i bought a set of the two 15's, there supposed to be pretty decent just not that great of low-end extension they however are good for about 1500 rms and on the great 12 challenge with 3000 watts they burped at around 144 for a 12. pretty decent woofer with ok sq is the rap on them. but pierce audio will take care of you and anytime i have questions i go directly to john pierce and he always takes care of me. i would give you a thumbs up on the WMD but dont expect super loud lows