The blue box on the picture changed my (audio) life, period.
It’s a compact design, 2nd order filter 320/1500/8000 hz with precision hand made air-core, chokes… special for Goto/Royal Sound Japan… the best crossover I ever owned and listened in my system… had Pioneer D23, several Werner Jagush/Jabo’s, still have Thomas Mayer’s… this blue gizmo is the absolute winner!
🥇