Unfortunately, I cannot agree with the premise. A few days ago, I connected the SB12MNRX with the Peerless byTymphany D27TG35-06. Out of curiosity, I have now added the DaytonAudio Epique E180HE-44. As usual, I have been experimenting withthese drivers in a single test enclosure, combining them in differentways. When summing the left and right channels (L+R) into mono, Inoticed that in the high-frequency range you get a mixture ofdifferent tones, which produces a sense of harshness or an increasein distortion. Listening to Vivaldi’s Four Seasons, thecharacter of the violins changed almost constantly, and with just asingle channel (L or R) there was simply far too much reverberation.Older recordings that are less reliant on stereo separation , forexample, Fleetwood Mac , were somewhat less affected. But overall,the thesis that a single loudspeaker evaluation is “essential” issomething I cannot confirm. At best, listening to a single speakercan reveal how well the woofer and tweeter integrate: their crossoverfrequency, slope, or time alignment. Only yesterday, I attended aperformance in a church by a local string ensemble, and I was deeplyimpressed by the tone of the violins and the musicians’interpretation. Comparing that real experience to mono listening athome made the flaw very clear. Music reproduced through a singleloudspeaker in mono is simply a deception , the life, space, andauthenticity of the performance disappear.