The Morel EW 638 is a 6 inch 8 ohm Woofer from the Elite range featuring the Morel Uniflow aluminium diecast chassis, Hybrid™ Neodymium/Ferrite mixed magnet system, 3 inch Hexatech voice coil and a damped composite polymer cone. This unit has a (large) vented pole, a high maximum linear excursion of 12mm & low Qts & Fs. In common with all Morel woofers, the rated power handling is considerable at 150w rms, 1000w peak.
A full datasheet can be downloaded from the bottom of this page.
Decoding Morel type numbers: EW= Elite Woofer; 638= 6 inch woofer, 3 inch voicecoil, 8 ohm impedance.