The sE Electronics Reflexion Filter X gives you access to sE's patented acoustic filter technology at an incredibly affordable price. For the RF-X, sE developed new materials that are lightweight yet rugged enough to stand up to the most demanding work environments. An outer composite panel, a wool fabric layer, an air gap layer, and an inner acoustic foam layer form a unique, 4-layer design that imparts near-zero sonic coloration to your tracks. At Sweetwater, when we want to get great-sounding recordings without breaking the bank, we reach for the sE Electronics Reflexion Filter X.