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Isn’t that just adding a diode?
speakers are dc, right??
Speakers are fed with AC. Feed large amounts of DC to the voice coil of a speaker and it will overheat and fail.
That's why a lot of speakers are destroyed by under-powered amplifiers. The ampmidiers reach their amplitude limits and clip, which basically means it feeds DC to the speakers.
And directional speaker cable - don't get me started!!