PI inspired Alpha10 2-way?Alesis tweeter/
Specifications:
*Power handling: 40 watts RMS/80 watts max
*VCdia: 1" *Impedance: 4 ohms *Re: 3.0 ohms
*Frequency range: 3,000-20,000 Hz
*Fs: 1,500 Hz *SPL: 93 dB 1W/1m
*Dimensions: A: 3-3/4", B: 3", C: 1-3/4".
* 1" treated fabric dome
* Fully shielded design
* Horn loaded faceplate for high efficiency
http://www.partsexpress.com/pe/pshowdetl.cfm?&DID=7&Partnumber=279-140&ctab=15#Tabs