ok i have an alpine mrd 605 amp, like this ...http://cgi.ebay.com/Alpine-MRD-M605-605-600W-MONO-SUB-WOOFER-AMP-V12-New_W0QQitemZ140025306807QQihZ004QQcategoryZ79825QQrdZ1QQcmdZViewItem and a sealed box 1.92 cu ft a piece waht would be the best subs to put in, im completly open to any suggestions