MTX Thunder TM452 2Ch Marine Amplifier Thunder Marine Series Class D Monoblock Marine Amplifier MOSFET power supply Conformal coated circuit board Sealed covers keep amplifier controls and speaker terminals dry Gold-plated screw terminals 4 ohms: 45 watts x 2 chan MOSFET power supply Tuned Bass EQ (0-12 dB bass boost) LED power indicators Preamp RCA outputs