I was pretty happy with the 6S speaker. But with stereo in the iPhone 7 I was expecting a little louder sound. Playing back podcasts I'm kinda disappointed. It seems to be no louder, maybe even quieter, than the 6S. The left speaker is definitely lower, assuming because they are using the phone earpiece. And the balance of sound seems off because both speakers are not at even levels. What's going on? Have you experienced the same?