the 2500 sounds much better, gets lower and is more efficent.. dj is a good guy but the new hdc shouldn't even compared to the 9500... the hdc vs 3500 is a fair compersion, but the 3500 is a better musical woofer... sq wise from dd its 9100 2500 3500 9500.. the 9100 is top notch, 2500s sound **** fine for the output/price... if you want a musical woofer the 2500 all day.. if you want a spl monster that sounds OK at best the hdc...not the new DD woofers went through a spider change that made them more efficent, so there easier to blow.. my vote with 1200 for MUSIC, 2500 hands down...