EqABX

Using Equalizer APO?
http://equalizerapo.sourceforge.net/

Are you happy with the filter that you made?
Do you want to make sure that you actually hear the difference and not just think you do?

Take a randomized blind test and find out for sure.

Put the EqABX.exe file where you keep your filters.
by default it's C:\Program Files\EqualizerAPO\config

Name the files that you want to compare A.txt and B.txt

Also create an empty file called test.txt and inlude it in your active configuration in EqualizerAPO.

Now run the program and test until you are satisfied.