Pick four Hz/dB reference points and 3 functions to blend between them. Click generate to create a target curve file to download and use in your room correction software. A graph will show the shape of the curve with logarithmic Hz axis.
Curve types:
Linear: Just a line from the starting dB to the end dB
Curved: Very similar to the popular harman curves. Amplifies the low end of the curve and then drops quickly.
Cosine: Drops to the halfway dB point after half the Hz-distance in a (co)-sine shape