Preset 4 is the default (it was chosen because it, like preset 5, applies no contour settings); this preset uses the EQ settings without any additional adjustment. The only presets that alter the EQ settings at all by default are 1 and 3 (1 has a 5dB boost at 35Hz and 3 has a 3dB boost at 55Hz - see contour settings on the System Settings screen). Preset 6 bypasses the EQ settings completely and is the same thing as not having the SMS-1 at all.

To see what the Self-EQ did, press "1-2-3-4-5" to access the System Response screen. That'll start the frequency response sweep going (which will also draw your response curve if the mic's connected). It will also show you the current settings of the eight EQ channels. If you want, you can run the "Auto-EQ" (which is subtly different from the "Self-EQ" that you triggered by pressing "3-2-1") by moving the cursor down to "EQ MODE" and changing it from "MANUAL" to "AUTO." This will activate the "Auto-EQ" mode, which uses the EQ output ("Self-EQ" sends a test signal straight to the sub rather than the EQ output) and performs twice as many sweeps to dial in the sub. You may see somewhat different EQ settings after this process.