Phase controlled subwoofers

Phase adjustment

— this adjustment allows you to shift the sound from the subwoofer in phase relative to the main acoustics — in most cases by 180 °, but there are models with adjustment by 90 °. Out-of-phase can occur for various reasons (from differences in distance to the "inconsistency" of individual electronic components), but anyway it significantly degrades the quality of the bass. Phase adjustment eliminates this phenomenon.