Foreword: The Zombie was loaned to me by Rhapsodio for my honest review. Priced at $1,800, its cost is second only to their 20-driver Infinity model. The Zombie sports 8 BA drivers and 1 dynamic driver per channel. Frequency Response Rescaled Impulse CSD THD Analysis Treble peak doesn't seem to be present in subjective listening. If anything, the upper registers are dulled and lacks energy. Null in the 5-6k region. Rhapsodio's IEMs seem to exhibit this trait, particularly their Solar model. What's with 5k D2 spike in both channels? Looks to line up with the nulls in FR, that could explain it. Not exactly the cleanest impulse, a lot of rubberbanding going on. Subjectively, the bass is loose and the midrange is relatively clean. Quite a difference in transient response between the two which could be chalked up to driver incoherency. Does the CSD anomaly at 600Hz explain this? Must investigate further. Typical THD response for a hybrid. Clean in the bass but the BA's third order takes over in the mids. Overall, not something you would listen for fidelity. The bass is bloated, tends to bleed easily and just meshes poorly with the rest of the frequency response.