Released in the late 1970's, the Optimus -X100 series is often named the baby brother to the Realistic Mach 1 series - Realistic loud speaker needs no introduction being famous for their classic 'Japanese sound that is truely awesome. Optimus X-100. Key specifications 3 way system 20Hz-25,000Hz frequency range 100 watts RMS handling capacity 8 ohms 38 x 58 x 25 cm weight: 15 kg pp Adjustment pots for mid range and tweeter horns Presented in very good cosmetic condition. No dustcovers included. All drivers are working as they should and sound lovely as you would expect from quality Realistic - the horn tweeter and mid is dynamic especially with classic rock from artists such as the Rolling Stones or Eagles. Bass speakers are re-foamed.