connecting subwoofer to stereo amp

{"title":"GRANDnavi Universal Marine Stereo Single Din Waterproof Level IPX5 MP3 Multimedia","imgUrl":"https:\/\/img.silkroadsl.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"}}

{"title":"Pro Audio Bluetooth Amplifier 50W x2 Wireless Amp 2 Channel Class D Integrated Stereo Receiver for Passive Speakers","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/da\/61\/e5dffb473f7ec530c86f7a3d5be7-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"OEM","Model Number":"BTA-250 White","Minimum Order Quantity":"300 pcs","Delivery Time":"45 days","Certification":"CE,ROHS, FCC,ETL","Place of Origin":"China","Payment Terms":"T\/T, L\/C, Western Union","Supply Ability":"80000 pcs per month","Packaging Details":"1 piece Bluetooth amplifier in a giftbox, 6 pcs in a carton","Item":"Bluetooth power amplifier","Power":"2x50W RMS","Channel":"2 channel stereo amplifier","Type":"Class D HIFI Amplifier","Usage":"Stereo Receiver for Passive Speakers","Inputs":"Bluetooth, Optical, HDMI, AUX, COAX","Frequency":"20-20K HZ","OEM":"Yes"}}