Hmmm, different than the results I get if I just Google that, and this is more in line with what my server manufacturer has found, although they have gone to a switch mode hybrid over the linear power supply, but this is where I was attempting to steer you regarding the difference in weight:
While high-fidelity audio depends on the synergy of the entire chain, the most critical part of an audio server for ensuring high-quality, jitter-free, and clean sound is the power supply.
A linear power supply (LPS) with low noise and low ripple provides the stable voltage necessary to prevent electrical noise from degrading the digital signal.
Here is a breakdown of why this and other components are crucial:
1. Linear Power Supply (Most Important Component)
The power supply is the "heart" of the server, transforming incoming AC power into clean DC power.
- Significance: A noisy power supply, typical in many computer-based servers, introduces jitter (timing errors) and noise that affects the Digital-to-Analog Converter (DAC) down the line.
- Key Attributes: Look for high-quality toroidal transformers and substantial capacitor banks (over 70,000 uF in some premium designs) to ensure a smooth output.
2. Output Stage / USB Isolation (Critical for Signal Integrity)
How the digital data is outputted from the server to the DAC is the next most critical factor.
- The Problem: Running USB audio directly off a generic motherboard introduces significant noise.
- The Solution: A specialized, low-noise USB interface card (such as a SoTm USB card) that provides a dedicated, clean, and stable clock to the USB output significantly reduces noise before it reaches the DAC.
3. Software/Operating System (Crucial for Performance)
- Purpose: The software (e.g., Roon Core, Daphile, Volumio) manages the library, but its implementation matters. A "headless" or dedicated audio OS with minimal background processes reduces CPU load and electrical noise, improving sound quality.
4. Storage and Clocking
- Storage: While SSDs are standard for speed, the key is separating the operating system (on a smaller SSD) from the music files (on a separate SSD) to reduce I/O contention.
- Clocking: Precision clocks (e.g., femtosecond clocks) are crucial for reducing jitter in the USB interface or network card.

