No. It sounds like you might be pushing the bass level beyond max causing the signal to clip. If you boost any frequency range without a corresponding reduction in overall gain, this can happen. So a +3db bass boost should include a -3db preamp gain or clipping can occur.
I recommend staying away from the graphic EQ in SoundSource anyway. The parametric EQ is where it’s at. Start with the built-in Headphone EQ, like @InvisibleInk is doing for his Sennheiser HD 58X. Those are parametric EQ presets from AutoEQ. If you think those are going in the right direction, then use SoundSource’s custom profiles for Headphone EQ using oratory1990’s presets (see how oratory1990 includes a negative value for preamp gain in his presets?). Or as an alternative, create a custom profile using the profiles you can find in this forum like Chrono’s. Either way, use that as a starting point and tune to your taste.