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Thanks so much NGY for your help - legend.

Thanks a lot for your reply NGY. So my suspicion was right - rca's not amplified, hence no sound. Something like this do the trick? Maybe even two of them? https://www.ebay.com.au/itm/2-1-Channels-400W-Hi-Fi-Auto-Stereo-12V-Car-Audio-Amplifier-MP3-Radio-Booster-T5/193742212125?_trkparms=aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D230925%26meid%3Dc02acf726e9549d1b1a07e268bf06529%26pid%3D101195%26rk%3D6%26rkt%3D12%26mehot%3Dco%26sd%3D393143632209%26itm%3D193742212125%26pmt%3D1%26noa%3D0%26pg%3D2047675%26algv%3DSimplAMLv9PairwiseUnbiasedWeb&_trksid=p2047675.c101195.m1851

Hi I bought a caravan with a Sony MEX-N4150BT in it, connected to some outdoor house speakers. Not the latest and greatest I know, but it's what I've got. I have bought some Sony subwoofers - they are from a home entertainment system. I spliced them into the existing speaker wiring to see if it would work, and it does! But it's not very 'bassy'. I noticed there are also 4 RCA plugs on the other side which, on reading the manual, seem to be for subs. Can I plug them in here? I've tried, but they don't work. Not sure if there's s software setting I can't find, or if I need an amp to use the plugs on that side (the others come out of the other side). Any help and advice would be very much appreciated. Thanks!