More photos followoptical flaws, and need a little refurbishing (see photos).These monitorshas been checked and adjusted exactly, and they work really perfect.The monitors O6/3 are equipped with the highly sought Schulz coaxial speakers type TH315/1 - a successor of the legendary Eckmiller O15coaxial speakers produced in the 40's, and early 50's.The speakers type TH315/1 were produced in years 1966-1980 by the famous German manufacture for broadcast studio speaker - W. Schulz.The power capacity is about 30 Watt and the initiation power begin with 0,35 Watt, therefore these speakers are special suit for low power SE tube amplifiers. The impedance is about 15 Ohm, and the frequency response is from 25 Hz to 20 kHz perfect linear The TH315 has inside a special overload protection system realized with a relay. In case an overload, the relay switch automatic up the signal, delivered to the speakers, and after reduction the loudness, therelay switch the speakers automatic in operation again.