The Martin Audio Blackline M3 is a dedicated electronic system controller designed to optimize and protect the legacy Blackline series of loudspeakers. Housed in a single 1U rack unit, it serves as a central hub to manage crossover points, equalization, and system limiting.

• Active Crossover: Provides precise frequency splitting for bi-amped systems like the Blackline H2 and H3, or for combining full-range tops with sub-bass units.
• System Optimization: Tailors the EQ specifically for the Blackline range, significantly enhancing low-frequency performance when used with models like the F12, F15, and F215.
• Speaker Protection: Features high-quality limiters that prevent drivers from being overdriven, ensuring long-term reliability even under heavy professional use.