6 inch subs

Got 4 of these sub's. when all 4 are thump n and humin they are awesume ,,,wife and neighbors can hear 4 house's down widows closed !!! Good sound, good quality.(thick voice coil wire not like cheapy's. FYI have 2 each wired parallel ( pos 2 pos on both speakers same for neg 2 neg for both speakers hooked up to 100 rms at 2ohm stereo very nice bass vibrates whole truck used 3rd and 4th channel for 8 inch sub mono nice bass on bottom review mirror moves and fuse panel pop out! Also if yr building system have 4 sony explod's in front pioneer 4 ch at 50 rms very nice sound,,used the head unit ( 20rms)to hook up 4 tweeters rated at 25 watts all hooked up in single cab toyota!!!!! waiting for hearing to come back after major jam session ; )