Moto E 2nd Gen speaker vs. Moto E 1st Gen

I am transitioning from a 1st Gen Moto E to a 2nd Gen Moto E. Having the two side by side, I've noticed that the 2nd Gen Moto E's speaker is slightly more tinny for notifications and ringing. It's enough to bug me, but not enough to say that it's definitely a defective speaker, as it works.

Is this just the way it is or should I look into swapping the phone? Any other observations about the speaker on both models?

Thanks.