Input sensitivity is the input voltage required by the amp to output maximum voltage so it is related to the amp's gain. So, your preamp puts out 8V max - this means that the input sensitivity of your amp needs to be less than 8. You will of course find that basically all amps will be below 8 which means that the designers of your preamp aren't dupes. They made it so that it will work with any amp so you wouldn't have to ever worry about input sensitivity....
The output impedance of your preamp is the only spec you really need but you apparently don't have that number. I would ask deHavilland and see if they will tell you. In most cases, since the designers aren't dupes, you don't have to worry about this number either but with tube preamps, you should ask.
The rule of thumb of the amp's input impedance divided by the preamp's output impedance being 10 OR MORE is pretty good to assure that your bass doesn't get lopped off.
The cases where there are some technical mismatches are in fact quite rare (unless the designers are dupes). What happens far more frequently, IMO, is that the sound qualities don't match your desires. In this case, no numbers will help you, only luck and patience will. Good luck! Arthur
The output impedance of your preamp is the only spec you really need but you apparently don't have that number. I would ask deHavilland and see if they will tell you. In most cases, since the designers aren't dupes, you don't have to worry about this number either but with tube preamps, you should ask.
The rule of thumb of the amp's input impedance divided by the preamp's output impedance being 10 OR MORE is pretty good to assure that your bass doesn't get lopped off.
The cases where there are some technical mismatches are in fact quite rare (unless the designers are dupes). What happens far more frequently, IMO, is that the sound qualities don't match your desires. In this case, no numbers will help you, only luck and patience will. Good luck! Arthur