If there is one word I would use to describe the PT15, it would be 'clean'. They have great clarity, the music is presented in a clear manner.
Bass is neutral, tight sounding and controlled, no bloat. There is just enough low-end for the percussion at the end of the last movement of Shostakovich Symphony 5. According to other people, they do respond well to EQ should you need more.
Mids are articulate sounding, instruments have good timbre, instruments sound natural to me. Very detailed too, listening to a solo violin, the notes being played are very distinct. Background noises such as people shuffling in their seats, musicians breathing can be heard.
Treble is crisp, but not too bright to my ears. For example, the clanging of bells sounds just right to me, it is not dulled down or piercing.
Soundstage has good width and decent depth, if there is one criticism, it is a little forward sounding for my taste but after listening for 1-2 weeks my ears have got used to it now, if it was more laid back then it would be ideal.
Instrument separation is very good. Listening to Carmina Burana, the chorus sections, instead of a single harmony I can actually make out a couple of the individual singers in the chorus. They really excel with chamber music but no slouch with symphonies, listening to Mahler 2, 4, 5, 6 & 9, I feel that the PT15 can handle it well, at least nothing sounds muffled or congested.
Keeping things in perspective, this is a budget earbud and I do not have any experience with high-end, and you may have different expectations than me, but for the money I think they are simply fantastic. I have the DIY Graphene and Moondrop Nameless on my wishlist for a potential upgrade in the future, but I would have no problem sticking with the PT15 for the time being.
Note: Using Xduoo X3 as my source.
