It is a subwoofer equipped with a 330W power amplifier using ice power. The sound has low distortion and good response, typical of modern subwoofers. I removed it with a cleaner, but traces of deterioration around the LCD remain (Daiki Goto)
Maintenance information: 2026.2.4 operation confirmed
Accessories: manual, power cable
Main specifications: Subwoofer with built-in amplifier (sealed type) 180mm NEWLLD aluminum/pipe hybrid cone x 2 crossover frequency 40 to 180 Hz variable frequency 29 to 240 Hz amplifier output 330 W (CLASS-D digital) H433 x W230 x D300 mm 16.5 kg 2008 release serial No. 0000231 (Hirokawa Katsumasa)