Check the listing for details. QSC AD-MR4 Mud Ring FOR AD-C4T Ceiling Mount Speaker Quantity of 6 New. Color: Silver, Condition: New. Listed at 79.95 USD. Enhance the sound quality of your QSC AD-C4T ceiling mount speaker with this set of six QSC AD-MR4 Mud Rings. These rings are designed to provide a perfect seal for your speakers, ensuring clear and powerful sound without any vibrations or interference. They are compatible with QSC brand and easy to install, making them a great addition to any pro audio equipment setup. Ideal for use in speakers, these mud rings are a must-have for any professional musician or sound engineer. They provide a stable and secure base for your speakers, ensuring that they remain in place and function optimally. Whether you're a QSC brand enthusiast or simply looking for a high-quality mud ring, this product is sure to meet your needs.