because they sound like ****. Just have someone make a sealed box according to specs on the web page for the sub you go with.... I know first hand how difficult It is to find someone who knows how to make good ported boxes.
HU: MVH-289BT - 6k
Front Speakers: TS-D1730C - 15k
Sub: TS-W1211D4 - 12k
Sub AMP: GM-D8601 - 15k
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Total - 48k
Once again above prices are M.R.P and you should be able to source them for cheaper at your local shops. If you go with either of my subwoofer suggestions during installation you will tell the installer to wire the subwoofer in parallel. If he does not know what wiring in parallel means you will find another installer.
I highly suggest going with the 74k M.R.P setup you will be very satisfied with the same or going with the above setup but replacing the MVH-289BT Head Unit with the DEH-X6900BT Head Unit.
