Typically there are a minimum of 2 to 3 outputs on a mixer. There is the RECORD OUT, MASTER OUT and the BOOTH OUT on many club mixers.
The REC OUT is used to record your mix. You can connect any device to it such as a tape deck, digital 8-track like my Roland VS880, MP3 recorder/player, or Mini Disc player and so on. The REC OUT has one level and can't be adjusted on most mixers. REC OUT is a stereo mix so it has a LEFT and RIGHT outputs.
DJ Tutorial Tip: Make sure you connect the proper leads to the proper connections on the REC OUT just as you did with the turntable leads to their corresponding inputs.
The MASTER OUT gets connected to the amplifier or to the component that is amplifying the signal. On the back of a stereo receiver there are usually RCA connections. Those RCA connections correspond to a component that gets plugged into it. But there is nothing that says mixer on it. Not to worry. Simply take the MASTER OUT and plug it into the CD if it's not in use or AUX IN of the stereo receiver.
If you have an amplifier like the Peavey PV900 Power Amp take a look at the rear connections. Chances are you don't see an RCA connection on it. You probably see a QUARTER INCH jack on it. If this is the case on your amplifier then you need and RCA to QUARTER INCH cable.
Plug your RCA end of the cable into the MASTER OUT and the QUARTER INCH end into the QUARTER INCH input of the amplifier making sure you plug the LEFT MASTER OUT of the mixer into the LEFT QUARTER INCH in on the amplifier. Do the same with the RIGHT MASTER OUT.
DJ Tutorial Tip: If you are using powered speaker then connect use the proper cables such as RCA to RCA or RCA to QUATER INCH. Chances are it is an RCA to RCA. Connect your mixers MASTER OUT to the RCA INPUT or QUARTER INCH input if it has one, of the powered speakers.