Altec Lansing 770A Electronic Crossover Biamplifier - Bass preset

Verified · 82/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Altec Lansing 770A Electronic Crossover Biamplifier is a specialized audio component that splits an audio signal into high and low frequency bands for separate amplification, designed for biamplified loudspeaker systems. Altec Lansing built this type of equipment for cinema sound systems and professional installations requiring precise frequency management. The bass channel represents one half of this biamplification system.

• Years produced: 1960–1972
• Made in: USA
• Channels: 2

Tags: american, vintage, bass.

Schematic-derived preset files for 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.