As explained on the title, I search for brutal death metal songs which the mid is reduced and the bass is boosted.

If you didn't get yet, I talk about those songs' tones:

Try these ones.

Soils Of Fate (everything)
Internal Bleeding (everything)
Acephala - Division By Zero (2010)
Bane Of Existence - Humanity's Splintered Salvation (2004)
Baphomet - The Dead Shall Inherit (1992)
Cephalotripsy - Uterovaginal Insertion Of Extirpated Anomalies (2007)
Cerebral Hemorrhage - Exempting Reality (2001)
Clitorture - Clitorture (2004)
Cumgun - Suck The Guts From My Slut (2005)
Cyanosis - Methods (1999)
Dead For Ten Weeks - Bloodline Detriment (2007)
Deeds Of Flesh - Gradually Melted (1995)
Dehumanized - Prophecies Foretold (1998)
Devourment - 1.3.8 (2000)
Devourment - Molesting The Decapitated (1999)
Digested Flesh - The Answer To Infection (2004)
Disinterment - Graveyard Fornication (2005)
Dying Fetus - Grotesque Impalement (2000)
Dying Fetus - Killing On Adrenaline (1998)
Dying Fetus - Purification Through Violence (1996)
Dyscrasia - Septical Stomach Pumped Remnants (2004)
Eternal Suffering - Drowning In Tragedy (1999)
Hidden Pride - Brutal Advice (1997)
Gorevent - Abnormal Exaggeration (2008)
Gutted - Bleed For Us To Live (1994)
Malamor - Dead To The World (2004)
Meat Cutting Floor - Rectal Quest (2013)
Mucopus - Mulch (2005)
Mortal Decay - Sickening Erotic Fanaticism (1997)
Oppressor - Agony (1996)
Prophecy - Our Domain (2002)
Pyrexia - Sermon Of Mockery (1993)
Pyrexia - System Of The Animal (1998)
Sepsism - Purulent Decomposition (1999)
Skinless - Foreshadowing Our Demise (2001)
Skinless - Progression Towards Evil (1998)
Stabwound - Bloodsoaked Serenades (2003)
Stabwound - Human Boundaries (2004)
Svin Killer - Drowning Into The Green Mass (2011)

It is only two songs, but the Crucifix 1994 demo is absolutely this vibe.

(I.e., the first two tracks on this compilation: )