Anyway, during my lunch break, I walked over to the nearby Radioshack and checked the audio section to see if there was anything I could use to hook up the audio AV cables up to the speakers. The clerk at the counter was a dumbass and didn't know what I was talking about, so it was up to me to figure it out. I needed a part with red and white AV outlets and an outlet for a standard headphone jack. I found an adapter that had the AV outlets, but no headphone outlet, instead it had it's own headphone jack. I needed something that the speakers' jack can plug into, so I bought a coupler as well. This little gold tube has two plugs for standard headphone jacks. I figured that this was worth a shot, so I bought these two items, and drooled at the thought of bass-enhanced stereo sound while I slaved away the rest of my Publix shift (bagging groceries sucks sometimes).
After my shift was over, I drove home and hooked up the PS2's audio AV to the speakers using the stereo to headphone and the jack coupler, leaving the yellow video cable in the RF modulator so I'd get a picture.

To make a long story short, it's pure joy hearing those Raiden explosions with alot of bass. Hell, it even makes a boring game like Gran Turismo 4 a little more exciting because it makes the cars sound more like actual CARS than Japanese weekwackers.
To those still using mono RF-only TVs, free yourselves from the RF adapters' tranney of crappy picture and sound and get yourself an RF Modulator, a Stereo headphone jack converter, a headphone jack coupler, and some computer speakers with a subwoofer. You'll never go back to those crappy RF adapters ever again!

Radioshack rocks in my book.