1978 I became an audio enthusiast I owned the Mac C28 preamp and the 2105 power amp. I met a guy which was 100% blind we became friends low and behold he was an audiophile; I invited him over to listen to my system, within 5 minutes he said that`s enough what I hear is DARK AND VALE VERY POOR LEADING EDGE at the time I didn`t understand. He began tutoring me in how to and what to listen for what`s good and bad as far as amplification is concern. He also made a suggestion I should get rid of the Bose speakers 901`s series 2`s, out went the Mac and the Bose speakers In came Audio Research SP3a preamp, David Hafler mono blocks and Maggies Typany1D`s. For about 40 yrs. its been Audio research and Maggies, 3 month ago I up graded to the Pass Labs XP30 preamp, X 350 power amp and held on to the Maggie 3.6`s. My next upgrade will hopefully be speakers the 20.7 Maggies.