One of my friend's wants to sell this to me:
Rockford Punch Z 12" Single-Voice Coil 8-Ohm Subwoofer with Polypropylene Cone :
Band pass box with plexi front window:
Another friend told me:
Don't expect very good sound quality with a prefab bandpass box like that though.
it usually accentuates a certain frequency and makes it sound "boomy" If you are going for sound quality at all, you would be much better getting a sealed or ported box, or a properly designed bandpass design.
the Basslink would sound quite a bit better IMO. But your friend's setup would most likely be louder.
Does anyone else know about prefab bandpass boxes?