OK, I took a chance and installed a pair of these in my beloved Cerwin Vega D9s. I knew the tweeter was the weak point of this venerable speaker pair.

What an amazing difference! All the harshness gone, just sweet crystal clear highs. Together with these speakers formidable base creds, even at power levels well. above the 300watts rated, these tweeters absolutely kill!! I highly recommend them. A massive improvement over the factory units...