After a few days of listening to the B1 shows that the sound is better when played through my computer vs the iPhone. This apparently is because the computer (Windows 10) has the latest Bluetooth drivers to allow activation of the Aptx mode in the B1. I believe the Aptx is the High Definition mode of Bluetooth or uncompresses the signal better. Nonetheless the sound seems more 3-dimensional when Aptx is on. The iPhone doesn't activate the Aptx mode. I'm not sure if there is a way to update a driver on an iPhone. It's an iPhone 7. In the meantime I'll listen via my computer saving me the effort of leaving the iPhone on the charger.