Buy GOOD speaker cables and GOOD interlinks, spikes under your speakers, and then you don't need an equalizer, been there, done that.
If you need an equalizer, then there is something not right in your system.
Speaker cables X tube XT360 or something similar.
Interlink you make yourself from not the cheapest gold plated plugs and wires from a phone/internet line, these interlinks are MUCH better then $200 interlinks from a audio store.
Spikes, you speakers sound completely different.
Oh, what good speaker cables do for your sound outside the speaker, they do the same for your sound when you make inside your speaker.