During the 1980's and 1990's, cassette players were popular among multiple generations. Today, however, the supply chain for cassette players is nearly non-existent, making the initial stages of the CP13 project difficult, nearly leading to its cancellation.
After investing much time, effort, and deep cooperation with the supply chain, FiiO was able to continue on with the CP13 project, leading to its current release. Their goal is to give users the ability to relive those days of familiar, pure analog sound.
FiiO optimized the CP13 for superior playback by sourcing high-quality cassette components and focusing on simplified design. By removing features like recording and autoreverse, they enhanced audio fidelity and stability. The key to this is an oversized pure copper flywheel, measuring 1.2 inches in diameter and 0.16 inches thick, ensuring consistent playback with minimal wow and flutter.
The CP13's motor is powered by a high voltage 4.2V power supply, more than the 1.8V or 3V typically found in today's cassette players. This power supply works in tandem with a motor speed stabilization circuit, which increases the drag on the motor as necessary to ensure stable movement speeds - which mitigates unwanted pitch changes and also allows the CP13 to be able to handle more cassette tape types.
FiiO equips the CP13 with a custom-balanced amplification head to ensure consistent left/right channel performance. A thickened magnetic head cover reduces wear and shields against interference, enhancing durability and audio clarity. Additionally, a differential circuit boosts signal stability, achieving a higher signal-to-noise ratio and minimizing distortion for superior sound quality.
The CP13 employs the renowned JRC5532, known to some as the classic "King of op-amps." This op-amp is deployed in a fully analog audio circuit that provides a familiar, pleasant sound that will surely leave an impression.
Though ultimately restricted by the size of the cassette player's movement, FIlO engineers paid much attention to making the CP13 as compact as possible. Through the integration of manufacturing and structural design ingenuity, the CP13 ended up only being 31.8mm thick, making it thinner and more compact than most currently produced cassette players.
The CP13 features a carefully crafted dual-color all-aluminum chassis. The clearly visible "0" screws that act as a perfect complement to the square yet round design mean the CP13 is an example of beauty coexisting in harmony with ergonomics.
The buttons of the CP13 undergo hard oxidation, making them more wear and corrosion- resistant. Behind the aluminum alloy volume knob is a large analog volume potentiometer, which compared to the flat potentiometers used in cassette players is not only more reliable and provides more stable sound, but also simply feels better when used.