Yeah its the magnet that messes up the works. I dont know that you can get any high end speaker in there without a ton of spacing. Now maybe with neodymium magnets it can be done. I know Boston Acoustics is using them on a few of their component sets but I dont know of any top shelf car audio speakers using them yet. Been out of the car stereo game for a while though so there might be more shallow fitting systems than I know of.