Why is duplicating speakers a bad thing?
When sound waves intersect, they combine, creating, in effect, a new sound. You are not likely to notice this if the intersecting waves are substantially different from each other. However, if the intersecting waves are the same, then the resulting harmonic spectrum can be substantially different from the orginals and this you are likely to notice. Furthermore, what you hear will vary if you change position. With a pipe organ, there are so many sounds bouncing around that the combining of the sounds has little or no effect on the sound quality. In an electronic organ, there are relatively few sound sources so the effect of the intersecting of the waves from those sources is more noticeable. However, if you have 2 (or more) speakers producing exactly the same sound, the combination of the waves from the 2 speakers may be quite different from the originals and will sound somewhat unlike a pipe organ. The basic rule of thumb of electronic organ is that the same sound should never emanate
