Boom Box sound at lower speeds

[PonyLance]

New 2022 GT vert. Stock. Twice driven. First time noticed faint boom box sound at lower speeds, usually when auto trans is shifting, didn't think much of it. Today went for around town drive (weather finally better) and wife noticed it too. I made an appt with the dealer for a "ride a long" but was wondering if anybody had any ideas or have experienced similar sounds, harmonics? Thanks in advance.

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[PonyLance]

Well, kept my appt at the dealer and would't you know it, was unable to duplicate the sound for the ride along. As I left, it started doing it again. Fortunately, the dealer said just come back when it happens and no appointment necessary. It still does not seem normal.