One or more transducers may be affixed at the end(s) of a barbell to measure mechanical variables during free-weight lifting tasks. It is unclear if transducer location might affect output, a potential problem if change in performance is being monitored. PURPOSE: To compare peak velocity using dual, non-centered accelerometers during low-load barbell jump squats. METHODS: Fifty-two subjects (27 women & 25 men) with free-weight squat training experience were recruited from a university population. Subjects performed duplicate load-spectrum countermovement jump squats (CMJ) and static jump squats (SJ) (20%, 30% & 40% of the back squat 1RM) on 2 separate days in a counterbalanced sequence. A triaxial accelerometer was directly affixed to each end of the barbell midway between the lateral-most aspect of the shoulder and the thumb side of each hand. Acceleration data were downsampled from 1.5 KHz to 500Hz by averaging every 3 data points. These data were then low-pass filtered (4th order Butterworth) with a cutoff frequency of 10Hz. Velocity was automatically determined from acceleration output by integration. Peak velocity data were obtained concurrently from the 2 accelerometers. Paired t-tests with a Bonferroni adjustment for 6 comparisons were used for data analysis. RESULTS: Accelerometer-derived peak velocities from the two instruments (A1, A2) were different for CMJ at the 30% 1RM load (p = 0.006) and for SJ at the 20% 1RM load (p = 0.001). Mean differences (A1 - A2) at 20, 30, & 40% 1RM loads, respectively, for the CMJ were 4.30, 3.64, and 2.19 cm · s -1, and for the SJ were 3.94, -1.61, and 1.75 cm · s -1. CONCLUSIONS: Exercises using free weights, such as low-load CMJ and SJ, involve multi planar movements. Placing accelerometers at the ends of the barbell during these exercises may affect velocity output and, therefore, may be problematic when monitoring change in performance. Placement of the accelerometer at the midpoint of the bar or use of a lifting apparatus with a horizontally-fixed bar may obviate lift-related discrepancies in velocity output. Although not tested herein, it is likely that linear position and linear velocity transducers would have similar constraints. As contiguous accelerometer placement was not tried herein, it is unclear what, if any, contribution the accelerometers made to measurement error.