Studiocraft 300, Engineered by Bose corporation USA Well playing walnut veneer version of the Studiocraft 300ST speakers: Engineered by Bose corporation USA. Beautiful sound, which Bose also guarantees. The edges are not dried out and are in perfect condition! The speaker cabinets are used. Some signs of wear here and there, but certainly nothing interfering with the sound. Other than that, they are in good condition, see photos! With Tweeter overload. Impedance 4-8 ohms. Sensitivity 85 dB. Recommended AMP.Power 15-60 Watts. A Syncom computer-tested loudspeaker. General information: Made by Bose, 2-way system with double bass speaker. 60 watts RMS 4-8 ohms 85 db/watt. 85 Watts peak power. Tweeter overload protection Syncom computer tested. Weight incl. packaging material: approx. 14.2 kg. Carefully packaged and well protected!