Astell&Kern AK500AP Amplifier and Power Supply

The AK500AP was developed as a small form factor to maintain the same design concept of the AK500N. Although its size may be small, it's able to deliver a remarkable level of performance through a combination of rigorously-selected parts and perfect design.

Approximately 3,000 times faster refresh rate was achieved by implementing a very high-frequency Switching-Mode Power Supply (SMPS) used in aerospace applications rather than a commonly-used linear power supply design, ensuring a full response to even the most complex waveforms. Despite its very small size, the power supply provides a full 1100W of capacity. In addition, a full balanced design was used to minimize noise interference, and Power Factor Correction (PFC) was used to completely eliminate surge noise.

Since capacitors typically found in amplifiers can introduce sound-coloring, a DC feedback loop design was implemented, and no capacitors were used. Furthermore, the input buffer, driver, and output stage were completely isolated from the audio amplifier unit in an independent design to eliminate cross-interference. The outstanding structure uses separate constant-voltage circuits to eradicate any deterioration in sound quality. The exceptional speed, power, and control capabilities of the AK500AP are no match for any other comparable power amplifier. All of these features were carefully selected and implemented to ensure the most accurate interpretation and playback of complex audio data transmitted from the AK500N. Audiophiles can now experience unparalleled audio closest to the original sound through the AK500 series.