1. I tend to think the lesser 10-band digital GEQ will work better than 31-band analog GEQ like DBX 2231. Paul McCartney said that EQ in digital domain outperforms as well;
2. One critical aspect to consider is how one constructs the Equalized Loudness Contour (ELC), or Fletcher-Munson (F-M) curves, at different average listening levels, such as 40, 60, or 80 dB. When applying EQ, it's important to normalize the dB adjustments (DdB in the chart), particularly to avoid distortion in frequencies that are heavily adjusted (e.g., bass). Without proper normalization, EQ adjustments can create imbalances, distorting the original sound signature by overemphasizing or underemphasizing certain frequency ranges.