Amp Up Your Skills with the 2026 Low-Voltage Cabling Practice Test – Stay Wired for Success!

In a TRS plug, the sleeve is the common ground reference, while the tip and ring carry the signal signals. When a positive DC voltage is applied with respect to ground, the positive potential is carried by the primary signal conductor. The tip is the conductor designated for the main signal path (left channel in stereo configurations or the primary signal line in mono), so it is the one that carries the positive DC voltage relative to the ground on the sleeve. The ring serves as the second signal line (right channel) or can be unused in mono, but it is not the primary positive DC reference. Therefore, the tip is connected to the positive DC signal voltage.