The Aphex 104 Aural Exciter is a harmonics processor which enhances clarity and intelligibility through the use of phase shifting and by synthesizing harmonics of the incoming signal. The resulting signal is perceived as being louder than the original and the unit achieves this without a noticeable increase in peak output.
The Aural Exciter is said to enhance clarity and intelligibility by adding phase shift and musically related synthesized harmonics to audio signals. The Big Bottom circuit combines a low-pass filter and dynamics processor to compress and delay incoming low-frequency information. The process is reverse amplitude dependent, meaning that more is applied as the input level drops and less as the signal gets hotter. Together the dynamics processor and time delay create sustained bass frequencies that are perceived as being louder yet do not noticeably increase peak output.
Aphex started selling the professional units, and introduced two low-cost models: Type B and Type C. The Aural Exciter circuit is now licensed by a growing list of manufacturers, including Yamaha, MacKenzie, Gentner, Emu, Dean Guitar and Bogen. The so-called Big Bottom circuit was added in 1992. Later revisions of the Aphex Aural Exciter included the Model 104 Type C and Type C2 units. The most recent version is the Model EXCITER Aural Exciter and Optical Big Bottom.
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