I haven't had the single shot, but I have had the ATR dual with PitBull muffs, and currently have Cottons dual with Walker Ultraflow.
The ATR still has a bit of a drone, but nothing seriously irritating, IMO, just kinda a grumble. Fit was good, though it touched the floorboard after the cat and some "persuading" was necessary to keep it from touching.
The Cotton/Ultraflow has virtually no drone, and fit was excellent, even though it was a 2.75" dual (no longer available, I believe). Folks who have been in my car are surprised by how quiet it is.
HTH