The most important part of playback is how much palpable "life" the recording can transmit into your listening room. Mono was designed to pressurize a room from a single point source. A well designed Mono playback room has all the drama and punch of a well designed Stereo room. The difference is that all the pressure and impact and presence comes from ONE point source. Which in many cases makes Mono VERY POWERFUL. VERY FOCUSED. Stereo has many many kinds of collateral damage cause from bringing the pressure from TWO point sources. For one thing if either point source in a Stereo signal is off---even by a "little" bit---the room pressure will be weakened. Meanwhile over in the Mono room---if you get the speaker to load the room correctly---EVERYWHERE is the "sweet" spot. And the room is incredibly EVEN in how it is loaded as there is all that music coming from only ONE point source. It is ALL COMPLETELY PHASE COHERENT. No issues with "balance". So in some cases it is much more powerful to hear it in mono if it was mixed down to hit you that way. So called improvements are merely alternative ways to entertain the savage breast. Not necessarily BETTER. LONG LIVE MONO.