Acoustic Research Holography Imaging M 4.5 Floor-standing Speakers for Sale. I bought these speakers in 1992, kept them in really good condition and have had them since. Excellent sounding speakers that any audiophile would appreciate. Her are the details and reviews of the speakers. http://www.audioreview.com/product/speakers/floorstanding-speakers/acoustic-research/holographic-imaging-m-4-5.html http://www.hifi-classic.net/review/acoustic-research-m4-61.html