A speakerphone system comprising: an input signal path having a receive end connected to receive a far-talker signal and having a speaker end connected to a first transducer for generating an audible output in response to said far-talker signal; an output signal path having a microphone end connected to a second transducer for generating a near-talker signal, said output signal path having a transmission end connected to transmit said near-talker signal to a source of said far-talker signal; a first echo controller positioned along said output signal path, said first echo controller being configured to manage a level of an acoustic echo component of said near-talker signal transmitted to said source, where said acoustic echo component is a consequence of coupling of said audible output to said second transducer; and a second echo controller positioned along said input signal path, said second echo controller being configured to manage said level of said acoustic echo component of said near-talker signal, said second echo controller having a dynamic highpass filter with dynamic filter characteristics that are preferential to passing high frequency components of said far-talker signal and that are dynamically selected on a basis of inhibiting said coupling of said audible output from said first transducer to said second transducer, said dynamic highpass filter having an adjustable cutoff frequency at a low frequency band of the audio frequency spectrum, wherein selection of said adjustable cutoff frequency establishes said filter characteristics of said second echo controller at said low frequency band, and said second echo controller comprising a filter control component configured to select said adjustable cutoff frequency based upon both a recent strength of said far-talker signal and a recent strength of said near-talker signal. an input signal path having a receive end connected to receive a far-talker signal and having a speaker end connected to a first transducer for generating an audible output in response to said far-talker signal; an output signal path having a microphone end connected to a second transducer for generating a near-talker signal, said output signal path having a transmission end connected to transmit said near-talker signal to a source of said far-talker signal; a first echo controller positioned along said output signal path, said first echo controller being configured to manage a level of an acoustic echo component of said near-talker signal transmitted to said source, where said acoustic echo component is a consequence of coupling of said audible output to said second transducer; and a second echo controller positioned along said input signal path, said second echo controller being configured to manage said level of said acoustic echo component of said near-talker signal, said second echo controller having a dynamic highpass filter with dynamic filter characteristics that are preferential to passing high frequency components of said far-talker signal and that are dynamically selected on a basis of inhibiting said coupling of said audible output from said first transducer to said second transducer, said dynamic highpass filter having an adjustable cutoff frequency at a low frequency band of the audio frequency spectrum, wherein selection of said adjustable cutoff frequency establishes said filter characteristics of said second echo controller at said low frequency band, and said second echo controller comprising a filter control component configured to select said adjustable cutoff frequency based upon both a recent strength of said far-talker signal and a recent strength of said near-talker signal.