https://fuzzybabybunny.smugmug.com/Westone-W60-Teardown/ Photos are deliberately a little bit flat to show off detail in the shadows and highlights. My Westone W60s developed an audio balance issue after dropping my Microsoft Surface while it was hooked up to my DragonFly Red DAC and playing music. The right side volume suddenly became lower than the left, requiring an extra 6dB to compensate. Measuring the internal resistance at the MMCX port, the right side is 15.60 ohms while the left side is 15.16 ohms, so I think that explains why the right is lower in volume than the left. Normally IEMs have the same internal resistance on both sides, to within +/- 0.02 ohms. Unfortunately, I have no idea why the internal resistance might have increased due to the drop. All drivers still sound fine. Interestingly enough, there is barely any circuitry. The six drivers are wired in a simple series with a passive crossover consisting of two capacitors or inductors.