Re-reading your question, can you connect the "harman/kardon EQ8 '80s-vintage 10-band" via standard RCA audio inputs? If so, then are you certain the vintage device does not ADD hiss or noise to the signal? I have an old 80s stereo, and it's known to sometimes add in noise -- making it a poor fit for my LP conversion work.
I had to upgrade to a nicer turntable two years ago, and then later bought the audio board that I cart between it and the video setup, as needed. Computer serves as recorder, although that can sometimes add noise too -- took a while to get a "noise free" setup, no feedback from other cards or devices inside the tower. Better card, too (Turtle Beach).
Get back to me on all that. Let's see what you've got available!
