Connecting subwoofer correctly
 

Hello,
Im not very technical but I am trying to learn. I have a new DAB radio and it works well using to small loudspeaker. I want to connect an active Subwoofer I have:

Radio Sony CDX DAB 500U
SUbwoofer Alpine Swe 1000
Wire kit. (RCAs, Yellow battery cable with fuse, black ground cable, Blue-white cabel)



The pix shows what I mean. Is it safe to cut the blue-white cable or should I not?



The yellow battery cable is connected, the black gound cable is gounded and the RCAs are in place. Help much appreciated.Sony manual here talks about remote

https://cimg6.ibsrv.net/gimg/www.car...791eaa5f55.jpg

Blue white from Subwoofer is not connected. So the active Sub is not starting. I have connected car battery (Yellow), RCA (left and Right) and Ground (black cable)
https://cimg7.ibsrv.net/gimg/www.car...d4f31ca4ca.jpg
Should I cut the blue-white from Radio and connect from radio to Subwoofer? The wire to the right is from Sub and has a label on it saying remote
https://cimg8.ibsrv.net/gimg/www.car...2ff7413752.jpg

https://cimg5.ibsrv.net/gimg/www.car...0cd2c2d5e8.jpghttps://cimg6.ibsrv.net/gimg/www.car...74a038b231.jpg
radio backside
https://cimg6.ibsrv.net/gimg/www.car...f9353c0189.jpg
Subwoofer and Radio I need to connect:


SUB and radio