small tweeters?

Not sure how small you want, but i just used the SB26STCN-4 in a two way with a 5.25 peerless heritage woofer. It was much smaller in mounting diameter and cutout diameter, but still is a very nice tweeter Active crossover around 2.5 to 3K . Great imaging and smooth response.
 
Not sure how small you want, but i just used the SB26STCN-4 in a two way with a 5.25 peerless heritage woofer. It was much smaller in mounting diameter and cutout diameter, but still is a very nice tweeter Active crossover around 2.5 to 3K . Great imaging and smooth response.

i have tried the similar sized (diaphragm wise) sb26stac and it did not work so well for me, sb21sdc and sb19st did not work either. seas 19ttf1 and s-s d2010-851300 works much better. i have also tried the old vifa d19td but i want something better