Welding is simple , once you've made a jig //content.invisioncic.com/y282845/emoticons/up2something.gif.dd110ecf3ae4b76050d87598f2f8de7c.gif There seems to be a LOT of interest in that Boston sub ...... guys , I can NOT tell you how good it is. I bought three for my car , and found I only needed ONE. It would have been just stupid loud with more than one of them. I still have the extra two I bought for sale BTW ... , but will ONLY discuss it in a PMDid you weld that together yourself?