In revewing the 20 watt per side Cary mono SE300 LX 20, (using KR 300 BXLS), Martin Collom using a variety of speakers mention concerning the Quad63, " the combination was truly mellifluous, the quad made no difficult demmand on the LX20 and the acnokwleged tonal purity of Quad was transported to a new dimension by the LX20 zero-feedback design", Stereophile,vol.22, no.8). Maybe I should let you know that I just put for sale, a couple days ago, my Cary SE300 LX20 monoblock on the Audiogon.