I've been using Jet Black iPhone 7 Plus for last couple days and have noticed external speaker volume is lower than 6 Plus. I usually set the volume to single bar and was enough to hear keyboard clicks and game audio but with 7 plus I can't hear any of those with single volume. I compared the sounds side by side with 6 plus and 7 plus need 5 bars to produce similar vaolume of 6 plus' single bar. Has anyone noticed similar issue?