Nice sound, very selective and precise. Less annoying than the usual metal dome tweeter but very good for brass instruments. Better to cut it higher than 3500hz, 12db/oct Linkwitz-Riley. Seems they won't meet distorsion till they'll die, so don't exceed the volume if you're not sure the crossover is perfect for them. They're so little that you can add them in a normal loudspeaker as a super-tweeter to make the high emission more refined. They're not so sensible, 89db it's not so much, but increasing volume they won't delude. Don't try them without capacitor: max 4.7 uf, no more. Better results are obtained with 2,7uf in series and 0,7mH in parallel to the tweeter, trumpet became extremely realistic and tweeter won't make women voices metallic.