The company Electronize refunded my payment and said that because of a 'Security' issue that they could not sell me the speed controllers, and could not accept any future orders as a result; nothing to do with the house this time. The reason I keep asking all the questions Is that I have already had one attempt at buying the parts and got it VERY wrong. I do have a sabertooth already but its the 2x12 version, though it has run fine in testing for the past 9 months.