how to build a subwoofer box

{"cid":"91200563","title":"High Definition Bluetooth PCB Assembly Digital Subwoofer Amplifier Board","imgUrl":"https:\/\/img.chinax.com\/nimg\/8c\/6d\/8835d4b8484d34680938eef050e3-200x200-1.jpg","attrs":{"Price":"Negotiation","Brand Name":"BQZYX+","Model Number":"ZYX-2173EIJN","Minimum Order Quantity":"1pcs","Delivery Time":"5-8 work days","Certification":"FCC","Place of Origin":"China","Payment Terms":"T\/T, D\/A, D\/P, Western Union","Supply Ability":"150000 Pieces per Month","Packaging Details":"Electrostatic bag","Output power":"100W*2","Input voltage":"DC12-24V","Audio input":"Bluetooth, TF card, AUX","Appearance size":"96*86*20mm","Board Thickness":"2.0mm","Copper thickness":"1\/2OZ 1OZ 2OZ 3OZ"}}

{"cid":"91222424","title":"PCBA Consumer Electronics Soundbar With Subwoofer SMT Printed Circuit Board Assembly","imgUrl":"https:\/\/img.chinax.com\/nimg\/97\/3d\/94648dd5813e8e5313cdf7643b04-200x200-1.jpg","attrs":{"Price":"USD 1.99 ~ USD9.99\/pcs","Brand Name":"TECircuit","Model Number":"TEC0411","Minimum Order Quantity":"1pcs for sample, 100pcs for bulk","Delivery Time":"5-15 wotk days","Certification":"UL,ISO 9001, ISO 14001, ISO 13485, ITAF 16949, ROHS,REACH","Place of Origin":"China","Payment Terms":"L\/C, D\/A, D\/P, T\/T, Western Union, ","Supply Ability":"50000 pcs\/month","Packaging Details":"Vacuum package+Carton box","Brand":"Shenzhen Tecircuit Electronics Co., Ltd","Product Type":"PCB,High frequency board,RIGID PCB,Rigid board,Flexible board,Rigid-Flex PCB,IC-Substrate,Metal Core","Item No.":"PCBA0271","Service":"PCBA service"}}