Need help setting up DB Dynamics Sub with Sony MHC S7AV Hi-Fi System

[Emjames]

So I bought a Hi-Fi system second hand a few weeks ago and bought some speaker wires to hook up the two Sony speakers that came with it. Speakers are fantastic but the sub that came with it is not putting out any bass,

The sub has a white and red RCA connection on the back and the receiver has one black RCA connection called Subwoofer Out. I am using an RCA cable with the white/left end in the receiver's sub out port and the white/left end in the white/left port in the sub.

I have tried using the red/right end of the cable and even using it with both ends in the sub to no avail. The guy I bought it off said it works when watching DVDs but not with music through AUX. I have done a bit of searching and it appears that if it works with DVDs there should be a setting to make it work with music but I can't figure it out. I read about changing the speaker size in the settings but there is no such option with my system. It's a sub with a power cable by the way.

 

[americanaudiophile]

Does it work with the DVD? If not then since the sub is self powered you can test it by connecting any source to it (doesn't have to be sub out) to see if it works. You might need an adapter if you don't have anything with RCA audio outputs (like a cable box or cd player). If it doesn't work you probably have a bad amp in it.
If it does work with DVD then check the speaker settings and sub level again in the main unit again. If you don't have the owners manual google for it.

 

[Emjames]

I got it working today as I received my RCA to Aux adapter. It was because I was using mic in as aux but now I can use the MD/MiniDisk RCA port it works perfectly. Thanks for your help