MAF Noise-Suppression Filters TDK MAF Noise-Suppression Filters are miniaturized audio line filters featuring a high attenuation of cellular bands from 100MHz to 2.5GHz. MAF filters can suppress the spurious emissions from these bands by up to 50dB. The TDK MAF Noise-Suppression Filters limit audio signals' total harmonic distortion plus noise (THD+N) to low levels. As a result of the low THD+N, MAF filters cause no sound quality degradation in audio lines. These TDK filters are ideal for noise suppression in earphones, speakers, and microphones in smartphones, tablets, portable game consoles, and more.