PreSonus Eris Sub 8BT - Active 8-Inch Studio Subwoofer with BluetoothAdding a subwoofer to full range speakers enables you to hear the low frequency foundation of your mix more accurately so you can make better informed decisions and create more translatable mixes. The surprisingly loud, 100 watt Eris Sub 8BT drops down to a molar rattling 30 Hz, so you'll hear the full sonic spectrum and produce better mixes. For EDM and hip hop producers, in particular, a subwoofer is a must have. Although compatible with a variety