you're lucky , but these Heresy speakers are not HDBR , these are 1978 Heresy 1 HBR raw birch black , ( no grilles ) , badges are the very rare Lazer copper , the HF drivers are the Alnico K-77 round tweeter / K-55V Alnico midrange on a K-700 metal horn , woofer is the K-22 square magnet , the crossovers are E networks .