact, under-seat active (powered) car subwoofer engineered by Harman. Measuring just 260 mm × 195 mm × 74.6 mm (roughly 10" × 7.7" × 2.9"), it is JBL's smallest powered subwoofer enclosure, designed specifically to fit into tight spaces beneath front passenger or driver seats without sacrificing cabin legroom or trunk storage.