The SoundStream AR4-1800 is is one of the best true 75 watts x 4 at 4 ohm amplifiers that we have tested considering its price. This 4-channel amplifier is more than capable of driving one or two subwoofers but was designed to drive two sets of components speakers for your car . The AR4-1800 has excellent power at a low cost. How much power can it really output? We put it through it's power paces.

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