Engineering Notes

A collection of technical insights, material research, and design principles behind Pure Line Audio products — written for listeners who care about signal integrity, not marketing claims.
Electrical Noise in Audio Systems: Sources and How It Affects Sound
Electrical Noise in Audio Systems: Sources and How It Affects Sound
Electrical noise originates from power lines, electromagnetic fields, and grounding interactions. This article explains how it enters audio systems and affects performance. Read more...
Cable Shielding in Audio: What It Does and Why It Matters
Cable Shielding in Audio: What It Does and Why It Matters
Cable shielding controls how electromagnetic interference interacts with audio signals. This article explains how shielding works, the different types, and its role in system stability.     Read more...
Balanced vs RCA cables
Balanced vs RCA Connections: What’s the Difference and When It Matters
Balanced (XLR) and unbalanced (RCA) connections differ in how they handle noise, grounding, and signal transmission. This article explains how each works and when the difference actually matters in real... Read more...
Ground Loop Hum in Audio Systems: Causes and How to Fix It
Ground Loop Hum in Audio Systems: Causes and How to Fix It
Ground loops are one of the most common causes of hum and noise in audio systems. This article explains why they occur, how grounding paths interact between components, and how... Read more...
Do Power Cables Reduce Noise in Audio Systems?
Do Power Cables Reduce Noise in Audio Systems?
Do power cables reduce noise? Understand how shielding, grounding, and current stability influence electrical noise in hi-fi systems.   Read more...
Power distributor and power cable hi-fi
Power Cables Explained: What They Do (and What They Don’t)
Power cables define how real-world AC disturbances interact with audio power supplies. This article explains what power cables do, what they do not do, and why stability, geometry, and noise... Read more...
Signal Noise Explained: What It Is, Where It Comes From, and Why It Matters
Signal noise is electrical energy created by interactions between components, conductors, and reference points. It can exist below audibility while still affecting timing, dynamics, and spatial information. Understanding noise means understanding the electrical environment your system operates in. Read more...
Cable Geometry Explained: Why Structure Matters as Much as Materials
Cable Geometry Explained: Why Structure Matters as Much as Materials
Materials matter, but geometry determines electrical behavior. A practical explanation of how spacing, twisting, grounding, and stability shape performance in high-end audio cables.   Read more...
What Is Graphene and Why It’s Transforming High-End Audio Cables
What Is Graphene and Why It’s Transforming High-End Audio Cables
Graphene is an advanced conductive material used to manage noise and energy behavior in audio cables. This article explains what graphene is and how it interacts with copper and silver... Read more...
Silver vs Copper Audio Cables: What’s the Real Difference?
Silver vs Copper Audio Cables: What’s the Real Difference?
Silver and copper audio cables differ not by hierarchy, but by electrical behavior. Conductivity alone does not determine performance. Material choice affects detail, stability, and system balance, and must be... Read more...