Head Gear Reviews by John Buchanan

    5.00 star(s)
       The Stax Sigma series panoramic earspeakers. 1. Models and nomenclature The Stax SR-Sigma panoramic earspeaker was introduced in 1977. There have been 3 versions officially released and 1 after-market version commissioned. The original low bias, grey grille 1977 Sigma model (bias voltage of this model being 230V or “Normal”). The 2 um thick driver used was later recycled in the very successful Stax Lambda Semi-Panoramic earspeaker. The first release Sigma had a fabric coated, round bodied “kettle type” cord that connected the...