You may want try a graphic equalizer. They fell out of favor in the 1980s but have become very popular with the headphone community in recent years. They can also allow you to tailor the sound of a speaker system to your particular listening room.
Schiit Audio sells three graphic equalizers: Loki Mini+ $149, Lokius $299, Loki Max $1499. I use the Lokius and it works quite well for my headphone system. It will also offer an inexpensive way to experiment with your Maggies.