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All technical information, circuit topology diagrams, phantom power voltage measurements, and loudspeaker crossover calculations published on AudioBase Online (https://audiobase.online) are provided in good faith and for general educational and engineering reference purposes only.

Electrical & Hearing Safety Notice

Working with high-voltage vacuum tube preamplifiers, 48V phantom power rails, high-wattage Class-D/Class-AB power amplifiers, and high-SPL loudspeaker systems carries inherent electrical and acoustic safety risks. Readers are advised to verify impedance loads, observe proper electrical grounding protocols, and monitor Sound Pressure Levels (SPL) to prevent equipment damage or noise-induced hearing loss. AudioBase Online will not be liable for any losses or damages in connection with the use of our technical guides.