Scanspeak D2905/930000, a long term favourite tweeter from the highly regarded classic range offering exceptional transparency and detail.
Suits ProAc Response 3.5 and many others.
Featuring a hand coated textile dome and carefully designed pole piece / rear chamber. The phase and distortion performance is still regarded as exceptional after 3 decades. A top choice that has been used in many revered designs from the mid 80s onwards.