Web transport systems are composed of multiple tension zones. These zones are separated by driven rolls such as calenders, bridles or nipped rolls whose speed is regulated by a closed loop controller. Given that tension regulators regulate tension by trimming the reference to the closed speed loop controller, the designer of the tension regulator cannot ignore the effects of closing the speed loop, and line speed, on the Web transport system (WTS) natural frequencies. These natural frequencies are typically computed as the eigenvalues of an equivalent translational cascaded spring-mass system. This paper discusses these effects.