Monitor AUDIO GOLD 50 Well-known acoustics, excellent condition, been in use for a year, the sound is very full, subjective of course. But it’s not expected from such generally small bookshelf speakers. Gradient intro Rare acoustics from Finland. The speakers are original Seas, the same coaxial driver that was used, for example, in the famous flagship model Gradient Revolution, housing with a Helmholtz resonator (You have to hear how they sound!!) Frequency Response 60-200 Hz +/-2 dB, 45 Hz -6 dB Resonance frequency 2800 Hz Impedance 8 ohm Recommended Amplifier Power 20-150 W Sensitivity 86 dB / 2.83 V / 1 m Speakers- 1 x 170mm fiberglass mid range, 1 x 25mm coaxial aluminum dome Operating principle Helmholtz resonator built into the vent to suppress half-wave resonance Dimensions: 23 x 83 x 20 cm Weight 10 kg Made in Finland The acoustics themselves are in excellent condition, but the paint on the bottom is a little peeling.