75us and 50us pre-emphasis curves for FM broadcast delivery, with a post-emphasis overshoot guard that prevents the curve from creating peaks that exceed the limiter ceiling — automatically bypassed in Online and HD Radio modes.
FM broadcast requires pre-emphasis: a frequency-dependent boost that tilts the spectrum before transmission, compensated by de-emphasis in the receiver. 75us for North American FM, 50us for European and Asian markets. MixBus applies these curves with precision and adds a critical overshoot guard that ensures the emphasis curve never pushes peaks beyond the limiter ceiling.
Pre-emphasis boosts high frequencies. This boost can create new peaks that exceed the limiter ceiling set in stage 10. The post-emphasis overshoot guard catches these curve-induced peaks and transparently limits them without re-processing the entire signal. The result is a perfectly bounded output that respects your ceiling setting regardless of the emphasis curve applied.
Automatically bypassed in Online and HD Radio delivery modes where pre-emphasis is not used. No manual switching needed — the delivery mode selection in stage 14 automatically controls pre-emphasis behavior. When you switch between FM, HD Radio, and Online output modes, the pre-emphasis stage intelligently enables or disables itself to match the target format.
Broadcast-grade delivery curves with overshoot protection — format-aware, regulation-ready.