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The lower bass is usually sitting on an low pole filter, and the upper one off of a band/high pass (or derivative). Note placement really depends on the effect that you are looking for out of the oscillator that is being played at a lower pitch. Compression also plays a role in how the entire bass will sound, depending on the dynamics.
Sometimes I have two or maybe three multi-oscillator synths taking on the role of bass. The sub-low bass takes on the lowest octive, and the secondary and tetriary basses "Can" take on an octive above, but have NEVER gone below the initial "sub" bassline (nothing ventures lower than the basement).
You should be mindful of which octives/frequencies are emphasized in your total bassline, and turn down volumes of oscillators/synths depending on the lows, mids, and highs that you want. Do this BEFORE you EQ the heck out of the bass, and you will not have to repair something that isn't broken already.
I could try to tell you specifics that fall into the place of filter settings, volume settings and EQ, but it has NEVER been set in stone for me. You must know the effect that you are looking for. I am not a professional, but I hear that most basses sound the "phattest" in the G (sharp of flat?) key if you are going to sample it to rescue your CPU.
Bear in mind, however, that not all basses are specifically layered. Layering is a powerful tool, but my tactics must be revised if you are having a mix dependent on merely on one synthesizer thumping a bassline away.
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...On college-driven hiatus...
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