JBL ARENA SERIES 12" COMPONENT SUBWOOFER WITH 2- OR 4-OHM SELECTABLE IMPEDANCE ARENA SERIES 12" COMPONENT SUBWOOFER WITH 2- OR 4-OHM SELECTABLE IMPEDANCE, 800 WATTS RMS, 2400 WATTS MAX POWER HANDLINGArena subs feature JBL's patented Selectable Smart Impedance (SSI) technology. You can choose 2 ohm or 4 ohm impedance with the flip of a switch, giving you an easy way to configure the Arena for your changing needs as you expand your system. Its dual 2. 5" voice coils are suspended in separate magnetic gaps, allowing them to apply extra force at low and high sound levels. A vented pole piece helps dissipate heat when the sub is working hard.