The Alpine PDX Series is a recipient of the 2010 CES Innovations honors award. Every year at the world?s largest consumer technology tradeshow, the Consumer Electronics Show (CES), the Innovations Designs and Engineering Awards program recognizes the most innovative consumer electronics products, such as the PDX Series for the In-Vehicle Audio category.
PASMag.com:"The amp sounds fantastic, just sips current compared to my old amps, and looks great."
mobileelectronics.com.au "In essence the Alpine PDX-F6 does indeed provide a totally transparent sound performance, which is precisely what a 'sound quality' amplifier should provide."
InCar Entertainment "The PDX-F6 is an extremely accurate amplifier that remained well defined no matter what genres of music I threw at it."
Power Output to the Extreme

If the amp gets too hot, the Thermal Protection circuit kicks in and gradually decreases output power until it cools down. Once cool, the power output automatically increases back to the previous level. If the circuit detects a Low Battery condition, it will gradually decrease power output if battery voltage becomes too low. Once the battery voltage increases, power will be restored. This interruption-free design allows for non-stop enjoyment with no hiccups or drop-outs, just clean, clear output.
New Reference Grade Output Stage
Ultra-Wide Frequency Response: This super-wide, industry leading frequency range offers listeners unparallel sound quality and detail that bests even the most high-end audiophile equipment. 5Hz-100kHz for 4ch, 5Hz-400Hz for Mono (+0,-3dB)
Total Harmonic Distortion(THD+N) vs. Power: The all-new PDX series amplifiers are not your typical class-D amplifiers. Traditionally, class-D amplifiers have not been known for both low distortion and wide frequency response. These new PDX amplifiers are the first ever class-D amplifiers to break tradition and trump the amps of yesterday. The PDX-F6 is synonymous with extremely high resolution and detail.

Total Harmonic Distortion(THD+N) vs. Frequency
Uniquely PDX, distortion actually decreases at higher frequencies, resulting in a clean and clear signal where your ear is most sensitive to distortion. -<0.005% THD+N @ 1W, <0.05% THD+N @ rated power.

Signal to Noise: These amps are capable of unheard of S/N ratios up to 95dB S/N @ 1W, 122dB S/N at rated power for extremely clean, uncolored sound. Forget unwanted background noise or static. The PDX amps deliver crystal clear music every time.
Damping Factor: With ultra-low output impedance, the new PDX offers extremely controlled, tight bass for unprecedented sound quality. Ratings are >500 for F6.
Power Output to the Extreme
Beefed up Power: The PDX power supply delivers tremendous headroom with low distortion and noise. PDX amplifiers have an extremely high total system efficiency of ~80% (power supply is rated at >90%, output stage is rated >90%).
Low Impedance Stability: These amps are stable at low impedances and are capable of their rated power from 2 to 4 ohms for all models. This allows excellent flexibility with multiple speaker and subwoofer loads and is adjusted automatically.
Certified Power From Birth, Guaranteed: Each PDX amplifier comes with its very own birth-sheet. PDX amplifiers are tested and documented to show their true actual output.
Power Management Processor: PDX amps incorporate Alpine?s new Power Management circuit. The Power Management Processor controls all aspects of amplifier performance, monitoring voltage, temperature and output to ensure uninterrupted power output for non-stop listening.
Manual: http://support.alpine-usa.com/products/documents/OM%20PDX-F6_F4.pdf
Link: Alpine Electronics of America, Inc.