Obligatory photo (from DUNU site): Impressions here: https://www.superbestaudiofriends.o...ars-reviews-impressions-and-discussion.10501/ Because I feel like it and also because there are plenty of FR graphs of the DUNU Studio SA6 floating around, I will start with measurements other than FR. All measurements were taken with the bass boost switch turned to off. The bass boost is only a few db - quite tastefully done. At $550, the DUNU Studio SA6 are a decent value. Note I have not heard the Moondrop stuff yet, which are supposed to be giant killers, or at least very high value. The Studio SA6 are decent in terms of technicalities. If we turn back the clock only a few years, the SA6 would be right up there with $1k IEMs. Tonally, the SA6 has a bit of that "Asian" tuning, but much much milder than that of the DUNU ZEN (analysis here: https://www.superbestaudiofriends.o...dunu-zen-iem-measurements-and-analysis.10638/) Despite the milder V-shaped tuned, I do hear a bit of a 4-5kHz peak / ringy stuff which took me a period of time to acclimatize. (@rhythmdevils: I wonder if this 4-5kHz stuff I'm hearing will make your head explod). Initially I preferred the overall tonal presentation of the ZEN, despite it's screwier FR, to the SA6. I think the reasons is the ZEN having a more pleasant distortion pattern in the highs (much lower third harmonic to second) and maybe the ZEN having a less pronounced peak at 4kHz, but rather a broader, yet higher amplitude bump in the upper mids. The bass is rather interesting for a BA IEM. It's rounder and fuller than usual - however, it still doesn't quite slam like DD bass. The bass does seem to be a bit slow at times, a tiny bit behind, compared to the mids and highs. Anyway, here are the distortion plots: DUNU Studio SA6 Distortion Behaviors Traditional Visualization DUNU Studio SA6 Distortion Behaviors Alternate Visualization Distortion behaviors indicate BA type drivers (closely grouped despite SPL highish third harmonic) Second harmonic in the lows tends to be higher than third harmonic. Could this by why the bass is less BAish and rounder and fuller? Distortion has two notches in the lows. Is this an indication of ported bass? That at these points, could the ports be doing most of the job, thus allowing the driver to not have to try so hard? Overall, distortion is about Andromeda level for BA types (better than U18t, worse than Ara). Not bad, pretty good actually, considering the price.