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The PDX series of Alpine amplifiers all share the exact same exterior dimensions at 7-9/16 x 10-1/8” x 2”. This commonality allows the amplifiers to be “stacked” vertically allowing multiple amps in a smaller space, and capitalizing on the now popular stacking capabilility that the PDX amplifiers invented in the first place.

Just when it seems like we’ve reached the pinnacle of development on something, a new product comes along like Alpine’s PDX series of amplifiers. After Jason Kemmerer, Senior Engineer/Product Manager at Alpine of America explained a number of improvements and changes Alpine made to the popular PDX line, we decided to review the Alpine PDX-F6 four channel model for ourselves. The Alpine PDX-F6 is the most powerful 4 channel amp in the series of full range Class D products. It is rated at 150 watts per channel into either 4 or 2 ohms, and it has a full retail price of about $849.95.

 

FEATURES

The PDX series of Alpine amplifiers all share the exact same exterior dimensions at 7-9/16 x 10-1/8” x 2”. This commonality allows the amplifiers to be “stacked” vertically allowing multiple amps in a smaller space, and capitalizing on the now popular stacking capabilility that the PDX amplifiers invented in the first place. To make that space even smaller, the latest models have been reduced in height by 20% compared to the previous generation.

 

The innovative plug-in speaker connectors are retained, and now the power connections are also done on a removable high current plug in connector. Two 30A fuses are mounted between the speaker and power connectors, which will accept 8 gauge and 4 gauge wires respectively. A nice metal cover fastens in place with a screw, and hides all the control settings from accidental adjustments or tampering fingers. These controls are pretty straightforward, there are a pair of gain pots, and each pair of channels can be configured in all pass, high pass or low pass modes with the built in -12dB/oct crossovers. The filters have a frequency range of 30Hz to 400Hz.

 

An all new semi-regulated power supply design brings with it improvements to the thermal and voltage protection circuits, as well as a reduction in noise, and an increase in power efficiency. The thermal management in the Alpine amplifier prevents the amp from shutting off, by gradually reducing the available output power until the amp thermally recovers. This technique allows the music to keep playing for much longer periods, and in most cases you’ll never even know it was happening.

 

Internally, the new Alpine PDX amplifiers are basically an all new design, and use something Alpine calls “Global Modulation” to deliver an exceptionally wide bandwidth, very low noise amplifier. The net result is a full range Class D amplifier with sonics that rival (or better) a good traditional Class AB design. Another improvement is a reduction in the output impedance, again equaling or bettering the best traditional Class AB designs. Power supply current is taken care of by four N-Channel MOSFETs, and the 100V output devices are also N-Channel MOSFETs. Power supply capacitance measures a total of 6600µF, and the output stage employs 16,400µF of capacitance.

 

Read on for Full Results

 



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