Customized magnetostrictive actuators from ETREMA Products Inc. are used as seismic vibrator sources.  Actuators of different size and power are in use corresponding to the measurement task. Therefore power supply and source control have to be adapted. For seismic purposes usually sinus sweeps with a frequency band from 100 Hz up to 10000 Hz and a length of some seconds will be deployed. In hard rock around one hundred meters exploration coverage is possible while the resolution is in the meter scale. Due to control of amplitude and phase a multiplicity of applications with several synchronized sources is possible and part of our research (SPWD).