Foreword: Needs no introduction but I'll do it anways. The UERM is the predecessor to UE's UERR and presents a brighter (and some would say more accurate) take on neutral. Even after its discontinuation, it has continued to be SBAF's preferred in-ear reference. Frequency Response Impulse CSD THD Analysis: Apart from its neutrality, the UERM is characterised by its 9k peak (repeatable on multiple couplers, not an artifact of resonance) which boosts the airiness of the sound and the perceived top-end extension. Due to the effects of insertion depth, take the extension shown on FR with a grain of salt. Relatively clean decay on CSD. Fast too. Nothing much to report. Right channel THD measuring slightly higher than left for some reason. Will need to play around with it again. Third order distortions are pretty run-of-the-mill for BA systems.