Jay:

I just got a pair of the twenty3G and most of the time really love
them. Unfortunately, I now hear things I didn't before (I've been
using 15Ks) which makes me a bit unsettled -- the A&P and I are going
to do research on my engine...

One issue -- a popping sound as I'm taxiing and during takeoff. Don't
hear it again, but every flight so far, popping.

There's also a whine once in a while which I think is the final approach
of the ILS but it's been happening in other locations.

Once it warms up around here, I'll go do more study.