HearClear is a Motorola trade mark proprietary feature, and only Motorola radios have it.
Kenwood has a compandor, but just like all compandoring schemes, including HearClear, it sucks, and isn't compatible with any other bands. Turn it off.
Also, the NX3700's are a low-mid-tier radio, and comparing it to a 5300 is not a good comparison. To compare to a 5300, start with a NX5000 or better yet, a VM5000/6000 series.