A method for generating a speaker feed for driving a sealed speaker having a resonance frequency, said method including steps of: in response to the speaker feed, generating a feedback signal indicative of an excursion of the speaker; and in response to the feedback signal, equalizing an input signal to generate the speaker feed, wherein the speaker feed is equalized for driving the speaker with: a desired frequency response above the resonance frequency; and an at least substantially flat frequency response in a variable sub-resonance equalization band without exceeding a speaker's excursion limit, where the sub-resonance equalization band extends from the resonance frequency down to a variable cutoff frequency, and the cutoff frequency is determined in response to the feedback signal, wherein the feedback signal is indicative of a peak amplitude of frequency content of the equalized speaker feed in a range of sub-resonance frequencies of the speaker and wherein the cutoff frequency is determined in response to the feedback signal such that the sub-resonance equalization band has a width which is a decreasing function of the peak amplitude of the frequency content of the speaker feed in said range of sub-resonance frequencies, wherein said step of equalizing the input signal includes boosting the input signal at frequencies in the sub-resonance equalization band, with the boost having a sloping frequency-amplitude response where a slope is set to overcome or cancel the speaker's natural falloff below the resonance frequency. in response to the speaker feed, generating a feedback signal indicative of an excursion of the speaker; and in response to the feedback signal, equalizing an input signal to generate the speaker feed, wherein the speaker feed is equalized for driving the speaker with: a desired frequency response above the resonance frequency; and an at least substantially flat frequency response in a variable sub-resonance equalization band without exceeding a speaker's excursion limit, where the sub-resonance equalization band extends from the resonance frequency down to a variable cutoff frequency, and the cutoff frequency is determined in response to the feedback signal, wherein the feedback signal is indicative of a peak amplitude of frequency content of the equalized speaker feed in a range of sub-resonance frequencies of the speaker and wherein the cutoff frequency is determined in response to the feedback signal such that the sub-resonance equalization band has a width which is a decreasing function of the peak amplitude of the frequency content of the speaker feed in said range of sub-resonance frequencies, wherein said step of equalizing the input signal includes boosting the input signal at frequencies in the sub-resonance equalization band, with the boost having a sloping frequency-amplitude response where a slope is set to overcome or cancel the speaker's natural falloff below the resonance frequency. a desired frequency response above the resonance frequency; and an at least substantially flat frequency response in a variable sub-resonance equalization band without exceeding a speaker's excursion limit, where the sub-resonance equalization band extends from the resonance frequency down to a variable cutoff frequency, and the cutoff frequency is determined in response to the feedback signal, wherein the feedback signal is indicative of a peak amplitude of frequency content of the equalized speaker feed in a range of sub-resonance frequencies of the speaker and wherein the cutoff frequency is determined in response to the feedback signal such that the sub-resonance equalization band has a width which is a decreasing function of the peak amplitude of the frequency content of the speaker feed in said range of sub-resonance frequencies, wherein said step of equalizing the input signal includes boosting the input signal at frequencies in the sub-resonance equalization band, with the boost having a sloping frequency-amplitude response where a slope is set to overcome or cancel the speaker's natural falloff below the resonance frequency.