Alpine PDX-4.150 Stackable Amps
Alpine car amplifier reviews. I love the stackable design of the Alpine PDX amplifiers. All of the Alpine PDX models are the same size and can be stack on top of each other. The PDX-4.150 come with a 4/3/2 channel options. The PDX amplifiers’ damping factor means less distortion and clarity that exceeds other amplifiers. This Alpine amplifier also provides the same power at 2 and 4 Ω.