The Aphex 2-Channel Audio Enhancer Aural Exciter is a rack mountable unit designed for enhancing audio with its analog harmonic enhancement capabilities. It features a variety of input/output ports including TRS 1/4" and XLR, catering to different equipment setups. With a maximum sampling rate of Type B, this unit from Aphex offers active excitation for achieving rich and dynamic sound in a professional audio setting. Made in the United States, this gray-colored unit delivers two channels of audio enhancement, making it an ideal choice for musicians and audio engineers looking to elevate their sound quality.