An aspect of the invention is a testing system for applying loads to a test specimen. The testing system includes the actuator and the first support portion supporting the actuator. The actuator is configured to support a first end of the test specimen, while a second support portion configured to support a second end of the test specimen. In various embodiments, combination of sensors that can include displacement sensor and/or accelerometer(s) provide associated output signals that are received by a displacement compensator that is configured to provide a displacement output signal indicative of differential displacement between first end and the second end of the test specimen.