If you have an line level RCA audio output it should work fine into any aux input. If the aux input has a 3.5mm stereo mini jack then you will need a cable with 2 RCA at one end and the stereo mini plug at the other. They also make adapters if you already have a cable you want to use.
What is AUX input RCA?
An AUX jack can be a pair of RCA inputs or a 3.5 mm Stereo jack. It allows you to connect an analog output to the sound system. That analog output may come from a phone, iPod, tape deck or CD player. The AUX output of a phone is about 1 volt at full volume where a CD player is 2 volts.
Can RCA plug into 3.5 mm?
You can successfully connect any 3.5mm audio source and any RCA audio source, be it mono or stereo/male or female. They pass thru the same signal type, its just a different plug.
Is RCA and AUX same?
There is nothing that is specifically an "auxiliary cable" (for audio.) AUX usually refers to the Aux inputs to a home stereo receiver which are a selectable input source whose connectors are usually on the rear of the receiver. Home stereos use standard RCA connectors and cables for this.