I think David is inquiring about the VTF (vertical tracking force) we are using with the DRV XV-1s. Speaking for myself, I have been running the cartridge at a VTF at the top end of the range suggested by the manufacturer (2.0 grams if I recall correctly). I know there are others who have experimented with higher tracking force and decided that a VTF above the suggested range - 2.6 grams for example - results in markedly better sound. I have been personally reluctant to exceed the VTF range suggested by Dynavector, but I am interested in others' experience here.