The Concert 9 subwoofers use lightweight Injection Moulded Graphite (IMG) woofer cones for powerful, precise bass, with front-firing ports for flexible placement. The subwoofer features built-in 2.4GHz wireless receivers (WA-2 system), enabling cable-free positioning for optimal sound. Class D amplifiers deliver deep lows, while ultra-low latency ensures audiophile-grade wireless audio without compromise.