Amplified subwoofer impedence
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I just got through reading Jason Victor Serinus's last 2 articles relating to how we judge audio "quality" in "How we see it". He has a real point when he notes that many (if not most) people don't use live acoustic sound as a reference and judge audio qualities very subjectively based on what they "like". I am a strong believer in using real unamplified instruments (including) voice as THE ultimate reference for how a piece of audio gear should sound. It is said that humans have poor "audio" memory but strangely I have found this to be completely false.
What does the impedence look like at the low end of a speaker that uses a powered woofer? Do they load the input of the amplifier and just waste power to create a uniform load or since most amplifiers are a low impedence voltage source do they just let the impedence increase at the low end?