The pdf manual is identical to the one that came with the XPRE. It does not list those as speakers. Why, I don't know.
If the speakers were supposed to be that good, you would think that Moto would point out that there are 2 of them.
The posted jpg looks basically like the XPRE I have
I'm usually more interested in how fast apps will open than sound, so I don't pay too much attention to the speakers unless they are driving me nuts as with a Galaxy Tab 4. I had to buy an external speaker just to hear the announcers at a baseball game and you have to keep checking that disclaimer about loud sound. (BTW, I think that's MLB rather than Android. It will do the same on a Roku)
I haven't seen that on the Moto yet, but there are times that something damps the sound on ringtones. I use a holster, and I need to hear it over outside and car noises. Some women carry these huge bags with the phone just tossed in and they can't find the phone if they even hear it ring.