This acoustic filter uses the same patented technology as the RF-Pro. Its lightweight body and clamp assembly makes the RF-X simple and easy to use. The RF-X is lighter than its predecessors, but still maintains durability. It features a four-layer acoustic filter design comprising the outer composite panel itself, a wool fabric layer, an air gap layer and an inner acoustic foam layer. The air gap ensures that recordings exhibit almost no sound coloration when the RF-X filter is used. The RF-X clamp assembly's lightweight design can be used on almost any microphone stand. It allows vertical mounting only, making it ideal for vocal recording.