How to Build Powered Speakers With External Power Supply and Audio Input Circuit?

The discussion centers on building powered speakers that operate with an external power supply and accept audio input signals. Clarification is sought regarding the type of powered speaker intended: whether it is a self-powered speaker with an integrated amplifier accepting low-level inputs (e.g., 100mV line-level signals via RCA connectors), or a speaker relying on an external electromagnetic field powered directly at the voice coil, as found in vintage valve radios (dynamic speakers). The concept of self-powered speakers involves incorporating a power amplifier stage to drive the speaker from low-level audio inputs. Alternative, unconventional audio transmission methods were briefly mentioned. The conversation highlights the need to specify power output requirements and input signal types (line-out, microphone, digital) to design appropriate external circuits for amplification and power supply.
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