Why waste valuable energy by letting the drum hit the soil randomly? For many years, the soil and the roller drum were considered to be two separate systems. Thanks to Dynapac’s engineering team, they were able to recognise that the soil and drum actually work together as one system. This finding opened the door for the development of the Dynapac Seismic system. All vibrating drum and soil combinations have their own unique natural frequencies. Dynapac Seismic automatically detects the frequency of the soil characteristics, works together with it, and applies the correct amount of energy exactly when required for optimal compaction and efficiency.