Eminence Delta-12LFC 12" Driver 4 Ohm Eminence's Delta-12LFC 12" speaker is optimized for high power bass in sound reinforcement systems, bass guitar combos, club music systems, and stage monitors. Eminence LF models are specifically designed with extended XMAX to deliver more bass than standard models and provide "a true woofer" for three-way applications. Vented extended pole piece, 4 ohm nominal impedance.