I was looking at the impedance curve for the Zu Omens, and there's a significant spike between 45 Hz to 125Hz, where at 45 Hz the impedance is 12 ohms, spiking at ~45 ohms at 70 Hz, and then dropping back to 12 ohms at 125 Hz. It could be the reason my tube amp had problems reproducing clean bass in those regions. There was a saturated sound when listening at volume, and fortunately the First Watt J2 is really clean in that same bass region.
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