In our reviews, we standardly measure the speaker system to determine whether audiophile users will get their money’s worth with the smartphone—this is also the case with the OnePlus 15T. In the pink noise diagram, the compact OnePlus phone shows that it is one thing above all else: not an audio expert.
The OnePlus phone has significant weaknesses, especially in the sound foundation, the lows. Here, for example, a Samsung Galaxy S26 has significantly more bass to offer. For the mids, the OnePlus 15T presents itself as more balanced; however, our measurement reveals slightly underrepresented highs. Almost all frequency bands are below the median, and the super-tweeters in particular drop off significantly.
At around 82 dB, the OnePlus 15T also reaches only a comparatively low overall volume, accompanied by increased background noise. In our measurements across the entire frequency spectrum, about 86 percent of all tested smartphones are better than the compact OnePlus phone. You can find all measurement data for the OnePlus 15T here. For those interested in a handy Android phone who value clear highs and bass and often use their mobile for sound reinforcement, a Galaxy S26 or Xiaomi 17 is clearly the better alternative.
