The Vintage Acoustic Research Model AR-5 Speakers from the 1970s are highly regarded for their exceptional sound quality and craftsmanship. These rare speakers are known for their distinctive design and superior performance, making them a sought-after item among vintage audio enthusiasts. Acoustic Research was a reputable brand during this time period, and the AR-5 model is considered to be a classic piece of audio history that continues to impress listeners today with its retro charm and exceptional sound reproduction. Possibly made by legendary sound designer. These have NOT been tested and I do not know any additional information.