Because acoustics and EQ are complementary, you first need to improve your room acoustics. Measurements can help to understand your actual situation. Considering the maximal measured peak, following graph gives estimation of the equivalent absorption of your walls.
An important point : before doing any correction, try to find best place for your loudspeakers, try different presets if you have and optimize as far as possible. Correction works best if you have less problems to solve. Some steps are recommended before using any electronic correction : if possible, …
Information about the target slopes : with standard loudspeakers (dome in high frequency and closed or bass-reflex box in lows) and in a mid size room, at a distance of about 3m, the bright timbre target is nearly -1.05dB/oct, the balanced is -1.4dB/oct and the warm is -1.75dB/oct. The Harman …