Marantz was top of the line in audio gear in the 70's and these speakers were some of the better quality, well built speakers of that era. 8 ohms, with a frequency range from 50-20k. The rear of the speakers have a 3-way switch to select an increase/normal/decrease in the high frequency curve. These were purchased from the original owner in Pasco and used in a professional studio as playback monitors. They sound amazing. Price includes shipping but local pickup can be arranged as well.