I have an xtreme 2 and it's a very convenient and enjoyable device.

My pet-peeve is that when I bought it, its sound-signature was very close to my JBL studio monitors. I was astounded by the quality. It could give you goose-bumps.

Unfortunately people started complaining that it does not have enough bass and with every firmware update since then, JBL increases the bass response and destroys everything else.

There is no way to downgrade the firmware. It's still a good speaker but nowhere near what it can do when tuned for fidelity instead of bass. :(