Check the listing for details. Shure GLXD4R+ Digital Wireless Rackmount Receiver. Condition: New. Listed at 431.00 USD. Half-rack Receiver for Growing GLX-D+ Systems Looking to expand your GLX-D+ wireless system? Then grab an extra GLXD4R+ wireless receiver from Sweetwater. This half-rack wireless receiver offers ultra-clear sound and rock-solid digital dependability. The GLXD4R+ uses Shure’s Dual Band wireless technology that allows you to operate in the 2.4GHz and 5.8GHz bands depending on the environment you’re working in. That may sound complicated, but the GLXD4R+ makes it easy. The receiver manages everything in the background — including assigning and switching to backup channels when needed — so you don’t have to. Plus, the receiver automatically pairs with other Shure GLX-D+ transmitters for a speedy setup. With a Shure GLXD4R+ digital wireless rackmount receiver, you can go wireless without worry.