Since you haven’t mentioned the make and model integrated you have all we can go on are general rules of thumb, like the 10:1 ratio. If there is a mismatch the specific result is a roll off of bass response, but even integrated amps’ pre-outs if they are really preamp outputs are likely to be low enough impedance to avoid that. The final point is the big one, we always say the preamp is like the first lens in an optical system, very important in setting the stage for what follows. How good a preamp is in there? If it’s a Naim Atom, then you should be in great shape, others…your ear will tell.