has anyone ever used these, or know sumone who has? I found a pair quite cheap for (2) dual 4 subs, are they reputable, or at least good enough to get me through this season in ST "C"

http://www.canadiancaraudio.com/online/attachment.php?attachmentid=792&stc=1&d=1150171872
1109561656398_volfen.JPG

http://www.canadiancaraudio.com/online/attachment.php?attachmentid=793&stc=1&d=1150171872
1112518866917_volfen1.JPG