connecting subwoofer to stereo amp

{"title":"Class D Bluetooth 5.0 Amplifier 50W x4 Wireless Amp 4 Channel Mini Integrated Home Audio Stereo Receiver","imgUrl":"https:\/\/img.chinax.com\/nimg\/c6\/9b\/1786f128bbc5b0a51cbabb7d5b23-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"Vistron Audio, support OEM\/ODM","Model Number":"BTA-450","Minimum Order Quantity":"300 pcs","Delivery Time":"40-50 days","Certification":"CE, ROHS, FCC, UL, as your request","Place of Origin":"China","Payment Terms":"T\/T, L\/C, Western Union\uff0cPaypal","Supply Ability":"50000 pcs per month","Packaging Details":"1 piece amplifier in a box, then 6 pcs in a carton.","Item":"Bluetooth 4 ch amplifier","Type":"Wireless Bluetooth audio amplifier","BT version":"Qualcomm BT V5.2, can do custom design","Power":"4 X 50 watts RMS 4ohm","Frequency":"Full range amplifier of 20-20K Hz","Class":"Class D digital audio amplifier","Input":"Bluetooth,coax,3.5MM,Optical,HDMI","Color":"Black, white, silver, grey","OEM":"Yes","Produce":"Professional audio amplifier factory"}}

{"title":"GRANDnavi Universal Marine Stereo Single Din Waterproof Level IPX5 MP3 Multimedia","imgUrl":"https:\/\/img.chinax.com\/nimg\/66\/96\/1b47c47ed0d553d39ceec18d5a64-200x200-1.jpg","attrs":{"Price":"Negotiate","Brand Name":"GRANDnavi","Model Number":"MS-10RV","Minimum Order Quantity":"5","Delivery Time":"7-14days","Certification":"CE,ROHS,FCC","Place of Origin":"China","Payment Terms":"T\/T","Supply Ability":"50000Pcs\/Month","Packaging Details":"Normal Packaging(without logo)\/ Customization Packaging","Waterproof Level":"IPX5","BT":"Support","Radio":"FM\uff0c AM","Function":"Colorful Light","Port":"USB\uff0c Aux In","Amplifiers":"4 *50Watt"}}