A short comparison between the Classic and Bass versions
Full review of both Classic and Bass 2017 w/MMCX cables can be found here
Classic vs Bass
The Classic version seems to follow the older Mk2 model tuning, and while I cannot confirm regarding the Bass one, it is now being advertised as taking the Mk2 as a basis as well. Whichever the case, overall they’re both very similar, and interestingly enough with different ear tips the both 2017 models can sound even more similar than their naming would suggest. As noted above, they do rate a different frequency response, 10 Hz~28 kHz for the Classic and 5 Hz~22 kHz for the Bass. True or not, there’re certain audible differences on of both ends extensions. The Bass can reach a deeper sub-bass with a more weighted overall low-end, putting some extra fullness to the mid-bass region, yet keeping a clean midrange all the way. The Classic sounds leaner and flatter in comparison and also faster, while the Bass has a slower decay and more natural texture. At the midrange the Bass edition feels just a little tad less prominent, whereas the Classic is more forward tuned as the Mk2 was supposed to be. Getting to the upper mids and mainly at the treble as a whole, changes are similarly noticed. The Bass is a tad smoother, a little more laid-back and less bright, something that contributes in making it less prone to sibilance. The Classic sounds just a bit brighter and some extra extension can be perceived on real A/B comparison. Again, the different eartips used play an important role in this regard as well. Apart from that, the overall presentation, imaging and timbre is pretty much identical, with slight differences in the tonality, being the Classic more suited for the ‘purist’ and the Bass for the ‘musical’ type.