A slashdot user called Kragen tried to attract my attention in the public forums, but was modded down and I thus didn't see his message for ages). Since his e-mail is hidden (as is mine), but there is no way to privately message another slashdot user, here is the best place I can think of to get his attention.
I went back on my initial Hypersound Car review. You can see my updated response in the review pages on amazon.co.uk,
or in the yakumo forums at: