These blocs are fantastical in my system with B&W 804, SA93 préamp and Cayin CDT 17A CD player. Powerful, sweet, no fatigue to hear. Compare to Pass Labs 150.5, it is sweeter, with more life

Vincent monoblocs SP-991 Plus are a very good amps capable to recreate a very precise stage where the sense of real atmosphere, the separation between instruments, its tonal depth, and the context in that they interfere, it is a predominant factor.
However I saw myself in the need to swap the loadspeakers terminals, but mainly the internal cables for a highly deserved extension of the highs. I obtained better result with tubes preamp. Highly recommended!