Just a follow up to say that I am impressed with the feedback from Class-D, Peter Hotchkiss Co-Director emailed offering a full refund. I must say that I am impressed with their customer service and hope that I was sent a rogue batch that were wired incorrectly. Full marks to Class-D. the moral of this tale is, try them, if they don't suit then class-D will take them back, they offer a 14 day return period, can't say better than that! :-)