Can I make a small subwoofer from 2 no-name 6 inch woofers?

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So I have two pipe speakers as seen here: http://www.diyaudio.com/forums/full-range/272360-pvc-pipe-speakers.html

And I also have two 6 inch woofers from a set of AIWA speakers. I have no specs of them, other than their 6 ohm impedance. But they deliver decent bass and I want to put them to use.
Could I use them both in a sub box to complement the pipes? How can I approximate the dimensions of the box and how should I mount them?
 
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