I have listened to the 3.7i's with upscale Rel subs, and it sounded wonderful. Another choice of subs would be Vandersteen Sub 3's. Although they take a bit more ambitious amount of implementation.
magnapans.7i and subs
so i am looking to ad in a couple subs. my magnapan dealer likes paradigm subs and has suggested the defiance x10 specifically. upon reading about this sub it is ported. i have always assumed sealed subs are suited better for 2 channel listening. just wondering if anyone has this setup or has experience with this particular sub