Rick Beato demonstrates a common phase problem that comes up whenever you record bass through both a DI and a miked amp at the same time. Using a Fender Jazz bass split through a Little Labs box into a Neve 1073 and an Ampeg combo, he records both signals simultaneously in Pro Tools and shows how the amp track consistently sits slightly behind the DI at the transient.
He walks through two solutions: the old-school approach of adding a delay to the DI to push it back in time, and the more direct method of simply sliding the amp track forward until the waveforms align. Both get to the same result, a tighter, fuller bass sound where the DI clarity and amp weight reinforce each other instead of smearing.
The key takeaway: when blending DI and amp on bass, always check phase visually at the transient, not just by ear. A small nudge in your DAW is all it takes to get a bass that sits with real weight in the mix.