i bought some new subwoofers and while im workin on them i think i would like to put a little sealed box under them. (they are free air in my rear deck) can i put a little square box under them and if so where can i buy them and how should i attach them.

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1985 euro 500sel 220k
1981 300sd 278k sold
1979 240d 298k sold
1983 300d 272k sold
1989 chrysler 2.2l Turbo
Leabaron 130k
1991 300e 2.6 (hopefully soon)