IMF/TDL/Elac/ Cobex, Bass woofers 6.5" 8 ohm, vintage rare, new in box, this woofer was used in the  Compact series cabinets by TDL they are considered one of the best made in their day this speaker was used in several high end systems and may be compatible with others. I have a few of these Awesome Units, They would be great as a Replacement. Upgrade or Project, I have TDL Crossover/ Input Plates and Tweeters Also, Please feel free to Inquire.