1. A method executed by a processor of a computing device, the method comprising: transmitting a first calibration signal to a first speaker, the first calibration signal causing the first speaker to generate first output over a first time period; transmitting a second calibration signal to a second speaker, the second signal causing the second speaker to generate second output over a second time period that is non-overlapping with the first time period; receiving a first microphone signal from a first microphone, the first microphone signal corresponding to the first output from the first speaker over the first time period; receiving a second microphone signal from the first microphone, the second microphone signal corresponding to the second output from the second speaker over the second time period; computing a first coefficient of a first fixed filter for the first microphone based upon the first calibration signal and the first microphone signal; computing a second coefficient of a second fixed filter for the first microphone based upon the second calibration signal and the second microphone signal; and subsequent to computing the first coefficient of the first fixed filter and the second coefficient of the second fixed filter, applying the first fixed filter and the second fixed filter to an acoustic signal captured by the first microphone.