Last Friday I've bought a brand new set of ESL-X's from a local dealer here in The Netherlands. It's my first set of electrostatic loudspeakers ever so excuse me if I sound like a noob. What I have noticed after setting them up is that one speaker is noticeably louder than the other. Measuring with a decibel meter confirms there's a 1.5 dB(A) difference between the 2 speakers. I've already tried the obvious, swapping cables, swapping amps, swapping power supplies and swapping positions but there's no improvement. While the audyssey calibration on my Marantz SR7015 receiver managed to correct this and they absolutely sound great now I don't feel good about this. Also, I intended to use them with my tube amp in the first place which doesn't have a balance control. Is this expected behavior with those speakers that will go away after running them in for a couple of days? Or is this simply a case of a defective unit? Any advice would be appreciated.