DDFM GrandEQOf all DDMF equalizers, GrandEQ is definitely the one with the most sophisticated DSP algorithms under the hood. The goal in digital equalizer design is always to reduce the amount of digital artefacts which are introduced due to the necessarily finite sampling frequency. As with everything in life, the last few percents of optimization are the hardest, so a lot of effort has gone into creating an EQ which does the least possible damage to your audio