The Aphex 602B was one of the first acclaimed harmonics processors, built on the foundation of the company's previous model 402. The 602B is an all-discrete dual-channel harmonics processor from the mid 1970s. Throughout the years, it has found its way onto countless chart-topping records and world-class studios.

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.

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