st.Rock is a small audio equipment manufacturer based in Uzhgorod, Ukraine, focused on guitar amplifier modeling, impulse response loading, and reactive load box technology. The company is known within the tone-chaser community for its compact engineering team and for shipping ambitious products aimed at players who want to run tube amplifiers silently or replace them with high-fidelity digital emulations.

Its product line centers on the REACT:IR and REACT:IR II — reactive-resonance load boxes that combine an attenuator with a built-in impulse response loader supporting long IRs (up to ~170–190 ms). The flagship AMPERIUM Live is a floor-format processor featuring tube-amp emulation built on the company's proprietary DOMNA (Direct Optimized Modified Network Analysis) modeling approach, with stereo FX loop, onboard effects, and a neural-network profile player for user-made captures. The company also offers AMP:IR, an OEM impulse-response module marketed to other manufacturers, along with companion VST/plugin software.

st.Rock has 1 product cataloged on Equipboard, including Guitar Power Attenuators. Their gear is featured by 2 artists, with the strongest followings in Rock and Metal. Notable users include Ryan "Fluff" Bruce and Sergey Golovin.