you need the dv20x-H. the bias is a moving magnet cart with a high output, and your phono pre is expecting a stronger signal. the dv20x-l is a low-output moving coil cartridge, but the dv20x-H is meant to be of much higher output, so that it'll run properly in a normal MM phono pre.
H is for high
L is for low
or you could get an mc phono stage.
H is for high
L is for low
or you could get an mc phono stage.