Aphex 204 Aural Exciter with Optical Big Bottom 2-Channel Rackmount Signal Processor

This Aphex Systems Model 204 Aural Exciter with Optical Big Bottom is a professional 2-channel audio signal processor designed to enhance clarity, presence, and low-end response in live sound, broadcasting, or studio environments. The unit features independent controls for Channel 1 and Channel 2, including Drive, Tune, Mix, and Harmonics adjustments, along with process in/out switches. The rear panel provides balanced XLR and 1/4" TRS inputs and outputs for flexible connectivity with standard audio gear, alongside selectable operating level switches (-10 dBV / +4 dBu). The unit powers on and the chassis shows light cosmetic surface wear, scuffs, and dusting consistent with regular studio use and handling.