DarkMythras

Walnut:
It is harder and denser than Mahogany so the tone is brighter, but the open grains make for a complex midrange that seems to be compressed in some frequencies, but dynamic in others. There’s a nasal response to rhythms, while solo notes jump out. It has a lot of advantageous features of the other main guitar woods. It has a snappy attack and solid lows like Ash, but with smooth highs like Mahogany, and textured mids like Alder. The drawbacks are that it’s heavier, and more stubborn in its sound. It doesn’t respond to random pickup changes. The pickups have to be well suited to the guitar. A Walnut body will dictate the tonal signature of the guitar more than the other main woods. A heavy piece will dampen the mids to produce an overly nasal and lifeless sound, so it needs to be light and open grained enough to resonate the main guitar frequencies.

from here: Guitar Wood FAQ - Wood Types & Tones