As a prowd owner and player of a old plywood bass, I've always had a hard time micing the thing. I find that the room sound plays more of a role than most things I need to mic.
One thing to try is something like a player's perspective, a small or medium diaghragm condenser (I like the groove tubes gt44) pointing towards the bridge from in front of the fretboard, at about the 2nd position. If you're playing on a reflective floor, this probably won't work well.
I've also had luck in some cases with the mic in front of the bridge as Reuben mentioned.