A stereo record has almost twice the amount of information packed into the groove as compared to a mono recording. Something must have been lost to gain the L+R information. Tracking has to be easier for a mono recording. It's kinda of like a high quality B&W photo; the rich textures, the sharpness and detail are so good that it is hard to imagine it in color, or if there is a color version it seems to take away from the picture. I heard some old mono recordings once on a buddy's Quad ESLs with Quicksilver amps. I could imagine a top notch mono system consisting of a Quad ESL with a mono tube amp and using one side of a dual mono type preamp. The Quad ESL being a good choice in my mind because it is a single point source- and it is fast.