Speaker Mods?

Hello:anyone knows who makes quality mods for speakers such as changing tweeters and upgrading the crossover?
i currently own a pair of paradigm refernce v-40-2 and while i like the amount of bass it gives the high freq could be a little harsh at moderate levels,i need a speaker about this size and found it difficult to find a small speakers w/the paradigm bottom end at a reasonable price and therefore an upgrade path may be a viable alternative,thanks so much.AL
my system:
sim audio moon i-5
resolution audio transport and dacs.
synergistic res ic and dh labs q-10 speaker wire,i'm looking for a more delicate and refined performance without
sacrificing detail and neutrality.