[mikethedruid]

You can certainly change part #23 to a .01 condenser with no real ill effects. What it will do is cut down the higher frequency tones, cut the treble. It won't actually increase the bass. You can give it a try, and see how you like the sound. I would try the chassis on the case first, and see how that sounds. If you still want more bass sound relative to the treble, then change it, but realize you will lose some of the brightness of the highs.