...

best sound quality. These amps are stackable, yes - stackable! Installation and multi-amp configurations are a snap with Alpine's PDX amps.PRODUCT FEATURES:Class-D;1/2 Channel Operation;Stackable Installation Design;Thermal Management Processor;Adjustable Crossover (HP/LP);MOSFET Power Supply;DC-DC PWM Power Supply;MOSFET Final Outputs;STAR Circuitry;Auto Over-Current Protection;Top Mounted Blue LED Power/Status Indicator;Integrated Wire and Mounting Screw Terminals;One Side Terminal Layout;Gold Plated RCA Input Connectors;Continuously Adjustable Gain Control;Gold Plated Power Screw Terminals;4-Layer Glass Epoxy PC Board;Speaker Quick Connect.

...

The Alpine PDX-2.150 amplifier is for the true car audio enthusiast ? for those who want the best power, sound quality, and efficiency, all from a compact size. Get the most out of your system with Digital PDX.

...

Ohms/ Stackable Installation Design/ Thermal Management Processor/ Auto Over-Current Protection/ Gold Plated RCA Input Connectors/ 4-Layer Glass Epoxy PC Board

...

awesome power from a compact frame. These small-but-mighty amps free up valuable space and run so cool they can be stacked together for a sweet multi-amp setup. The PDX-2.150 2-channel amplifier supplies 150 watts of full-range power to each channel, plenty of power for the most demanding component speaker systems or most subs. Beefy internal components and clever engineering keep the power output strong and the noise low for superb fidelity and control. Adjustable frequency filters tailor the amp's output to your specific system. Front-mounted controls make post-installation adjustments a snap. Gold-plated RCA inputs and power connections resist corrosion and signal degradation. Nifty speaker wire plugs ensure a tight connection and guarantee that your speakers work in unison.