I've heard the amp, and its cousin the I-3, but with other speakers, B&Ws and Vienna Acoustics. I think the SimAudios excellent, high value candidates for de Capos or Dulcets. I note that the recent review/award in Hi-Fi + (issue 36) suggested the I-3 as an ideal partner for the Dulcets, suggesting either the I-5 or I-3 is well worth a try with De Capos. Let us know how it goes....Happy hunting!