This is the Mini S, the semi-open version of the Mini C reviewed just earlier. Since these headphones are related, it would not be a bad idea to read a bit about the Mini C. https://www.superbestaudiofriends.o...s-a-new-standard-for-closed-headphones.12546/ ETA Mini S Frequency Response It's a different flavor of neutralish compared to the C. Instead of a slight midrange emphasis, the Mini S has low bass emphasis. Subjectively, the bass emphasis is there but not as high as the measurement above would suggest. The bass doesn't intrude into the high bass or lower mids. There's no excess thickness often heard on bassier headphones. There's a very tiny BBC dip going on in the upper mids which I find desirable, especially with natural mic'd recordings in reverberant venues. Note that this BBC dip is the opposite of the Harmon target when it comes to the upper mids. The Mini S is a semi-open design that often comes with associated usually "better" sonic qualities: snappier transient response, more spacious headstage, improved responsiveness to small signals, etc. The Mini S does scales a bit better the the Mini C with more expensive gear, but like the C, it doesn't need an "amp" or "DAC". It sounds good great from the Android dongle and great from the iFi GO Blu. (Audioslave and STP are sure sounding pretty good and energetic instead of softpoo). This one to me is a home run, that is if you can get away with semi-open design. If you need a closed design and better isolation, the Mini C may be a better choice. I'm going to try to sneak in some isolation measurements later if I have time. I didn't realize this before, but these headphones can transform like Transformers toys.