So, the HTC 10 has two loudspeakers after all, but they are not for stereo
Unfortunately, yes, the stereo front-firing concept is not present on the HTC 10, but the phone does utilize two speakers. Its earpiece doubles as one of the loudspeakers, while the other one is found tucked away on the bottom of the handset. Naturally, such an assymetrical placement can't possibly have the two speakers sounding identical, so HTC chose to capitalize on the differences. The bottom speaker is used more as a sub-woofer, which makes sense, seeing as bottom-mounted drivers can usually be bigger and bassier. The earpiece is tuned to sound off in the higher frequency-spectrum. HTC calls this system “BoomSound Hi-Fi edition”.
So that's settled then — the phone may not have true stereo, but just might be the best-sounding handset of 2016, if what HTC says about the new speakers is true. We are also very curious how that would sound when the phone is turned in landscape mode – would it annoy the listener? We'll have to get our hands on a unit and test it, of course. A little fun fact on the side — we do remember a time when HTC made fun of a certain phone for having its speaker on the bottom, it can be seen in the video below.
Another interesting addition to the phone's sound system is a software audio profiler. Basically, you will be able to run a series of hearing tests with the phone for it to “learn” how well you can hear different frequency spectrums — this is unique for every human, of course. Then, the device will be able to use that profile to fine-tune a personalized EQ, boosting frequencies and cutting others where needed, so that you would, theoretically, be able to enjoy a more “natural” sound.