HT receivers are totally different creatures from the old stereo units you are probably used to.
You need to connect it between the preamp outputs and the main amp inputs.
How many channels do you want to eq? Most likely the equalizers you are thinking of are only two channel units, and HT entails at least five, maybe more, channels.
Or, if you want to use it with only one analog source, say a CD player's analog output, you could connect it between the CD player andthe receiver's input.