This Aphex 204 Aural Exciter Optical Big Bottom is a excellent addition to any studio setup. It features two channels with XLR input/output ports and is a 1U rack mountable form factor. The gray color and sleek design make it a great addition to any setup. This exciter/enhancer has a harmonic enhancement feature and an active equalizer to enhance your sound. It is a high-quality analog device that is perfect for any music enthusiast. Made in the United States, this Aphex 204 is a reliable and durable piece of equipment that will enhance your sound to the next level.