RCA to Phono plug question

[Reaper3Bravo]

Had a gig last night that was a bust. The only way to connect is via a phono port. I got an RCA to male headphone cable and put the big phono adapter on and plugged in. The sound wasnt right it. How can i fix this. I shut down, restarted and tweaked the cables a little with no luck.

Thanks

serato w/mixtrack pro 2

[soundinmotiondj]

If this is REALLY an input for a phono-graph...there is nothing you can do. That input is designed to take the input from a turntable.

http://en.wikipedia.org/wiki/RIAA_equalization

You need to get an input that will take a "line" level signal.