what are the best competition subwoofers

{"cid":"91195403","title":"Professional Competition Car Subwoofers 18 Inch Excellent Sound Effect","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/a9\/b5\/933b07361173daa17737d1eb987e-200x200-1.jpg","attrs":{"Price":"Negotionation","Brand Name":"CR AUDIO","Model Number":"18CR","Minimum Order Quantity":"Negotionation","Delivery Time":"45days aft receipt the deposits","Certification":"CE","Place of Origin":"CHINA","Payment Terms":"Western Union, MoneyGram, T\/T, L\/C","Supply Ability":"50000PCS per month","Packaging Details":"carton","Coil":"4\"","Impendance":"8OHM","Frequency Response":"28-2.5khz","SIZE":"18\"","Name":"1000 watt rms subwoofer","Sensitivity":"98dB"}}

{"cid":"90110120","title":"2.0 passive speaker with fashionable design and competitive price ,speaker,subwoofer speaker","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/d0\/6a\/ff66898c764125c00b912a35dd37-200x200-1.jpg","attrs":{"Minimum Order Quantity":"500 Set\/Sets","Delivery Time":"25~30days after receive the deposit","Channels":"2.0","Special Feature":"Wireless System","color":"red","Packaging Details":"paper carton with foam protected","Payment Terms":"T\/T","Supply Ability":"80000 Set\/Sets per Month"}}