Horn has large chip on driver mounting flange. Driver can still be mounted and would still function fine. No other cracks or chips. The Altec 511B, HF driver was used in Altec models such as the A7 'Voice of the Theater', horn loaded speakers. ALTEC speakers : ALTEC 600 B 600B: ALTEC Woofers: 600 B 600B: 12"8 Ohms: U: 0: Reference info ONLY.