This Heavy Earth is a boutique amplifier and effects pedal builder based in Portland, Oregon. The company was started in April 2021 by Shea, who had previously operated under the name Transmutation Devices before transitioning from modified clones to original circuit designs. All builds are produced to order from a small workshop, with a focus on heavy and extreme music styles including death metal, doom, black metal, and crust.

The lineup centers on high-gain distortion, preamp, and utility pedals built around versatile tone-shaping controls — dip switches, toggles, and multi-band EQ stages intended for aggressive guitar and bass tones. Notable pedals include the Flesh Rot distortion, the Hesher preamp, the Death Moth (previously released as the TWD Satanist), the Crypt Boost, the Spectral Gate, the Abduction, the Impaler Mid EQ, and the C.R.E.A.M. EQ. Amplifier offerings include the Flesh Rot 60W mono head, which translates the pedal's gain character into a full amplifier format.

Beyond hardware, This Heavy Earth has partnered with Aurora DSP on T.H.E. Suite, a plugin version of its signature tones for use in digital rigs and studio production. The brand maintains a low-key marketing footprint, relying on demo videos and word of mouth within heavy-music communities on platforms like Reverb and The Gear Page.

ThisHeavyEarth has 1 product cataloged on Equipboard, including Guitar Power Amplifiers.