A Type-C "mini dongle" priced at around 10 $, equipped with a main controller、decoder, and operational amplifier, boasts astonishing specifications and delivers excellent sound quality, easily surpassing the top-of-the-line consumer sound cards of the past - this is the triumph of Moore's Law in the audio field.
However, when it comes to appreciating and exploring hardware, it's never just about looking at specifications. The value of those old sound cards lies precisely in the places where parameters cannot measure.

1. The power supply and electrical environment
The small tail's all power comes from the Type-C interface (usually 5V, with limited current). In order to achieve high performance with extremely low power consumption, it must rely heavily on the integration and efficiency of the chip itself. This leads to situations where it is prone to "foot softness" and sound field compression when driving high-impedance headphones or performing music with large dynamics. The sound card, on the other hand, draws power directly from the computer power supply (+12V, +5V), and the ample power reserve provides a more relaxed and linear working area for the analog output circuit (especially the operational amplifier and power amplifier chips). When driving high-impedance headphones or performing explosive musical passages, it is more calm and stable.

2. Sound tuning
The primary goal of modern high-performance DACs is zero distortion, which is why many small tail devices tend to have similar sound characteristics: high resolution, high signal-to-noise ratio, and a clean sound base. However, sometimes this "absolutely correct" sound can appear too cold and straightforward. The charm of sound cards lies not in reproduction, but in "tuning". Limited by chip performance, engineers use carefully tuned circuits and components (such as specific operational amplifiers and capacitors) to "enhance" the sound, creating a unique sound aesthetic: warmth, richness, and an "analog flavor". This sound may not be "real", but it brings a sense of immersion and musicality that many modern high-performance devices cannot provide. It is a pleasant distortion. The sharpness of the Diamond MX300, the elegance of Turtle Beach Santa Cruz, the versatility of Creative X-Fi, and the unique MIDI playback of Yamaha... In the past, a hundred flowers bloomed, but now one stands out. It's up to the enthusiasts to choose.

3. Functionality and Ecosystem.
A classic old sound card serves as a functional hub, featuring multi-channel input and output, hardware DSP effects (EAX, A3D, etc.), and connecting to a vast software ecosystem (players, soft synths, wavetable and FM synthesis, retro games, editing and creation, testing platforms, etc.). This level of playability and scalability is unmatched by mini-tailgates.

4. Sentiment
This is the part that cannot be quantified by parameters. A well-preserved ISA/PCI sound card carries the design aesthetics of the golden age of PC hardware and represents nostalgia for a specific technological period. It embodies a kind of "industrial art": personality, charm, and story, which are sentiments that modern products lack. If what you pursue is the ultimate cost-effectiveness and convenience in "listening to music", then a small tail is the ultimate answer, and researching old sound cards indeed has no meaning. But if what you pursue also includes the process of "playing with hardware", the joy of exploring different sound aesthetics, feeling the warmth of technological history, and marveling at the ups and downs of competition stories between different manufacturers, then researching old sound cards not only has meaning, but its value becomes increasingly precious in this era of pursuing ultimate efficiency.