this type of device processes an audio signal to improve the sound and definition. Early enhancers where known as “aural exciters” and boosted a harmonic element in the music to produce a brighter effect. Other systems use phase correction to place signals precisely in phase so that frequencies are not lost as a result of phase cancellation.

DNA sequences that can greatly increase the transcription rates of genes even though they may be far upstream or downstream from the promoter they stimulate.