i have an eb with 2 10in subs now if i put the subs right at the boot and have the subs facing the boot i get great bass the minute i move the box in any direction or move it under the parcel shelf i lose the bass .... all i want to be able to do is have the box right up under the parcel self ... this isnt the first car it has done it in ... in my xd it was great but now its s**t .. any help would be greatly appreciated

cheers