The RS 10 which features dual stacked nomex spiders and a 100 oz motor. The RS Series is rated 500 watts rms / 1000 watts peak. Even though this is our entry line, they will surely exceed your expectations for their performance and muscial quality! SPECS RMS:500 Voice Coil: 2.5" Motor:100 Oz SPL: 84.5 db FMS: 31.4 Hz BL: 25.6 RES: 82.2 RE: 8.0 QMS: 4.38 QES: 0.40 QTS: 0.36 CMS: 0.16 mm/N MMS: 164.6 gr Nref: 0.18% BT: 25.6 VAS: 23.8 L RP: 90.6 LP: 116.5 mH CP: 300.8 uF Le: 3.66 mH