I recently bought the Matrix XLR interconnects. I put them between by Esoteric CD player and the preamp. They did exactly what people report. Quite background, good dynamics and layering of the soundstage, bass increased and is controlled. The single interconnect made a big improvement.
The 2 matrix power cables I added as well for the amps had a much smaller impact in comparison, but still contributed.
The 2 matrix power cables I added as well for the amps had a much smaller impact in comparison, but still contributed.