A:Answer While we do not have information regarding the diameter of the subwoofer, the dimensions of the subwoofer are: (WxHxD) 6.7" x 15.4" x 10.3". We hope this information helps. If you are in need of any assistance, have additional questions, or would just like to see our helpful tips, check us out on Twitter @LGUSSupport or you can give us a call at 800-243-0000. ^CP