There are two ways to select the 'Pure' profile: by back LCD menu on the speakers or by the ADAM Audio S-Conrtol Center software to use with USB connection to the monitors. I prefer the 'maximum linear' one called 'Pure'. The ADAM S2V monitors are shipped with a non linear, pro prietary frequency response profile 'UNR'. 'Pure' selected ADAM Audio S-Control / S2V 'profiles'