i've installed 1601As in an 825/828 homebrew box that used to house 515Bs...
i've been told that it helps to add a cork gasket or something, between the driver face and the rear of the baffle -- to keep the cone from slapping the cabinet... if you drive them hard...
i've not experienced this issue personally, even though I did not have the gasket installed when I had the 825s in the house.... but i did not listen at crazy levels either...