[Brad]

These are about a year old, in excellent condition.
(I crossed them over at 1600hz).
Efficient, and high power handling.  Lots of detail, no harshness.

Here's the link for full specs:
http://www.parts-express.com/dayton-audio-amtpro-4-air-motion-transformer-tweeter-4-ohm--275-094

PM if interested or with questions