Helix Pure F-Series PF K100.2 4 inch 2-Way Component Speakers 40w RMSHELIX PF K100. 2 The entry into the HELIX sound world Enter the HELIX sound world with our PURE F speaker series. The powerful F Series gets the maximum power out of your amplifier thanks to its 3 Ohms technology. In combination with the exceptional sound performance with powerful bass, clear mids and detailed highs, an exciting sound experience is bound to occur. Features High sound quality with deep bass, clear mids and detailed highs Powerful