Interactive crossovers use a shim diameter larger than the shim stack clamp. The larger crossover diameter transfers force from the face shims directly into the high speed stack forcing the high speed stack to begin deflection before the crossover closes. Interaction and deflection of the high speed stack before the crossover closes softens the crossover closure event.

MXScandinavia dyno testing on Thumper Talk evaluated the performance of an interactive crossover configuration

Shim ReStackor analysis of the configuration shows the crossover closes at a shaft velocity of 26 in/sec. Due to the shim stack configuration there is virtually no change in stack stiffness or damping force at the crossover closure confirming the dyno test results.

Interactive crossover produces a "soft" crossover closure event