Sunn Coliseum Bass preset

Close · 70/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

Sunn's solid-state Coliseum Bass amplifier. Its preamp uses a FET input stage, a Normal/Brite switch, separate low-bass and high-bass controls, a switchable mid and a treble control, all as discrete transistor stages. It was built for loud, clean bass with a lot of low-end shaping.

• Made in: USA
• Channels: 1

Tags: american, vintage, solid-state, bass, clean.

Schematic-derived preset files for the Neural DSP Quad Cortex and 16 Fractal and Line 6 modelers: Axe-Fx II/XL/XL+, Axe-Fx III, FM3, FM9, and the full Helix family (Floor, LT, Rack, HX Stomp, HX Stomp XL, Native).

Gridleak extracts amp parameters from original circuit schematics using AI vision — component values, gain staging, tone stack topology, tube types — then generates native preset files for every supported modeler. Every extraction is scored 0–100 and the score is published.