Re-amping is a production technique that is both a creative method to create new bass sounds, as well as a way to bring new life to a bass track that might be letting down the rest of your mix.
Bass signals are often captured using Direct Inject (DI) input method into a recording console or Digital Audio Workstation (DAW). The practice of re-amping involves taking the already recorded signal and route it back out of a console or DAW, running it through external processing, before returning the processed signal into the editing or mixing environment used.
As bass is often recorded dry without any amplification or processing, re-amping provides opportunity to alter the audio signal to improve character, tone and body. Bass is often a driving force in a song, so the practice of re-amping it gives opportunity to add musical energy and improve structure and definition in a track.
Bass signals can be processed through different types of amplifiers, speakers and effects units in addition to introducing other audio effects such as distortion, sonic filters, compression and harsh EQ for creative effects. Common re-amping objectives may include musically motivated amplifier distortion, capturing room tone and resonance, applying effects and adding depth to stereo imaging.
This type of audio signal processing has very few boundaries: it can be used to both improve quality and musicality of any instrument track, as well as for creative processing and modifying tone.