Sound Storm S4EQ 4 Band Pre-Amp Car Equalizer With Gold-Plated Front/Rear and Subwoofer Outputs Dual Color Illumination Variable Subwoofer Filter, Subwoofer Level Control, Master Volume Control Switchable Phase Selector, Fader Control, Input Selector, 2 Source Input Gold-Plated Front, Rear, and Subwoofer Outputs, Pre-amp Output: 7 V EQ Band Center Frequencies: 40 Hz, 150 Hz, 1 kHz, 20 kHz Boost / Cut at Center Frequencies: + / - 18 Db Dimensions: 4-1 / 4" (L) x 6-13 / 16" (W) x 1-1 / 8" (H) Warranty: Sound Storm Provides A 1 Year Platinum Online Dealer Warranty So Long As The Purchase Is Made Through Amazon.com