Networking & Protocols
Single-ended refers to an unbalanced audio connection or circuit design where the signal is carried on a single conductor with a separate ground reference. It is simple and cost-effective but more susceptible to noise and interference than balanced systems.
In a single-ended or unbalanced connection, the audio signal travels along one wire, while a second wire or shield serves as the ground return path. Any noise or electromagnetic interference picked up by the cable is added directly to the signal because both share the same reference point. This makes single-ended wiring more vulnerable to hum, buzz, and radio-frequency interference, especially over long cable runs.
Typical single-ended connections include RCA phono cables in consumer audio equipment and TS (tip-sleeve) jacks used for electric guitars and unbalanced line outputs. The simplicity of single-ended wiring makes it inexpensive and adequate for short distances, such as within a rack or between nearby components. However, in professional studios and live sound systems, balanced connections using XLR or TRS cables are preferred for their superior noise rejection.
In amplifier design, the term single-ended can also describe a circuit topology where the output device operates in a single active phase rather than in push-pull configuration. Classic valve amplifiers often use single-ended Class A circuits that produce low power but characteristic even-order harmonic warmth.
While single-ended connections and circuits are not inherently inferior, they must be used within appropriate distance and noise constraints. In well-designed systems with short cable runs and proper grounding, they can deliver clean, high-quality audio performance.
