Power Acoustik RZ5-2500D Amplifier vs Power Acoustik MOFO1-6KD Monoblock Amplifier

These are different tools, not rivals. The RZ5-2500D is a five-channel amp that runs four speakers plus a sub from one compact chassis, which suits a simple full-system build. The MOFO1-6KD is a monoblock built for one job: feeding a big subwoofer with 1-ohm stability and a subsonic filter. Buy the RZ5 for a complete system on a budget of space and wiring; buy the MOFO1 when you already have speaker power and want serious bass. Owners of the Razor series praise the value and the factory-radio turn-on; MOFO owners like the tower footprint and the remote gain knob, but note it needs 4-gauge power and does nothing for your door speakers.

• Choose the RZ5-2500D if you want one amp to drive four speakers and a subwoofer, especially with a factory head unit and limited mounting room.
• Choose the MOFO1-6KD if you already have speaker amplification and need a 1-ohm-stable monoblock with a subsonic filter for a high-output sub stage.