40 db may or may not be enough gain, depending on how much gain your preamp and amp have as noted by Swampwalker.
Here is a link to the KAB Calculator
Here is a link to the KAB Calculator
Pre amp for low output cartridge
I recently committed to buying Dynavector Demo cartridge at my audio dealer, and absolutely fell in love with the sound. For the past 15 years have been using Dynavector 10x4/5 which has out put of 2.5mv, high for a MC. My onboard phone section has 20-40 db of gain. I'm bringing the pre amp in tomorrow to adjust the gain and resistance. Did I make a mistake here, or is 40 db enough to add to the preamp gain?