Pretty sure it was Page and JPJ who said no. I think it was mid/late 69 at a show in California where Bonham set up two bass drums and after the show they all agreed there was just way too much going on there.I recall a tale from back in the day that Bonzo wanted a double bass drum rig, Like Mooney and Ginger, et al, and Peter Grant said something to the effect "bollocks, you can do more with one than they can do with two". True or not, who knows, but I have to agree with Peter...