Engine noise/Alternator whine

Hi Stevdart Many thanks for your reply but I cant find any references to flat subwoofers by using the search feature?? I would certainly prefer to buy a new subwoofer if I could find one which would fit under the seat rather than try to get a piece of electronics repaired in New York City where the rent and paperwork usually costs about twice the cost of the actual repair. I did try putting the Pyramid suppressor in the area under the seat where the subwoofer went and although it did stop the noise which was created by putting it in the trunk where it is supposed to go, it DID introduce quite a lot of alternator whine which WASN'T present before!!

Thanks anyway: I think I will have to re-post as I cant find any flat powered subwoofer with enclosures which is what I think I need. The Alto looks great but I suspect there isnt any casing made for it: It looks from their publicity as if you have to fit it into small spaces rather than put it under seats?