It does seem strange for sure! It’s making me consider sending them back which I’d rather not do as the sound quality is pretty excellent.
I’ve contacted soundcore, this was their response;
Thank you for reaching out to Anker customer service. So sorry to know you are having problems with SoundCore Motion+ speaker. Be assured, we always stand behind our product.
Regarding the hissing noise,after checking with our engineer, please note if you put the speaker near your ear, you will hear current related hiss as the component in speaker is working after you turn on the speaker even if you don’t play music, and due to this speaker has total output power 30W, so the hiss might be more noticeable than other speaker with small output power. But normally the volume for this noise shall be <= 30dBA at 30 cm distance and it normally will not affect the normal use. For your situation, please let us know the hiss happens when you put the speaker near your ear or it’s very noticeable even if you put the speaker on the desk, you can still hear the hiss?
Regarding the issue of taking about 2/3 seconds for music to start playing, if possible to provide us the firmware version you have? You could get the firmware version via SoundCore App, please see attached screenshot.
Regarding your inquiry about the stereo mode and double volume boost when two are paired together, per the feedback from engineer, please note there’s no way switch as when you have two speakers TWS pairing, the speakers are in stereo mode and double volume boost at the same time.
Looking forward to your reply, and have a wonderful day