High-level noise represents a risk for health, thus an important trouble to handle. For low frequency noise generally it is employing an Active Noise Control (ANC) system. ANC systems operate generating a secondary anti-noise signal according to the superposition principle. Nevertheless, anti-noise signal generation requires techniques such as Filtered-X Least Mean Square (FxLMS) adaptive control algorithm. In this paper, a Single Frequency ANC system is evaluated to obtain an optimal step size to be employed in a Delayed FxLMS Algorithm in order to improve the system time response; thus, analysis, simulations and experiments for a prototype of Single Frequency ANC system are discussed.