What about phase/time alignment and in-ears? Allmost all serious in-ears contain more than 1 driver. If you have a 3 way earpiece (for example with three drivers), the frequency spectrum is divided into three parts and you get two crossover…

During touring I discovered that my in-ears do not always have the same sound (which would be very nice, so I have always the same reference). Sometimes the in-ears sounded very muddy and far away. Because of this I started…