I haven't been feeling well recently, coming down with a slight "something" (as mysterious as Brainwavz new offering) but I'm pretty sure with the wide-bore tips the a serious bass rolloff, definitely not warm or bassy. Switching to the small small-bore tips (small in size and in bore) the bass definitely evens out, but still isn't what I would call bassy.
[...] I'm pretty sure though the very low end (sub-bass? Whatever it's called) is either neutral or lacking.
With the wide-bore tips, they are definitely warm with a good amount of bass, but still not what I'd refer to as being very "bassy" (just for that everyone knows, my main headphones for music are the Etymotic ER-4S and UERM, two very neutral IEMs, among others in my collection, but they are my favourites among the neutral ones).
Probably 5 dB, but not much more (in my ears). They have a good amount of ground tone, wherefore they sound quite warm.
Though, I don't really like the wide-bore tips. Why? They are too thin-walled and flabby, wherefore it takes me some time to get a good fit and seal.
With the narrow-bore tips, bass and ground-tone increase by about 1.5 dB, but ground-tone also extends higher, wherefore lows sound mightier. Though, the narrow bore tips smooth out the middle treble, making it sound better. Fit and seal are much easier to achieve with the narrow-bore tips for me.
Either way, sub-bass rolls off with both, but less with the narrow-bore tips.
Resolution etc. are good for the price, but I see them below the M3, although a bit above the R3 and also above the Jive, although the Jive's midrange may appear to be better resolving due to his somewhat present emphasis, but the S3 reveals more details in the mids. Bass is more arid than the M3's, however S3's lows are a bit less detailed.
More impressions to follow in my reviews.