I just got home and tested the following variations:
1. ps2 to OSSC using component: audio static/hiss noise still exists
2. SNES to OSSC using component: clean audio, no static, no hissing
My guess is that the ps2 slim’s audio output is noisy, but if I attach the ps2 directly to the Samsung TV’s component, there is no audio static or hiss. Maybe the TV has a low pass filter?