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From first post of this thread:
2. Balanced phone output with two JAN6418
How can this be done? This is technically impossible, so we cheated. The DAC circuit and headphone amplification circuit of N3Ultra are fully differentiated but the timbre circuit, since we are using a pair of JAN6418 only, is singled-ended. We need to perform Balanced to Single-end before the timbre circuit, and Single-ended to Balanced after the timbre circuit. While N3Ultra is not a fully differentiated design from source to output, we have included some serious engineering to handle the correction properly. We are so confident that we even explain the constraint in advance.
Can we install four JAN6418 into N3Ultra to achieve a genuine fully-balanced design? This will involve more space and we can easily achieve that by increasing the width of N3Pro by 10mm. Unfortunately, using a quad-set of JAN6418 will consume more power, shorten the duration, generate more heat, and increase background noise, those are the real problems that stop us from using four JAN6418 in U3Ultra.