This is for my Prefix/Supercap combo. I have heard both these cartridges but in different systems. The Delos on a Rega P9 and Technics SL1200, the Helikon on a LP12/Lingo2/Aro. The Delos definitely sounded like having a bigger macro dynamic range. The Helikon sounded more fluid, but then how much of it is due to LP12/ARO I do not know. Has anyone compared these two cartridges ? I have a good offer on a low mileage Helikon and also a Delos.