this model doesn't have pre-outs (except for subwoofer and zone 2,) and it doesn't have analog 7.1 input as well. not sure if it has built-in manual eq, but if it did it would only be a basic 5-band eq.
it's possible to connect this to an equalizer using line-out converter, but that would require the use of external amplification.
if you're planning to tune the sound via equalization with this receiver, i suggest you make the adjustments at the source instead if possible. for example, you can use the eq options on the playback software or audio device when using a PC, or insert an equalizer between the source and receiver (only for analog stereo connection)