Anyone else get a soft rattle from the dash area at low speeds?

Doesn't happen on all roads. Grass/gravel is too bumpy and rough, and fresh paved is too smooth. Older paved textured road at around 20-35mph. It's like there's a something in there resonates at a certain vibration and thus the rattle. It's quiet enough that the radio will easily overpower it. But it's there. And I'd just like to know if this is unique to my car or if others get a slight rattle from the dash area.

My issue is I can't remember if the rattle existed before I did the speaker upgrades. So this could be a self inflicted wound but I'm very careful about the work I do. No clips have been broken on any dash facia. Nothing dropped into the dash/vents. I've cleared out the center console trays, removed the glovebox entirely, removed all custom wire runs, taped down and/or secured any dangling wires (such as the unused connectors for the tweeters, or the piston for the glove box which has the potential to rattle since it's not a snug fit). I've had the entire head unit out and can still hear it. So that tells me it's deeper into the dash than I've been.

There's been other rattles:
1. The passenger seat belt harness rattling against the B pillar. Easy fix is I just keep the passenger seat belt buckled at all times.
2. There's also a rattle in my rear right door area (haven't touched the rear doors so that's definitely not self inflicted) that I've compensated with by blocking 0-300hz on the rear door speakers to prevent it from happening. I figure I'll bring it up to the tech before they do the fix for the rear door recall and have them snug everything up extra tight while they're in there.
3. The kick panel in the driver foot well under the steering wheel rattled until I pushed the back end of it up and it kind of clicked into place. Easy fix.

 

Good suggestion, I'll have to check mine next time I'm back in there. Maybe some blue loctite on it will keep it snug for you. Don't use red though, need heat to break red loctite bond.