A method for attenuation of low frequency acoustic sound in an acoustic dctor comprising the steps of collecting incoming sound waves in the frequency range of DC to 3000 Hz so as to provide an incoming signal S.sub.I, splitting the incoming signal into two signals S.sub.1 and S.sub.2 such that signal S.sub.1 travels through a one acoustic transmission tube a distance of L.sub.1 to the first control port of a fluidic laminar proportional amplifier and signal S.sub.2 travels through a second acoustic transmission tube a distance of L.sub.2 to the second control port of the fluidic laminar proportional amplifier, adjusting the L.sub.1 distance such that the phase of input signal S.sub.1 is shifted in relation to the phase of input signal S.sub.2 when input signals S.sub.1 and S.sub.2 arrive at the control ports of the laminar proportional amplifier.