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Adaptive Bass Linearisation (ABL)
ABL is a Bang & Olufsen patented solution basically to get more bass in small spaces. It is a solution where we make use of the surplus capacity in the built-in amplifiers and driver units at normal listening levels, for a bass extension. With this, we get more bass than the loudspeaker would otherwise be able to produce. However, this solution entails a risk that the driver unit might not be able to handle the extra boosts at higher volume levels. To solve this, we have introduced an electric circuit to monitor the sound level, so when the music peaks in the lower frequency areas and maybe come close to distorting the sound quality or damaging the driver unit, the bass signal is reduced accordingly.
Bang & Olufsen developed Adaptive Bass Linearisation for high-end speakers like BeoLab 9, building a reputation for big and authoritative sound from relatively small speaker cabinets.