Secondly, a completely flat LF response sounds wrong and is not perceived as accurate, Harman's testing discovered that most people prefer a natural amount of room gain, (about a 6dB shelving at around 60hz), when testing various DRC software, ones that targeted a ruler flat LF response when normalized to the midrange and treble were rated as thin and bright sounding. Think of the xcurve, many have questioned its validity, and the same argument applied to target curves at higher frequencies above the rooms transition. The problems I have with most room correction software is that they try to address high frequencys above the room transition, based on a target curve that may or may not be appropriate in consideration with the room and speakers. IIR filters can only address phase and frequency simultaneously, while FIR filters are capable of independent adjustments. Click to expand.Actually, any eq applied to a minimum phase response aberration will simultaneously correct the phase and response.
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